JP2012018101A - Strain gauge for measuring hot spot stress and sensor device for measuring hot spot stress - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strain gauge for simply and accurately measuring a hot spot stress, capable of easy positioning and sticking with enhanced workability.SOLUTION: A strain gauge 1 for measuring a hot spot stress has a gauge pattern 12 comprising a gauge base 11, a first grid part GA, and a second grid part GB. The first grid part GA having a gauge resistance Rga is arranged at a first predetermined distance DA in the longitudinal direction from one end LE of the gauge base 11 in longitudinal direction, and the second grid part GB having a gauge resistance Rgb is arranged at a second predetermined distance DB from the one end LE longer than the first predetermined distance DA. A bridge adapter 2 has a first fixed resistance R1, a second fixed resistance R2, and a third fixed resistance R3, which constitute a bridge circuit with the gauge resistances Rga and Rgb. A measuring instrument 3 obtains an output corresponding to a hot spot stress from the bridge adapter 2.

Description

  The present invention relates to a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device for measuring hot spot stress in order to predict a fatigue life of a structure or the like.

Damage due to fatigue in structures such as piers, buildings, and cranes has become a problem, and life prediction of such structures has been regarded as important. In order to examine and grasp the fatigue strength of a structure, it is necessary to grasp the stress at the weld toe where the stress concentration causes damage. Hot spot stress is used to verify the fatigue strength of such a weld toe. In order to obtain the hot spot stress, there is a method of structural mechanical calculation using FEM (Finite Element Method) analysis or the like, but finally, a method of obtaining the hot spot stress by actual measurement should be used. Is required.
As a method for obtaining the hot spot stress by actual measurement, for example, two strain gauges are attached at a predetermined interval from the weld toe, and the hot spot stress is determined by a so-called linear extrapolation method based on the ratio of the stresses at these two points. There is a method for estimating the spot stress, that is, the stress of the weld.
For a method for obtaining this type of hot spot stress, for example, linear extrapolation is described in Non-Patent Document 1 ("Fatigue Design Guidelines for Steel Structures and Explanation", published by Japan Steel Structure Association, pages 283 to 291). It is specifically described as a method using the method. That is, it has been shown that two strain gauges are respectively attached to predetermined locations having different distances from the weld toe, and the hot spot stress is obtained by linear extrapolation from these two stresses. . This non-patent document 1 also describes some proposal examples of the locations where strain gauges are attached to obtain hot spot stress using the linear extrapolation method, and positions where two strain gauges are attached. Are shown to differ depending on the analysis method.

Non-Patent Document 2 ("JWES Joining / Welding Technology Q & A 1000 (No. Q04-2-19)", Japan Welding Association website, http://www-it.jwes.or.jp/qa/details .jsp? pg_no = 0040020190), the stress value at the position of 0.5 times (0.5t) and 1.5 times (1.5t) the plate thickness t from the weld toe to obtain the hot spot stress. Are connected by a straight line, and a method of estimating a stress value extrapolated to the weld toe position (described as SR202B method) is described.
These Non-Patent Documents 1 ("Fatigue Design Guidelines for Steel Structures and Explanations", published by Japan Steel Structure Association, pages 283-291) and Non-Patent Document 2 ("JWES Joining / Welding Technology Q & A 1000 (No. Q04)" -2-19) ”, the website of the Japan Welding Association, http://www-it.jwes.or.jp/qa/details.jsp?pg_no=0040020190), the method disclosed in advance according to the analysis method. When attaching a strain gauge to measure the stress value at the determined location, the strain gauge must be positioned correctly and the strain gauge must be attached to the appropriate position. Work was needed. Moreover, since the hot spot stress is basically calculated based on the measured values at two locations, in order to obtain such hot spot stress, data processing after measurement based on data measured by each strain gauge is performed. The stress had to be calculated and results could not be obtained in real time during the measurement.

  For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-264856) discloses a countermeasure against such a problem. That is, Patent Document 1 (Japanese Patent Laid-Open No. 2009-264856) discloses a gauge base made of a flexible film-like insulator and a first predetermined direction in one predetermined direction from one end of the gauge base in a predetermined direction. A first gauge grid portion that is disposed on the gauge base and that is provided on the gauge base and is made of a gauge resistor that is sensitive to strain in the predetermined direction at the first predetermined distance; and the predetermined direction from the one end of the gauge base A second gauge grid portion disposed on the gauge base at a first predetermined distance and having a gauge resistance sensitive to strain in the predetermined direction at the first predetermined distance; and The first place is disposed on the gauge base and disposed at a first predetermined distance in the predetermined direction from the one end. A third gauge grid portion composed of a gauge resistor that is sensitive to strain in the predetermined direction at a distance, and a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the gauge base. A fourth gauge grid portion disposed on the gauge base and made of a gauge resistance sensitive to strain in the predetermined direction at the second predetermined distance; one end of the first gauge grid portion; and the first One end of the second gauge grid part, the other end of the second gauge grid part and one end of the fourth gauge grid part, and the other end of the fourth gauge grid part and the first 3 is connected to one end of the three gauge grid portions, and the other end of the first gauge grid portion, one end of the first gauge grid portion and the second gauge grid are connected to each other. To connect to one end of the terminal portion, to the other end of the fourth gauge grid portion and one end of the third gauge grid portion, and to the other end of the third gauge grid portion, respectively. 1st, 2nd, 3rd and 4th wiring connection part which forms the conductive path of the above, and the first wiring connection part is connected to one end of the fixed resistor and one end of the bridge input, The second wiring connection is connected to one end of the bridge output, the third wiring connection is connected to the other end of the bridge input, and the fourth wiring connection is connected to the fixed resistor. By connecting to the other end and the other end of the bridge output, positioning and pasting for measuring hot spot stress is easy, high workability, simple and accurate hot spot stress measurement is realized. I was supposed to A strain gauge for measuring spot stress is shown.

JP 2009-264856 A

"Fatigue Design Guidelines for Steel Structures and Explanation", published by Japan Steel Structure Association (pages 283-291) “JWES Joining and Welding Technology Q & A 1000 (No. Q04-2-19)”, Japan Welding Association website, URL (http://www-it.jwes.or.jp/qa/details.jsp?pg_no= 0040020190), 2004

The strain gauge for measuring hot spot stress described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-264856) described above has a larger gauge itself, and the shape and dimensions of an attachment site of a member to be welded that is a target for measuring hot spot stress. However, handling was complicated. In addition, it is necessary to design a gauge for each plate thickness of a member to be welded that is a target of hot spot stress measurement, and it is not easy to prepare a gauge corresponding to all dimensions.
The present invention has been made in view of the above-described circumstances, and is easy to position and mount for measuring hot spot stress, has high workability, and realizes hot spot stress measurement easily and accurately. It is an object of the present invention to provide a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device.
An object of claim 1 of the present invention is to be able to easily perform appropriate alignment for measuring hot spot stress, to improve hot workability, to easily and accurately measure hot spot stress. It is an object of the present invention to provide a strain gauge for measuring hot spot stress.
An object of claim 2 of the present invention is to provide a strain gauge for hot spot stress measurement that can easily obtain hot spot stress directly as a bridge output according to the condition of a member to be welded. is there.

An object of claim 3 of the present invention is to provide a strain gauge for hot spot stress measurement that makes it possible to more easily measure the hot spot stress particularly according to a typical definition.
The purpose of claim 4 of the present invention is to be able to easily perform appropriate alignment for measuring hot spot stress, to improve hot workability, and to easily and accurately measure hot spot stress. It is an object of the present invention to provide a strain gauge for measuring hot spot stress.
The object of the fifth aspect of the present invention is to provide a hot spot stress measuring strain gauge that can easily obtain a hot spot stress as a bridge output with a simple structure and easily according to the condition of a member to be welded. Is to provide.
An object of claim 6 of the present invention is to provide a strain gauge for hot spot stress measurement that makes it possible to more easily measure the hot spot stress according to a typical definition.
An object of claim 7 of the present invention is to provide a hot spot stress measurement sensor device that can measure hot spot stress accurately with a simple configuration and good workability.

The object of claim 8 of the present invention is to be able to easily cope with the situation of various members to be welded with a simple configuration, to improve workability, and to measure hot spot stress accurately. An object of the present invention is to provide a hot spot stress measurement sensor device.
An object of claim 9 of the present invention is a hot spot stress measuring sensor which can cope with the situation of various members to be welded with a simpler configuration and can accurately measure hot spot stress. To provide an apparatus.
The object of the tenth aspect of the present invention is to provide a hot spot stress measurement sensor device capable of individually measuring hot spot stress and stress strain at each predetermined position with a simple configuration. is there.

In order to achieve the above-mentioned object, the strain gauge for hot spot stress measurement according to the present invention described in claim 1
A gauge base made of a film-like insulator having flexibility;
A strain having a first rated resistance value, disposed on the gauge base at a first predetermined distance in the predetermined direction from one end in the predetermined direction of the gauge base, and strain in the predetermined direction A first gauge part for detecting
The second rated resistance value is 1/3 of the first rated resistance value, and is located at a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the gauge base. A second gauge portion that is disposed on the gauge base and detects strain in the predetermined direction;
It is characterized by comprising.

The strain gauge for hot spot stress measurement according to the present invention described in claim 2 is the strain gauge for hot spot stress measurement according to claim 1,
The first gauge portion and the second gauge portion are set in advance to the first predetermined distance and the second predetermined distance corresponding to various plate thicknesses of a member to be welded as a hot spot stress measurement target. This is characterized in that these are prepared and used in accordance with various plate thicknesses of the welded member to be measured.
The strain gauge for hot spot stress measurement according to the present invention described in claim 3 is the strain gauge for hot spot stress measurement according to claim 1 or 2,
The thickness of a member to be welded as a hot spot stress measurement target is T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T.

In order to achieve the above-mentioned object, the strain gauge for hot spot stress measurement according to the present invention described in claim 4 is provided.
A gauge base made of a film-like insulator having flexibility;
It has a first rated resistance value, is placed at a first predetermined distance in the predetermined direction from one end of the predetermined direction of the gauge base, is affixed on the gauge base, and detects strain in the predetermined direction A first gauge to
The second rated resistance value is 1/3 of the first rated resistance value, and is arranged at a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the gauge base. A second gauge for pasting on the gauge base and detecting strain in the predetermined direction;
It is characterized by comprising.
The strain gauge for hot spot stress measurement according to the present invention described in claim 5 is the strain gauge for hot spot stress measurement according to claim 4,
The first gauge and the second gauge are general-purpose uniaxial strain gauges having the first rated resistance value and the second rated resistance value, respectively. It adheres on the said gauge base as said 1st predetermined distance and said 2nd predetermined distance corresponding to various plate | board thickness of the to-be-welded member.

The strain gauge for hot spot stress measurement according to the present invention described in claim 6 is the strain gauge for hot spot stress measurement according to claim 4 or 5,
The thickness of a member to be welded as a hot spot stress measurement target is T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T.
A hot spot stress measurement sensor device according to the present invention described in claim 7 is:
The strain for hot spot stress measurement according to any one of claims 1 to 3, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The first gauge portion is connected to both ends of the first gauge portion and the second gauge portion of the strain gauge for measuring hot spot stress, and one end is connected to one end of the second gauge portion. A first fixed resistor having a resistance value that is 2/3 of the rated resistance value of the portion, one end connected to the other end of the first fixed resistor, and a resistance value equal to the rated resistance value of the first gauge portion A second fixed resistor having one end connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge portion and having a resistance value equal to the rated resistance value of the first gauge portion A first fixed terminal for deriving a connection point between the one end of the first gauge portion and the other end of the third fixed resistor, and the other of the second fixed resistance. A second lead-out end for deriving a connection point between the end and the one end of the third fixed resistor , A third lead terminal for deriving a connection point between the one end of the second fixed resistor and the other end of the first fixed resistor, and each of the first gauge portion and the second gauge portion A fourth derivation terminal that is connected in common to the other end, and a bridge input is supplied between the first derivation terminal and the third derivation terminal; A bridge adapter from which a bridge output corresponding to the hot spot stress is taken out from between the fourth lead-out terminal;
It is characterized by comprising.

The hot spot stress measurement sensor device according to the present invention described in claim 8 is:
The strain for hot spot stress measurement according to any one of claims 4 to 6, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The hot spot stress measurement strain gauge is connected to both ends of the first gauge and the second gauge, one end of which is connected to one end of the second gauge, and the rated resistance of the first gauge. A first fixed resistor having a resistance value 2/3 of the first value, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge A third fixed resistor having one resistance connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge and having a resistance value equal to the rated resistance value of the first gauge A first lead-out terminal for deriving a connection point between the one end of the first gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor A second lead-out terminal for deriving a connection point with the one end of the second end, and the second fixed terminal. A third lead-out terminal for deriving a connection point between the one end of the resistor and the other end of the first fixed resistor; and the other ends of the first gauge and the second gauge are connected in common. A fourth deriving terminal for deriving; a bridge input is supplied between the first deriving terminal and the third deriving terminal; and between the second deriving terminal and the fourth deriving terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
It is characterized by comprising.

In order to achieve the above-mentioned object, the hot spot stress measurement sensor device according to the present invention described in claim 9 is provided.
A first strain gauge composed of a general-purpose single-axis strain gauge having a first rated resistance value, which is attached at a first predetermined distance from the weld toe;
A second predetermined distance different from the first predetermined distance from the weld toe, comprising a general-purpose uniaxial strain gauge having a second rated resistance value that is 1/3 of the first rated resistance value. A second strain gauge affixed to
The first strain gauge and the second strain gauge are connected to both ends, and one end of the first strain gauge is connected to one end of the second strain gauge, and 2 / of the rated resistance value of the first strain gauge. A first fixed resistor having a resistance value of 3, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge, and one end A third fixed resistor connected to the other end of the second fixed resistor and having the other end connected to one end of the first strain gauge and having a resistance value equal to a rated resistance value of the first strain gauge; A first derivation terminal for deriving a connection point between the one end of the first strain gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor. A second lead-out terminal for deriving a connection point with the one end, the second A third lead terminal for deriving a connection point between the one end of the fixed resistor and the other end of the first fixed resistor, and the other ends of the first strain gauge and the second strain gauge are commonly used. A fourth derivation terminal connected and derived, wherein a bridge input is supplied between the first derivation terminal and the third derivation terminal, and the second derivation terminal and the fourth derivation terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
It is characterized by comprising.

A hot spot stress measurement sensor device according to the present invention described in claim 10 is the hot spot stress measurement sensor device according to any one of claims 7 to 9,
The bridge adapter further includes a fifth lead terminal for leading a connection point between the one end of the second gauge portion or the second strain gauge and the one end of the first fixed resistor, A strain resistance value output of the first gauge unit or the first strain gauge is provided between the first derivation terminal and the fourth derivation terminal, and the fifth derivation terminal and the fourth derivation terminal. The strain resistance value output of the second gauge portion or the second strain gauge is individually taken out from between the two.

According to the present invention, hot spot stress measurement strain is easy to position and mount for measuring hot spot stress, has high workability, and can easily and accurately measure hot spot stress. Gauge and hot spot stress measurement sensor devices can be provided.
That is, according to the strain gauge for measuring hot spot stress according to claim 1 of the present invention,
A gauge base made of a film-like insulator having flexibility, and having a first rated resistance value, and being positioned at a first predetermined distance in the predetermined direction from one end of the gauge base in a predetermined direction. A first gauge portion which is disposed on the gauge base and detects strain in the predetermined direction; and a second rated resistance value which is 1/3 of the first rated resistance value. The second base is disposed on the gauge base at a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the base, and detects a strain in the predetermined direction. By having a gauge part of
It is possible to easily perform appropriate alignment for measuring the hot spot stress, to improve workability, and to measure the hot spot stress easily and accurately.

Moreover, according to the strain gauge for hot spot stress measurement of claim 2 of the present invention, in the strain gauge for hot spot stress measurement of claim 1,
The first gauge portion and the second gauge portion are set in advance to the first predetermined distance and the second predetermined distance corresponding to various plate thicknesses of a member to be welded as a hot spot stress measurement target. By preparing them and using them according to the various plate thicknesses of the welded members to be measured,
Depending on the condition of the member to be welded, it is possible to easily obtain the hot spot stress directly as the bridge output.
Furthermore, according to the strain gauge for hot spot stress measurement according to claim 3 of the present invention, in the strain gauge for hot spot stress measurement according to claim 1 or 2,
By setting the plate thickness of a member to be welded as a hot spot stress measurement target to T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T.
In particular, it is possible to more easily perform hot spot stress measurement according to typical definitions.

According to the hot spot stress measurement strain gauge of claim 4 of the present invention,
A gauge base made of a film-like insulator having flexibility, and having a first rated resistance value, arranged at a first predetermined distance in the predetermined direction from one end of the gauge base in the predetermined direction; A gauge that is affixed to a gauge base and has a first gauge for detecting strain in the predetermined direction; a second rated resistance value that is 1/3 of the first rated resistance value; And a second predetermined distance from the one end of the first predetermined distance that is different from the first predetermined distance in the predetermined direction, and affixed on the gauge base to detect strain in the predetermined direction. By having a gauge,
It is possible to easily perform appropriate alignment for measuring the hot spot stress, to improve workability, and to measure the hot spot stress easily and accurately.
According to the strain gauge for hot spot stress measurement of claim 5 of the present invention, in the strain gauge for hot spot stress measurement of claim 4,
The first gauge and the second gauge are general-purpose uniaxial strain gauges having the first rated resistance value and the second rated resistance value, respectively. By sticking on the gauge base as the first predetermined distance and the second predetermined distance corresponding to various plate thicknesses of the member to be welded,
Depending on the condition of the member to be welded, the hot spot stress can be directly obtained as the bridge output with a simple configuration and easily.

According to the strain gauge for hot spot stress measurement of claim 6 of the present invention, in the strain gauge for hot spot stress measurement of claim 4 or claim 5,
By setting the plate thickness of a member to be welded as a hot spot stress measurement target to T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T.
In particular, it is possible to more easily perform hot spot stress measurement according to typical definitions.
And according to the hot spot stress measurement sensor device of claim 7 of the present invention,
The strain for hot spot stress measurement according to any one of claims 1 to 3, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The first gauge portion is connected to both ends of the first gauge portion and the second gauge portion of the strain gauge for measuring hot spot stress, and one end is connected to one end of the second gauge portion. A first fixed resistor having a resistance value that is 2/3 of the rated resistance value of the portion, one end connected to the other end of the first fixed resistor, and a resistance value equal to the rated resistance value of the first gauge portion A second fixed resistor having one end connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge portion and having a resistance value equal to the rated resistance value of the first gauge portion A first fixed terminal for deriving a connection point between the one end of the first gauge portion and the other end of the third fixed resistor, and the other of the second fixed resistance. A second lead-out end for deriving a connection point between the end and the one end of the third fixed resistor , A third lead terminal for deriving a connection point between the one end of the second fixed resistor and the other end of the first fixed resistor, and each of the first gauge portion and the second gauge portion A fourth derivation terminal that is connected in common to the other end, and a bridge input is supplied between the first derivation terminal and the third derivation terminal; A bridge adapter from which a bridge output corresponding to the hot spot stress is taken out from between the fourth lead-out terminal,
The hot spot stress can be accurately measured with a simple configuration and good workability.

According to the hot spot stress measurement sensor device of claim 8 of the present invention,
The strain for hot spot stress measurement according to any one of claims 4 to 6, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The hot spot stress measurement strain gauge is connected to both ends of the first gauge and the second gauge, one end of which is connected to one end of the second gauge, and the rated resistance of the first gauge. A first fixed resistor having a resistance value 2/3 of the first value, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge A third fixed resistor having one resistance connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge and having a resistance value equal to the rated resistance value of the first gauge A first lead-out terminal for deriving a connection point between the one end of the first gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor A second lead-out terminal for deriving a connection point with the one end of the second end, and the second fixed terminal. A third lead-out terminal for deriving a connection point between the one end of the resistor and the other end of the first fixed resistor; and the other ends of the first gauge and the second gauge are connected in common. A fourth deriving terminal for deriving; a bridge input is supplied between the first deriving terminal and the third deriving terminal; and between the second deriving terminal and the fourth deriving terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
With a simple configuration, it is possible to easily cope with the situation of various members to be welded, the workability is good, and the hot spot stress can be accurately measured.

According to the hot spot stress measurement sensor device of claim 9 of the present invention,
A first strain gauge composed of a general-purpose single-axis strain gauge having a first rated resistance value, which is attached at a first predetermined distance from the weld toe;
A second predetermined distance different from the first predetermined distance from the weld toe, comprising a general-purpose uniaxial strain gauge having a second rated resistance value that is 1/3 of the first rated resistance value. A second strain gauge affixed to
The first strain gauge and the second strain gauge are connected to both ends, and one end of the first strain gauge is connected to one end of the second strain gauge, and 2 / of the rated resistance value of the first strain gauge. A first fixed resistor having a resistance value of 3, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge, and one end A third fixed resistor connected to the other end of the second fixed resistor and having the other end connected to one end of the first strain gauge and having a resistance value equal to a rated resistance value of the first strain gauge; A first derivation terminal for deriving a connection point between the one end of the first strain gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor. A second lead-out terminal for deriving a connection point with the one end, the second A third lead terminal for deriving a connection point between the one end of the fixed resistor and the other end of the first fixed resistor, and the other ends of the first strain gauge and the second strain gauge are commonly used. A fourth derivation terminal connected and derived, wherein a bridge input is supplied between the first derivation terminal and the third derivation terminal, and the second derivation terminal and the fourth derivation terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
With a simpler configuration, it is possible to deal with the situation of various members to be welded, and it is possible to accurately measure the hot spot stress.

Furthermore, according to the hot spot stress measurement sensor device of claim 10 of the present invention, in the hot spot stress measurement sensor device of any one of claims 7 to 9,
The bridge adapter further includes a fifth lead terminal for leading a connection point between the one end of the second gauge portion or the second strain gauge and the one end of the first fixed resistor, A strain resistance value output of the first gauge unit or the first strain gauge is provided between the first derivation terminal and the fourth derivation terminal, and the fifth derivation terminal and the fourth derivation terminal. The strain resistance value output of the second gauge part or the second strain gauge is individually taken out from between
Furthermore, with a simple configuration, the hot spot stress and the stress strain at each predetermined position can be individually measured.

It is a schematic diagram which shows the structure of the hot spot stress measurement system which uses the strain gauge for hot spot stress measurement which concerns on the 1st Embodiment of this invention, and the hot spot stress measurement sensor apparatus containing the same, Hot spot stress measurement The strain gauge for operation is shown as a plan view and the configuration of the bridge adapter is shown as a circuit configuration diagram. It is a perspective view which shows the use condition of the strain gauge for hot spot stress measurement shown in FIG. It is a circuit block diagram which shows typically the equivalent structure of the bridge circuit comprised by the strain gauge for hot spot stress measurement which comprises the hot spot stress measurement sensor apparatus shown in FIG. 1, and a bridge adapter. It is a schematic diagram which shows the structure of the hot spot stress measurement system using the strain gauge for hot spot stress measurement which concerns on the 2nd Embodiment of this invention, and a hot spot stress measurement sensor apparatus containing the same, Hot spot stress measurement The strain gauge for operation is shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram. It is a schematic diagram which shows the structure of the scanner type hot spot stress measurement system which uses the strain gauge for hot spot stress measurement concerning the 3rd Embodiment of this invention, and the hot spot stress measurement sensor apparatus containing the same, This In this case, the strain gauge for measuring hot spot stress is shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram. Schematic diagram showing the configuration of a hot spot stress measurement system using two uniaxial strain gauges for hot spot stress measurement and a hot spot stress measurement sensor device including the strain gauge according to the fourth embodiment of the present invention. Also in this case, two strain gauges for measuring hot spot stress are shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram. It is a schematic diagram for demonstrating the example of the definition of the hot spot stress used for the hot spot stress measurement which concerns on this invention.

Hereinafter, based on an embodiment of the present invention, a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of a hot spot stress measurement system using a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device including the same according to the first embodiment of the present invention. The strain gauge for spot stress measurement is shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram. FIG. 2 is a perspective view showing a usage state of the strain gauge for measuring hot spot stress shown in FIG.
The hot spot stress measurement system shown in FIG. 1 includes a hot spot stress measurement strain gauge 1, a bridge adapter 2, and a measuring instrument 3. The strain gauge 1 for hot spot stress measurement and the bridge adapter 2 constitute a hot spot stress measurement sensor device.
The strain gauge 1 for hot spot stress measurement shown in FIGS. 1 and 2 includes a gauge base 11 and a gauge pattern 12. The gauge pattern 12 includes a first grid part GA as a first gauge part made of a gauge grid, a second grid part GB as a second gauge part made of a gauge grid, and a first grid appropriately through a gauge lead. Gauge tabs TA1 and TA2 connected to both ends of the grid part GA, and gauge tabs TB1 and TB2 connected to both ends of the second grid part GB through gauge leads as appropriate.

  As shown in FIG. 1, the gauge base 11 is made of a film-like insulator made of a synthetic resin such as a flexible phenol resin or polyimide resin, which is formed in an elongated rectangular shape. The gauge pattern 12 made of a metal foil formed on the gauge base 11 is a first grid portion of the gauge resistance Rga disposed at a first predetermined distance DA in the longitudinal direction from one end LE in the longitudinal direction of the gauge base 11. GA and tabs TA1 and TA2 connected to both ends of the first grid part GA through gauge leads as appropriate, and a second predetermined distance longer than the first predetermined distance DA in the longitudinal direction from the one end LE. A second grid portion GB of the gauge resistor Rgb disposed in the DB and gauge tabs TB1 and TB2 connected to both ends of the second grid portion GB through gauge leads as appropriate. The gauge resistance Rgb of the second grid part GB has a resistance value that is 1/3 of the gauge resistance Rga of the first grid part GA (that is, Rgb = (1/3) Rga).

For example, the first grid portion GA is formed so that a large number of narrow and narrow portions are folded back in parallel along the longitudinal direction so that the resistance value changes due to expansion and contraction in the longitudinal direction of the gauge base 11. A folding pattern is formed, the folding center line is positioned at a first predetermined distance DA from one end LE in the longitudinal direction, and the folding end is formed with a wide width so that the resistance value is sufficiently low. Etc. Further, the second grid portion GB is formed by repeatedly forming a plurality of elongated and narrow portions along the longitudinal direction in parallel so that the resistance value is changed by expansion and contraction in the longitudinal direction of the gauge base 11. A folding pattern is formed, the center line of the folding is positioned at a second predetermined distance DB from one end LE in the longitudinal direction, and the resistance value is sufficiently low at the folding end in the direction orthogonal to the longitudinal direction. A wide width is formed.
Both ends of the first grid portion GA are connected to gauge tabs TA1 and TA2 for external connection through gauge leads that extend in the longitudinal direction along both sides of the gauge base 11 and have a sufficiently low resistance value, respectively. Has been. At this time, the gauge leads drawn from both ends of the first grid portion GA to the gauge tabs TA1 and TA2 are formed and arranged so as to be detoured so as not to interfere with the second grid portion GB. Both ends of the second grid part GB are respectively connected to gauge tabs TB1 and TB2 for external connection via gauge leads formed sufficiently short so that the resistance value is sufficiently low.

In this case, the ratio of the rated resistance value of the gauge resistance Rga of the first grid part GA to the rated resistance value of the gauge resistance Rgb of the second grid part GB is set to 3: 1 as described above. Rgb = (1/3) Rga is set.
At this time, when the resistance value of the gauge lead can be sufficiently reduced by simply widening the width of the wiring pattern of the gauge lead serving as the conduction path, a metal foil made of a resistive metal is used for the entire gauge pattern 12. May be formed. Alternatively, the first grid portion GA and the second grid portion GB are formed using a resistive metal such as a nickel-chromium alloy or a copper-nickel alloy whose resistance value changes due to expansion and contraction, and the first of the gauge pattern 12 is formed. The gauge tabs TA1, TA2, TB1, TB2 other than the grid portion GA and the second grid portion GB, and the portion of the gauge lead between them and the first grid portion GA and the second grid portion GB are more resistant. You may make it form using a conductive metal with a low value.
As shown in FIG. 2, the strain gauge 1 for measuring hot spot stress is used by being attached (or attached) to a member to be measured by adhesion, fusion, sputtering, vapor deposition, or other means. It is done. That is, in a typical structure in which the end of the plate-like second member M2 is welded vertically on the plate-like first member M1, a hot spot is formed on the weld toe HS of the weld W. The strain gauge 1 for hot spot stress measurement is affixed on the 1st member M1, in the state which face | matched the longitudinal end LE of the strain gauge 1 for stress measurement.

In such a state, the gauge resistance Rga due to the first grid part GA appearing between the gauge tabs TA1 and TA2 and the gauge resistance Rgb due to the second grid part GB appearing between the gauge tabs TB1 and TB2 are replaced with lead wires or the like. And connected to the gauge side terminals TG1, TG2, TG3, and TG4 of the bridge adapter 2 to provide hot spot stress measurement at the weld toe HS.
The bridge adapter 2 has gauge side terminals TG1, TG2, TG3, and TG4 and measuring instrument side terminals TM1, TM2, TM3, TM4, and TM5, and a first fixed resistor R1 and a second fixed are interposed therebetween. The resistor R2, the third fixed resistor R3, and a predetermined conduction path are connected. That is, the gauge tabs TA1 and TA2 respectively connected to both ends of the first grid part GA as the first gauge part and the second grid part GB as the second gauge part of the strain gauge 1 for hot spot stress measurement. Also, gauge side terminals TG1 and TG4 and gauge side terminals TG2 and TG3 are connected to the gauge tabs TB1 and TB2.

The first fixed resistance R1 is a difference between the rated resistance value Rga of the first grid part GA and the rated resistance value Rgb (= (1/3) Rga) of the second grid part GB, that is, the first grid part. It has a resistance value that is 2/3 of the rated resistance value Rga of GA, and one end thereof is connected to one end of the second grid portion GB via a gauge side terminal TG2 and a gauge tab TB1. The second fixed resistor R2 has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end thereof is connected to the other end of the first fixed resistor R1. The third fixed resistor R3 also has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end of the third fixed resistor R3 is the second fixed resistor R2. The other end of the third fixed resistor R3 is connected to one end of the first grid portion GA via the gauge side terminal TG1 and the gauge tab TA1.
A connection point between the gauge side terminal TG1 connected to the one end of the first grid part GA and the other end of the third fixed resistor R3 is led to the measuring instrument side terminal TM1 which is the first lead terminal, A connection point between the other end of the second fixed resistor R2 and the one end of the third fixed resistor R3 is led out to the measuring instrument side terminal TM2 which is a second lead-out terminal, and the one end of the second fixed resistor R A connection point with the other end of the fixed resistor R1 is led to a measuring instrument side terminal TM3 which is a third lead terminal, and a gauge side terminal TG3 connected to the other end of the first grid portion GA A gauge side terminal TG4 connected to the other end of the second grid portion GB is connected in common and led out to a measuring instrument side terminal TM4 which is a fourth lead terminal.

Although not used in this case, the bridge adapter 2 includes a gauge-side terminal TG2 connected to the one end of the first fixed resistor R1 and the one end of the second grid part GB via the gauge tab TB1. A measuring instrument side terminal TM5 for deriving the connection point is provided.
The measuring instrument 3 has one or more measuring channels, and the measuring instrument side terminals TM1 to TM4 of the bridge adapter 2 are connected to the channel 1, and the measuring instrument 3 is connected to the measuring instrument side terminal TM1 of the bridge adapter 2. And a measuring instrument side terminal TM3, a bridge input is supplied, and a bridge output corresponding to the hot spot stress is taken out between the measuring instrument side terminal TM2 and the measuring instrument side terminal TM4 of the bridge adapter 2.
Next, the basic measurement principle of the hot spot stress in such a hot spot stress measurement sensor device having the strain gauge 1 for measuring hot spot stress and the bridge adapter 2 will be described with reference to FIG.
FIG. 7 is a schematic diagram schematically showing a combination of the measured value of the stress according to the cross section of the weld and the distance from the weld toe HS and the estimated value of the hot spot stress at the weld toe HS. ing.

As shown in FIG. 7, the stresses ε _A and ε _{B at} the position PA of the first predetermined distance DA from the weld toe portion HS and the position PB of the second predetermined distance DB longer than the first predetermined distance DA, respectively. Are connected to each other by a straight line, and the stress ε _H at the weld toe portion HS is estimated on the extended line. Here, the values to be set as the first predetermined distance DA from the weld toe portion HS to the position PA and the second predetermined distance DB from the weld toe portion HS to the position PB differ depending on the analysis method, and It also varies depending on the plate thickness t of the material such as the first member M1 and the second member M2. For example, as shown in the figure, if the first predetermined distance DA is 0.5 t and the interval between the position PA and the position PB is 1.0 t, the second predetermined distance DB is 1.5 t. Thus, the hot spot stress ε _H at the weld toe portion HS can be calculated.
ε _H = {(ε _A −ε _B ) / t} × 0.5 t} + ε _A
= 1.5ε _A −0.5ε _B (1)
For example, when the plate thickness t of the first member M1 and the second member M2 is 10 [mm], the first grid is positioned at 5 [mm] and 15 [mm] from the weld toe portion HS. The part GA and the second grid part GB are located respectively.

As shown in FIG. 1, the strain gauge 1 for hot spot stress measurement according to this embodiment includes a first grid part GA and a second grid part that each form a gauge part on a single gauge base 11 in advance. The grid part GB is arranged as a gauge pattern 12. That is, the first predetermined distance DA from the longitudinal end LE of the gauge base 11 is 5 [mm] between the first grid part GA which is the first gauge part and the second grid part GB which is the second gauge part. ] And the second predetermined distance DB are formed at positions of 15 [mm], respectively.
Therefore, the strain gauge 1 for measuring the hot spot stress is attached to the first member M1 with the end LE in the longitudinal direction of the gauge base 11 abutted against the weld toe HS as shown in FIG. Accordingly, the first grid portion 21 is correctly arranged at the position PA of 5 [mm] which is the first predetermined distance DA from the weld toe portion HS, and is the second predetermined distance DB from the weld toe portion HS. The second grid portion 22 is correctly arranged at the position PB of 15 [mm].
As described above, the hot spot stress measuring strain gauge 1 is connected to the bridge adapter 2 according to the present invention to constitute a hot spot stress measuring sensor device according to the present invention. The principle of the present invention will be described with reference to FIG. 3 showing an equivalent circuit of a bridge circuit composed of the hot spot stress measuring strain gauge 1 and the bridge adapter 2.

As described above, the rated resistance value Rgb of the second grid part GB is 1/3 of the rated resistance value Rga of the first grid part GA, that is, (1/3) Rga. When stress ε is applied to each of the first grid part GA and the second grid part GB, and the output of the first grid part GA is ε, the output of the second grid part GB is ( 1/3) epsilon. The resistance value of the first fixed resistor R1 is the difference Rga-Rgb between the rated resistance value Rga of the first grid part GA and the rated resistance value Rgb of the second grid part GB, that is, the first grid part GA. The resistance value of the second fixed resistor R2 and the third fixed resistor R3 is 2/3 of the rated resistance value Rga of the first grid portion GA. The resistance value Rga is equal to the value Rga. The first to third resistors R1 to R3 are fixed resistors installed in the bridge adapter 2, and the resistance value does not change even when stress is received.
In the bridge circuit set to such a resistance value, when the stress ε _A is applied to the first grid portion GA and the stress ε _B is applied to the second grid portion GB, the bridge circuit of FIG. The overall output is expressed by the following equation.
ε _A − (1/3) ε _B (2)
Therefore, when the output of the bridge circuit taken out from the bridge adapter 2 is multiplied by 1.5 in the measuring instrument 3 to which the bridge adapter 2 is connected, the following equation is obtained.

ε _H = 1.5ε _A −0.5ε _B (3)
This equation (3) is the same as equation (1), and as the bridge output obtained from the bridge adapter 2, a value corresponding to the hot spot stress ε _H at the weld toe HS can be obtained. The hot spot stress ε _H can be directly measured simply by adjusting the gain.
Therefore, the hot spot stress measurement sensor device using the hot spot stress measurement strain gauge 1 according to this embodiment is a hot spot stress measurement sensor device optimally formed on the members M1 and M2 having the plate thickness t. be able to.
The optimum positions of the first predetermined distance DA and the second predetermined distance DB differ depending on the analysis method, but the stresses at two points in the vicinity of the weld toe portion HS are obtained to estimate the hot spot stress at the one end LE. Since the method is basically the same, in principle, any analysis method can be supported. Accordingly, a number of strain gauges 1 for measuring hot spot stresses having various first predetermined distances DA and second predetermined distances DB are prepared corresponding to the plurality of analysis methods and the thicknesses t of the plurality of members to be welded. By selecting one corresponding to the desired analysis method and plate thickness t from them and applying it to the hot spot stress measurement sensor device according to this embodiment, various analysis methods and plate thicknesses t can be obtained. A corresponding hot spot stress measurement sensor device can be constructed. In this case, the strain gauge 1 for hot spot stress measurement has a configuration having only two gauge parts, a first grid part GA as a first gauge part and a second grid part GB as a second gauge part. Therefore, it can be configured compactly and can flexibly cope with various shapes and dimensions of the member to be welded.

FIG. 4 is a schematic diagram showing the configuration of a hot spot stress measurement system using a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device including the hot spot stress measurement strain gauge according to the second embodiment of the present invention. The strain gauge for spot stress measurement is shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram.
The hot spot stress measurement system shown in FIG. 4 includes a strain gauge 4 for measuring hot spot stress according to the second embodiment, and a bridge adapter 2 and a measuring instrument similar to those in the first embodiment shown in FIG. 3 is provided. Also in this case, the hot spot stress measurement strain gauge 4 and the bridge adapter 2 constitute a hot spot stress measurement sensor device.
The hot spot stress measurement strain gauge 4 shown in FIG. 4 includes a gauge base 41, a first strain gauge 42, and a second strain gauge 43. The first strain gauge 42 is a strain gauge that forms a first grid portion GA made of a gauge grid, and a single-axis type general-purpose strain gauge can be used. The 2nd strain gauge 43 is a strain gauge which forms the 2nd grid part GB which consists of a gauge grid, and can use a general purpose strain gauge of a single axis type. The first strain gauge 42 including the first grid part GA has a lead wire LA1 connected to one end of the first grid part GA and a lead wire LA2 connected to the other end of the first grid part GA. is doing. The second strain gauge 43 including the second grid portion GB has a lead wire LB1 connected to one end of the second grid portion GB and a lead wire LB2 connected to the other end of the second grid portion GB. is doing.

As shown in FIG. 4, the gauge base 41 is made of a film-like insulator, such as a synthetic resin such as a polyester resin, which has flexibility and is formed in an elongated rectangular shape. The first strain gauge 42 has a rated resistance value of a resistance value Rga, and the first strain gauge 42 is connected to the gauge base 41 at a first predetermined distance DA in the longitudinal direction from one end LE in the longitudinal direction. It arrange | positions so that the 1st grid part GA of Rga may be located, and it affixes on the gauge base 41. FIG. The second strain gauge 43 has a rated resistance value Rgb of a resistance value Rgb (= (1/3) Rga, and the second strain gauge 43 is connected to the longitudinal direction from one end LE of the gauge base 41 in the longitudinal direction. It arrange | positions so that the 2nd grid part GB of gauge resistance Rgb may be located in 2nd predetermined distance DB, and it adheres by means, such as adhesion | attachment, on the gauge base 41. That is, also in this case, the 2nd grid The gauge resistance Rgb of the part GB has a resistance value that is 1/3 of the gauge resistance Rga of the first grid part GA (that is, Rgb = (1/3) Rga).
In this case, the first strain gauge 42 that forms the first grid part GA has a gauge base such that the resistance value of the first grid part GA changes due to expansion and contraction (strain) in the longitudinal direction of the gauge base 41. The direction is aligned with the longitudinal direction of 41, and the center line is positioned at a first predetermined distance DA from one end LE in the longitudinal direction, and is stuck on the gauge base 41.

The second strain gauge 43 that forms the second grid portion GB has a gauge base 41 so that the resistance value of the second grid portion GB changes due to expansion and contraction (strain) in the longitudinal direction of the gauge base 41. The center line is positioned at a second predetermined distance DB from one end LE in the longitudinal direction, and is stuck on the gauge base 41.
Such a strain gauge 4 for measuring hot spot stress is also used by being attached to a member to be measured as in FIG. That is, in a typical structure in which the end of the plate-like second member M2 is welded vertically on the plate-like first member M1, a hot spot is formed on the weld toe HS of the weld W. The hot spot stress measurement strain gauge 4 is affixed onto the first member M1 in a state in which one end LE in the longitudinal direction of the stress measurement strain gauge 4 is abutted.
In such a state, the gauge resistance Rga by the first grid portion GA of the first strain gauge 42 and the gauge resistance Rgb by the second grid portion GB of the second strain gauge 43 are respectively changed to the lead wires LA1 and LA2 and the leads. It connects to the gauge side terminals TG1, TG2, TG3 and TG4 of the bridge adapter 2 via the lines LB1 and LB2, and is used for measurement of hot spot stress at the weld toe HS.

Also in the second embodiment, as in the case of the first embodiment, the bridge adapter 2 includes the gauge side terminals TG1, TG2, TG3 and TG4 and the measuring instrument side terminals TM1, TM2, TM3 and TM4. And TM5, and a first fixed resistor R1, a second fixed resistor R2, a third fixed resistor R3, and a predetermined conduction path are connected between them. That is, the lead wires LA1 and LA2 connected to both ends of the first strain gauge 42 forming the first grid portion GA as the first gauge portion of the strain gauge 4 for hot spot stress measurement are connected to the gauge side terminal TG1. And TG4, and lead wires LB1 and LB2 connected to both ends of the second strain gauge 43 forming the second grid part GB as the second gauge part are respectively connected to the gauge side terminals TG2 and TG3. Connected.
The first fixed resistance R1 is a difference between the rated resistance value Rga of the first grid part GA and the rated resistance value Rgb (= (1/3) Rga) of the second grid part GB, that is, the first grid part. It has a resistance value that is 2/3 of the rated resistance value Rga of GA, and one end thereof is connected to one end of the second grid portion GB via the gauge side terminal TG2 and the lead wire LB1. The second fixed resistor R2 has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end thereof is connected to the other end of the first fixed resistor R1. The third fixed resistor R3 also has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end of the third fixed resistor R3 is the second fixed resistor R2. The other end of the third fixed resistor R3 is connected to one end of the first grid portion GA via the gauge side terminal TG1 and the lead wire LA1.

A connection point between the gauge side terminal TG1 connected to the one end of the first grid part GA and the other end of the third fixed resistor R3 is led to the measuring instrument side terminal TM1 which is the first lead terminal, A connection point between the other end of the second fixed resistor R2 and the one end of the third fixed resistor R3 is led out to the measuring instrument side terminal TM2 which is a second lead-out terminal, and the one end of the second fixed resistor R A connection point with the other end of the fixed resistor R1 is led to a measuring instrument side terminal TM3 which is a third lead terminal, and a gauge side terminal TG4 connected to the other end of the first grid part GA; A gauge side terminal TG3 connected to the other end of the second grid part GB is connected in common and led out to a measuring instrument side terminal TM4 which is a fourth lead terminal. Although not used in this case, the bridge adapter 2 includes a gauge-side terminal TG2 connected to the one end of the first fixed resistor R1 and the one end of the second grid portion GB via the gauge tab TB2. A measuring instrument side terminal TM5 for deriving the connection point is provided.
The measuring instrument 3 has one or more measuring channels, and the measuring instrument side terminals TM1 to TM4 of the bridge adapter 2 are connected to the channel 1, and the measuring instrument 3 is connected to the measuring instrument side terminal TM1 of the bridge adapter 2. And a measuring instrument side terminal TM3, a bridge input is supplied, and a bridge output corresponding to the hot spot stress is taken out between the measuring instrument side terminal TM2 and the measuring instrument side terminal TM4 of the bridge adapter 2.

According to the hot spot stress measurement sensor device having such a hot spot stress measurement strain gauge 4 and the bridge adapter 2, the hot spot stress can be measured in the same manner as in the first embodiment.
That is, at the time of product manufacture or hot spot stress measurement, the position of the first strain gauge 42 and the second strain gauge 43 is adjusted to the optimal positional relationship for each hot spot stress definition method and plate thickness, and the gauge base By sticking on 41, it becomes possible to easily meet various needs. In order to attach the first strain gauge 42 and the second strain gauge 43 to the optimum position on the gauge base 41 according to the hot spot stress definition method and the plate thickness, a jig or ruler created exclusively for the hot spot stress is used. May be used, and a mark or the like for adhering to an optimal position on the gauge base 41 may be appropriately printed.
However, as described above, the rated resistance values of the first strain gauge 42 and the second strain gauge 43 are second with respect to the resistance value of the first grid portion GA by the first strain gauge 42. It is necessary to select so that the resistance value of the second grid portion GB by the strain gauge 43 becomes 1/3.

Generally, there are 60Ω, 120Ω, 350Ω, 700Ω, etc. as the rated resistance value of a general-purpose single axis type strain gauge. For example, as the first strain gauge 42 of the first grid portion GA, A strain gauge having a rated resistance value of 350Ω is selected, and a strain gauge having a rated resistance value of 120Ω is selected as the second strain gauge 43 of the second grid portion GB. The output of the bridge circuit in this case is expressed by the following equation.
ε _A − (120/350) ε _B (4)
The hot spot stress ε _H obtained by multiplying the circuit output by 1.5 in the measuring device 3 is expressed by the following equation.
ε _H = 1.5ε _A −0.51ε _B (5)
Strictly speaking, this equation (5) is not the same as the definition of hot spot stress in equation (1), but the difference is −0.01ε _B , and if this degree of error is allowed, It is considered that there is no problem in normal specifications.
Note that the optimum positions of the first predetermined distance DA and the second predetermined distance DB differ depending on the analysis method, but the hot spot stress at one end LE is estimated by obtaining two stresses in the vicinity of the weld toe portion HS. Since the method to perform is basically the same, in principle, any analysis method can be supported.

Accordingly, the first strain gauge 42 and the second strain gauge are used as various first predetermined distances DA and second predetermined distance DBs corresponding to the plurality of analysis methods and the thicknesses t of the plurality of members to be welded. 43 is attached to the gauge base 41 to create a hot spot stress measurement strain gauge 4 corresponding to a desired analysis method and thickness t, and the hot spot stress measurement sensor device according to this embodiment is used. By applying, a hot spot stress measurement sensor device corresponding to various analysis methods and plate thickness t can be configured.
FIG. 5 is a schematic diagram showing a configuration of a hot spot stress measurement system using a hot spot stress measurement strain gauge and a hot spot stress measurement sensor device including the hot spot stress measurement strain gauge according to the third embodiment of the present invention. The strain gauge for spot stress measurement is shown as a plan view, and the configuration of the bridge adapter is shown as a circuit configuration diagram.
The hot spot stress measurement system shown in FIG. 5 includes the same hot spot stress measurement strain gauge 4 and bridge adapter 2 as those of the first embodiment shown in FIG. 1, and a measuring instrument according to the third embodiment. 5 is provided. Also in this case, the hot spot stress measurement strain gauge 4 and the bridge adapter 2 constitute a hot spot stress measurement sensor device similar to that shown in FIG.

The measuring instrument 5 shown in FIG. 5 is a scanner type measuring instrument, and has a plurality of channels, for example, three channels 1 to 3 as shown in the figure, and scans these channels and selects them sequentially. Can be measured by switching between them. In the case of such a scanner type, when measuring one channel, the connection circuit of the other channel is cut off, and a plurality of channels are not measured simultaneously.
Also in the third embodiment, the bridge adapter 2 is the same as in the first and second embodiments. However, the bridge adapter 2 is not used in the first and second embodiments. A measuring instrument side terminal TM5 for deriving a connection point between the one end of the fixed resistor R1 of 1 and the gauge side terminal TG2 connected to the one end of the second grid part GB via the gauge tab TB1 is used.
The measuring instrument 5 has a plurality of measuring channels and is a scanner type measuring instrument that selectively scans these channels and scans the channel 1 with the bridge adapter 2 as in the first and second embodiments. The measuring instrument side terminals TM1 to TM4 are connected, the measuring instrument side terminals TM1 and TM4 of the bridge adapter 2 are connected to the channel 2, and the measuring instrument side terminals TM5 and TM4 of the bridge adapter 2 are connected to the channel 3.

When the channel 1 is selected, the measuring instrument 5 supplies a bridge input between the measuring instrument side terminal TM1 and the measuring instrument side terminal TM3 of the bridge adapter 2, and the measuring instrument side terminal TM2 of the bridge adapter 2 and the measuring instrument side. A bridge output corresponding to the hot spot stress is taken out from the terminal TM4. When the channel 2 is selected, the measuring instrument 5 is connected to both ends of the first grid portion GA of the first strain gauge 42, and the first grid portion GA of the first strain gauge 42 outputs a first The strain at the position of the grid portion GA is measured, and when the channel 3 is selected, the measuring instrument 5 is connected to both ends of the second grid portion GB of the second strain gauge 43 and the second strain gauge 43 The strain at the position of the second grid part GB is measured by the second grid part GB.
According to the hot spot stress measurement sensor device using such a scanner type measuring instrument 5, the hot spot stress, the strain at the first predetermined distance DA, and the strain at the second predetermined distance DB are individually and almost simultaneously measured. In addition to hot spot stress, it is also possible to measure a rough stress distribution.
Further, FIG. 6 is a schematic diagram showing a configuration of a hot spot stress measurement system using a hot spot stress measurement sensor device according to a fourth embodiment of the present invention. It shows as a figure and the structure of a bridge adapter is shown as a circuit block diagram.

The hot spot stress measurement system shown in FIG. 6 replaces the strain gauge 4 for hot spot stress measurement shown in FIG. 4 with the first strain gauge 6 and the second strain gauge using two individual strain gauges. 7 and the same bridge adapter 2 and measuring instrument 3 as those of the first embodiment shown in FIG.
As shown in FIG. 6, a first strain gauge 6 and a second strain gauge 7 are provided as sensor units. The 1st strain gauge 6 is a strain gauge which forms the 1st grid part GA which consists of a gauge grid, and can use a general purpose strain gauge of a single axis type. The 2nd strain gauge 7 is a strain gauge which forms the 2nd grid part GB which consists of a gauge grid, and can use a single axis type general purpose strain gauge. The first strain gauge 6 including the first grid part GA has a lead wire LA1 connected to one end of the first grid part GA and a lead wire LA2 connected to the other end of the first grid part GA. is doing. The second strain gauge 7 including the second grid portion GB has a lead wire LB1 connected to one end of the second grid portion GB and a lead wire LB2 connected to the other end of the second grid portion GB. is doing.

As shown in FIG. 6, the first strain gauge 6 has a rated resistance value of a resistance value Rga, and the first strain gauge 6 is connected to the first predetermined distance DA from the weld toe portion HS with a gauge resistance. It arrange | positions so that the 1st grid part GA of Rga may be located, and it adheres to the to-be-welded member made into a measuring object. The second strain gauge 7 has a rated resistance value Rgb of a resistance value Rgb (= (1/3) Rga, and the second strain gauge 7 is moved from the weld toe portion HS to a second predetermined distance DB. It arrange | positions so that 2nd grid part GB of gauge resistance Rgb may be located, and it adheres to the to-be-welded member made into a measuring object.In this case, the gauge resistance Rgb of 2nd grid part GB is 1st It has a resistance value of 1/3 of the gauge resistance Rga of the grid part GA (that is, Rgb = (1/3) Rga).
Also in this case, the first strain gauge 6 forming the first grid part GA is oriented in the predetermined direction so that the resistance value of the first grid part GA is changed by expansion and contraction in the predetermined direction, and welding is performed. The center line is positioned at a first predetermined distance DA from the toe portion HS, and is adhered to the member to be welded to be measured. Then, the second strain gauge 7 forming the second grid part GB is oriented in a predetermined direction so that the resistance value of the second grid part GB changes due to expansion and contraction in the predetermined direction, and the weld toe The center line is positioned at the second predetermined distance DB from the part HS, and is adhered to the member to be welded to be measured.

In such a state, the gauge resistance Rga by the first grid portion GA of the first strain gauge 6 and the gauge resistance Rgb by the second grid portion GB of the second strain gauge 7 are respectively changed to the lead wires LA1 and LA2 and the leads. It connects to the gauge side terminals TG1, TG2, TG3 and TG4 of the bridge adapter 2 via the lines LB1 and LB2, and is used for measurement of hot spot stress at the weld toe HS.
Also in the fourth embodiment, as in the case of the second embodiment, the bridge adapter 2 includes the gauge side terminals TG1, TG2, TG3 and TG4 and the measuring instrument side terminals TM1, TM2, TM3 and TM4. And TM5, and a first fixed resistor R1, a second fixed resistor R2, a third fixed resistor R3, and a predetermined conduction path are connected between them. That is, the lead wires LA1 and LA2 connected to both ends of the first strain gauge 6 that forms the first grid part GA as the first gauge part are connected to the gauge side terminals TG1 and TG4, respectively, and the second The lead wires LB1 and LB2 connected to both ends of the second strain gauge 7 forming the second grid part GB as the gauge part are connected to gauge side terminals TG2 and TG3, respectively.

The first fixed resistance R1 is a difference between the rated resistance value Rga of the first grid part GA and the rated resistance value Rgb (= (1/3) Rga) of the second grid part GB, that is, the first grid part. It has a resistance value that is 2/3 of the rated resistance value Rga of GA, and one end thereof is connected to one end of the second grid portion GB via the gauge side terminal TG2 and the lead wire LB1. The second fixed resistor R2 has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end thereof is connected to the other end of the first fixed resistor R1. The third fixed resistor R3 also has a resistance value (Rga) equal to the rated resistance value Rga of the first grid portion GA, and one end of the third fixed resistor R3 is the second fixed resistor R2. The other end of the third fixed resistor R3 is connected to one end of the first grid portion GA via the gauge side terminal TG1 and the lead wire LA1.
A connection point between the gauge side terminal TG1 connected to the one end of the first grid part GA and the other end of the third fixed resistor R3 is led to the measuring instrument side terminal TM1 which is the first lead terminal, A connection point between the other end of the second fixed resistor R2 and the one end of the third fixed resistor R3 is led out to the measuring instrument side terminal TM2 which is a second lead-out terminal, and the one end of the second fixed resistor R A connection point with the other end of the fixed resistor R1 is led to a measuring instrument side terminal TM3 which is a third lead terminal, and a gauge side terminal TG4 connected to the other end of the first grid part GA; A gauge side terminal TG3 connected to the other end of the second grid part GB is connected in common and led out to a measuring instrument side terminal TM4 which is a fourth lead terminal.

Although not used in this case, the bridge adapter 2 includes a gauge-side terminal TG2 connected to the one end of the first fixed resistor R1 and the one end of the second grid part GB via the gauge tab TB1. A measuring instrument side terminal TM5 for deriving the connection point is provided.
The measuring instrument 3 has one or more measuring channels, and the measuring instrument side terminals TM1 to TM4 of the bridge adapter 2 are connected to the channel 1, and the measuring instrument 3 is connected to the measuring instrument side terminal TM1 of the bridge adapter 2. And a measuring instrument side terminal TM3, a bridge input is supplied, and a bridge output corresponding to the hot spot stress is taken out between the measuring instrument side terminal TM2 and the measuring instrument side terminal TM4 of the bridge adapter 2.
According to such a hot spot stress measurement sensor device, the hot spot stress can be measured in substantially the same manner as in the second embodiment.

1, 4 Strain gauge for hot spot stress measurement 2 Bridge adapter 3, 5 Measuring instrument 11, 41 Gauge base 12 Gauge pattern 42, 6 First strain gauge 43, 7 Second strain gauge GA First grid section GB First Grid portion of 2 TA1, TA2, TB1, TB2 Gauge tab LA1, LA2, LB1, LB2 Lead wire Rga, Rgb Gauge resistance value R1-R3 Fixed resistance (resistance value)
TG1 to TG4 Gauge side terminal TM1 to TM4 Measuring instrument side terminal HS Welding start end LE One end in the longitudinal direction of the gauge base W Welded portion M1, M2 Plate-like first and second members

Claims (10)

A gauge base made of a film-like insulator having flexibility;
A strain having a first rated resistance value, disposed on the gauge base at a first predetermined distance in the predetermined direction from one end in the predetermined direction of the gauge base, and strain in the predetermined direction A first gauge part for detecting
The second rated resistance value is 1/3 of the first rated resistance value, and is located at a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the gauge base. A second gauge portion that is disposed on the gauge base and detects strain in the predetermined direction;
A strain gauge for measuring hot spot stress.   The first gauge portion and the second gauge portion are set in advance to the first predetermined distance and the second predetermined distance corresponding to various plate thicknesses of a member to be welded as a hot spot stress measurement target. The strain gauge for hot spot stress measurement according to claim 1, wherein the prepared strain gauges are used in accordance with various plate thicknesses of the welded members to be measured.   2. The thickness of a member to be measured for hot spot stress is T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T. Or the strain gauge for hot spot stress measurement of Claim 2. A gauge base made of a film-like insulator having flexibility;
It has a first rated resistance value, is placed at a first predetermined distance in the predetermined direction from one end of the predetermined direction of the gauge base, is affixed on the gauge base, and detects strain in the predetermined direction A first gauge to
The second rated resistance value is 1/3 of the first rated resistance value, and is arranged at a second predetermined distance different from the first predetermined distance in the predetermined direction from the one end of the gauge base. A second gauge for pasting on the gauge base and detecting strain in the predetermined direction;
A strain gauge for measuring hot spot stress.   The first gauge and the second gauge are general-purpose uniaxial strain gauges having the first rated resistance value and the second rated resistance value, respectively. 5. The hot spot stress measurement according to claim 4, wherein the first predetermined distance and the second predetermined distance corresponding to various plate thicknesses of the member to be welded are attached on the gauge base. Strain gauge.   5. The thickness of a member to be welded as a hot spot stress measurement target is T, the first predetermined distance is 0.5T, and the second predetermined distance is 1.5T. Or the strain gauge for hot spot stress measurement of Claim 5. The strain for hot spot stress measurement according to any one of claims 1 to 3, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The first gauge portion is connected to both ends of the first gauge portion and the second gauge portion of the strain gauge for measuring hot spot stress, and one end is connected to one end of the second gauge portion. A first fixed resistor having a resistance value that is 2/3 of the rated resistance value of the portion, one end connected to the other end of the first fixed resistor, and a resistance value equal to the rated resistance value of the first gauge portion A second fixed resistor having one end connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge portion and having a resistance value equal to the rated resistance value of the first gauge portion A first fixed terminal for deriving a connection point between the one end of the first gauge portion and the other end of the third fixed resistor, and the other of the second fixed resistance. A second lead-out end for deriving a connection point between the end and the one end of the third fixed resistor , A third lead terminal for deriving a connection point between the one end of the second fixed resistor and the other end of the first fixed resistor, and each of the first gauge portion and the second gauge portion A fourth derivation terminal that is connected in common to the other end, and a bridge input is supplied between the first derivation terminal and the third derivation terminal; A bridge adapter from which a bridge output corresponding to the hot spot stress is taken out from between the fourth lead-out terminal;
A hot spot stress measurement sensor device comprising: The strain for hot spot stress measurement according to any one of claims 4 to 6, wherein the one end is brought into contact with a weld toe and the gauge base is attached to a member to be welded for measuring hot spot stress. Gauge,
The hot spot stress measurement strain gauge is connected to both ends of the first gauge and the second gauge, one end of which is connected to one end of the second gauge, and the rated resistance of the first gauge. A first fixed resistor having a resistance value 2/3 of the first value, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge A third fixed resistor having one resistance connected to the other end of the second fixed resistor and the other end connected to one end of the first gauge and having a resistance value equal to the rated resistance value of the first gauge A first lead-out terminal for deriving a connection point between the one end of the first gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor A second lead-out terminal for deriving a connection point with the one end of the second end, and the second fixed terminal. A third lead-out terminal for deriving a connection point between the one end of the resistor and the other end of the first fixed resistor; and the other ends of the first gauge and the second gauge are connected in common. A fourth deriving terminal for deriving; a bridge input is supplied between the first deriving terminal and the third deriving terminal; and between the second deriving terminal and the fourth deriving terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
A hot spot stress measurement sensor device comprising: A first strain gauge composed of a general-purpose single-axis strain gauge having a first rated resistance value, which is attached at a first predetermined distance from the weld toe;
A second predetermined distance different from the first predetermined distance from the weld toe, comprising a general-purpose uniaxial strain gauge having a second rated resistance value that is 1/3 of the first rated resistance value. A second strain gauge affixed to
The first strain gauge and the second strain gauge are connected to both ends, and one end of the first strain gauge is connected to one end of the second strain gauge, and 2 / of the rated resistance value of the first strain gauge. A first fixed resistor having a resistance value of 3, a second fixed resistor having one end connected to the other end of the first fixed resistor and having a resistance value equal to the rated resistance value of the first gauge, and one end A third fixed resistor connected to the other end of the second fixed resistor and having the other end connected to one end of the first strain gauge and having a resistance value equal to a rated resistance value of the first strain gauge; A first derivation terminal for deriving a connection point between the one end of the first strain gauge and the other end of the third fixed resistor; the other end of the second fixed resistor; and the third fixed resistor. A second lead-out terminal for deriving a connection point with the one end, the second A third lead terminal for deriving a connection point between the one end of the fixed resistor and the other end of the first fixed resistor, and the other ends of the first strain gauge and the second strain gauge are commonly used. A fourth derivation terminal connected and derived, wherein a bridge input is supplied between the first derivation terminal and the third derivation terminal, and the second derivation terminal and the fourth derivation terminal A bridge adapter from which the bridge output corresponding to the hot spot stress is taken out,
A hot spot stress measurement sensor device comprising:   The bridge adapter further includes a fifth lead terminal for leading a connection point between the one end of the second gauge portion or the second strain gauge and the one end of the first fixed resistor, A strain resistance value output of the first gauge unit or the first strain gauge is provided between the first derivation terminal and the fourth derivation terminal, and the fifth derivation terminal and the fourth derivation terminal. 10. The strain resistance value output of the second gauge unit or the second strain gauge is individually taken out from between each of the second gauge portion and the second strain gauge, respectively. 10. Hot spot stress measurement sensor device.

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