CN218036159U

CN218036159U - Young modulus force measurement measuring frame for material performance measurement

Info

Publication number: CN218036159U
Application number: CN202222032629.7U
Authority: CN
Inventors: 赵宗坤; 胡骏; 邓语; 朱永幸; 贺瑞雅; 祁娜
Original assignee: Wuchang Institute of Technology
Current assignee: Wuchang Institute of Technology
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2022-12-13
Anticipated expiration: 2032-08-03

Abstract

The utility model provides a young modulus dynamometry measuring rack of material properties survey relates to sensor measurement technical field, including placing the platform, the top rear side position of placing the platform is provided with the master control case, and the top front side position of placing the platform is provided with young modulus apparatus, the top rear side of young modulus apparatus is provided with foil gage sensor module, and the weight gain of elevator piece is realized to quantity through increasing the weight, and gold second increases the pulling force to the wire, through the foil gage resistance R1 that sets up, the change resistance of being convenient for measure the wire, and turn into small deformation and axial tension and measure the method that steel wire young modulus was measured to signal of telecommunication direct measurement steel wire deformation and measure steel wire young modulus has been proven feasible, to the difficulty that faces, the young modulus of using the foil gage to measure the steel wire has been proposed, the change of resistance has been enlargied, thereby the requirement to the laboratory glassware has been reduced.

Description

Young modulus force measurement measuring frame for material performance measurement

Technical Field

The utility model relates to a sensor measurement technical field especially relates to a Young's modulus dynamometry measuring frame of material properties survey.

Background

Young's modulus is an important characteristic quantity describing the relation between material deformation and stress, and is a parameter commonly used in engineering technology. There are many methods for measuring the young's modulus of a material, the most common being the optical lever method. The optical lever method skillfully utilizes an optical lever and multiple reflections to amplify the tiny deformation.

However, in the experiment, the light path is long, so that the light path is difficult to adjust, and an image can not be found or can not be found clearly, so that inconvenience is brought to measurement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving among the prior art however because the light path is longer in the experiment, adjust the light path more difficult, can not find like or the like of finding unclear often, can bring inconvenience for measuring from this, the inconvenience of pure optical method lets us consider can make the experiment more swift with the electrical method and can have the problem of more accurate experimental result again, and the young modulus dynamometry measuring frame of a material properties survey that provides.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a young modulus dynamometry measuring frame of material properties survey, is including placing the platform, the top rear side position of placing the platform is provided with the master control case, and the top front side position of placing the platform is provided with young modulus apparatus, the top rear side of young modulus apparatus is provided with foil gage sensor module, the internal surface of foil gage sensor module is provided with the foil gage, the top center department one side of placing the platform is provided with resistance box R2, resistance box R3 and resistance box R4.

Preferably, a cushion block is arranged at the bottom of the front side of the placing table, a support frame is fixedly connected to the top of the cushion block, and the support frame can be fixedly installed at the position of the support frame through the cushion block.

Preferably, the top of the placing table is provided with a plurality of resistance connecting wires, and the plurality of resistance connecting wires are convenient for connecting various devices to form a full-bridge.

Preferably, the bottom of cushion is threaded all around respectively and is provided with the regulating part, is convenient for realize the inclination adjustment of cushion through rotatory regulating part.

Preferably, the surface of the support frame is close to the bottom and penetrates through the sliding connection with the lifting block, and the height of the lifting block is adjusted, so that when the number of the weights is large, the metal wire can be stretched sufficiently.

Preferably, the screw threads at two sides of the front surface of the lifting block are provided with positioning bolts in a penetrating manner, the screw threads at the center of the top of the lifting block are provided with steel wire clamps in a penetrating manner, and the steel wire clamps adopt a centripetal locking structure, so that the bottom ends of the metal wires can be conveniently locked.

Preferably, the rear end face of the positioning bolt is in sliding connection with the surface of the support frame.

Preferably, the bottom of the steel wire clamp is provided with a weight tray, the surface of the weight tray is connected with weights in a sliding mode, and the weight tray is convenient for placing weights with different quantities and weights.

Preferably, the metal wire is arranged at the center of the inner top of the support frame, the surface of the metal wire is bonded with a strain gauge resistor R1, and the strain gauge resistor R117 is bonded on the surface of the metal wire through glue, so that the resistance of the metal wire can be measured in real time when the metal wire is stretched in the radial direction.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. the utility model discloses in, the weight increase of the quantity through increasing the weight realization elevator, gold two increases the pulling force to the wire, through the foil gage resistance R1 that sets up, be convenient for measure the change resistance of wire, turn into the method that electric signal direct measurement steel wire deformation measured steel wire young modulus with small deformation and axial tension moreover has been proven feasible, to the difficulty that faces, the young modulus of using the foil gage to measure the steel wire has been proposed, the change of resistance has been enlargied, thereby the requirement to the laboratory glassware has been reduced.

Drawings

FIG. 1 is a schematic view of the three-dimensional structure of a Young's modulus force measurement frame for material property measurement according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is an enlarged view at B of FIG. 1;

figure 4 is the utility model provides a material properties survey's young modulus dynamometry measuring rack from taking a bridge according to full-bridge wiring diagram.

Illustration of the drawings: 1. a placing table; 2. a master control box; 3. a resistance box R2; 4. a resistance box R3; 5. a resistance box R4; 6. a Young's modulus tester; 7. a strain gauge; 8. a support frame; 9. a metal wire; 10. a lifting block; 11. a cushion block; 12. a weight tray; 13. a weight; 14. positioning the bolt; 15. an adjustment member; 16. a steel wire clamp; 17. a strain gauge resistor R1; 18. a resistance connecting line; 19. a strain gage sensor module.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations set forth in the following description of the specific embodiments.

Example 1, as shown in fig. 1 to 4, a young's modulus dynamometry measuring frame for material property measurement includes a placing table 1, a master control box 2 is disposed at a top rear side position of the placing table 1, a young's modulus measuring instrument 6 is disposed at a top front side position of the placing table 1, a strain gauge sensor module 19 is disposed at a top rear side of the young's modulus measuring instrument 6, a strain gauge 7 is disposed on an inner surface of the strain gauge sensor module 19, a resistance box R23, a resistance box R34 and a resistance box R45 are disposed at one side of a top center of the placing table 1, a cushion block 11 is disposed at a front side bottom position of the placing table 1, a support frame 8 is fixedly connected to a top of the cushion block 11, and a plurality of resistance connection wires 18 are disposed at the top of the placing table 1.

The effect that its whole embodiment 1 reached does, the platform 1 of placing that sets up is convenient for realize placing of various devices, and realize the position adjustment of various equipment, the master control case 2 of setting is current differential amplifier, and there is the digital display table master control case 2 surface, be arranged in the voltage on the master control case in the comprehensive laboratory bench of display sensor system, and be provided with 15V power and 4V power in the master control case 2, the young modulus apparatus 6 that sets up adopts current YMC-1 type young modulus apparatus, a plurality of resistance connecting wire 18 that set up are convenient for couple together various equipment and form full bridge.

In embodiment 2, as shown in fig. 1 to 3, the periphery of the bottom of the cushion block 11 is respectively provided with an adjusting member 15 in a threaded manner, the position of the surface of the support frame 8 close to the bottom is slidably connected with the lifting block 10 in a penetrating manner, the positions of the two sides of the front surface of the lifting block 10 are provided with positioning bolts 14 in a threaded manner, the top center of the lifting block 10 is provided with a steel wire clamp 16 in a threaded manner, the rear end face of each positioning bolt 14 is slidably connected with the surface of the support frame 8, the bottom of the steel wire clamp 16 is provided with a weight tray 12, the surface of the weight tray 12 is slidably connected with a weight 13, the center of the inner top of the support frame 8 is provided with a metal wire 9, and the surface of the metal wire 9 is adhesively connected with a strain gauge resistor R117.

The effect that its whole embodiment 2 reached is, be convenient for realize the gradient adjustment of cushion 11 through rotatory regulating part 15, through the height of adjustment elevator gas, be convenient for when the quantity of weight 13 is more, guarantee that wire 9 can realize sufficient tensile, steel wire anchor clamps 16 adopt centripetal locking structure, be convenient for realize the locking of wire 9 bottom, weight dish 12 is convenient for place the weight 13 of different quantity and weight, foil gage resistance R117 pastes on the wire surface through 502 glue, be convenient for when the wire radial tension, the resistance size of real-time measurement wire 9.

The theory of operation, master control box 2 zeroing closely pastes foil gage resistance R117 on wire 9 with 502 glue, is connected foil gage R113 and resistance box R23, resistance box R34, resistance box R45 and foil gage sensor module 19 and master control box 2 with resistance connecting wire 18 for full bridge, bridge zeroing: properly reducing the gain Rw3 (rotating 3-4 circles clockwise, the potentiometer can rotate 5 circles clockwise at most), putting a weight 13 (each 1000 g) on a weight tray 12 to straighten the metal wire 9, connecting a bridge circuit power supply +/-4V (introduced from a main control box 2), simultaneously shifting a toggle switch at the upper left of a module to a direct current gear at the left (the direct current gear and the alternating current gear have different zero-adjusting resistance values), checking that the wiring is correct, closing a power switch of the main control box 2, adjusting the bridge zero-adjusting potentiometer Rw1 to display a digital display as zero, and specifically, the experiment principle is that the resistance R of the metal wire is in direct proportion to the length L of the metal wire and in proportion to the sectional area A of the metal wire, namely, the resistance R of the metal wire is in inverse proportion to the length L of the metal wire, namely, the sectional area A of the metal wire is 5 circles clockwise

After the metal wire 9 is stretched, it is stressed along its axial direction to deform, its length and cross-sectional area change accordingly, and its resistance value changes accordingly, so we can measure the mechanical quantity of strain of the metal wire 9 by measuring the electrical quantity of resistance change.

Differentiating the logarithm of formula 1

In equation 2

Expressed as axial strain epsilon for relative change in wire length, i.e.

Relative change in cross-sectional area. A = π r ² (r is the radius of the wire),

is the relative change of the radius of the metal wire, namely radial strain, the metal wire is axially extended and simultaneously radially reduced, so that the axial strain and the radial strain have the following relationship: epsilon _r And = -u epsilon (formula 3) mu is the poisson's ratio of the metal material.

According to the experiment, the relationship between the relative change of the resistivity of the metal material and the relative change of the volume thereof is as follows:

c is a constant of the metal material, such as copper wire C =1. From V = a × L, we can derive:

called the wire gage factor, the physical meaning is the relative change in resistance per unit strain. It can be seen that the wire is composed of two parts, the former part is caused by the change of the geometric dimension of the wire, the mu (Poisson ratio of the resistance wire material) of the general metal is about 0.3, so 1+2u ≈ 1.6, and the latter part is the part of which the resistivity changes with the strain, and is related to the characteristics of the metal itself besides the geometric dimension of the wire. Is constant over a range of strains for a metallic material, then yields:

therefore, the strain of the wire can be derived from equation (6) as long as the relative amount of change in the resistance of the wire is measured.

For measuring the relative variation of wire resistance, the foil gage sensor full-bridge is as shown in the figure (R1 is the foil gage of pasting on the iron wire, R2, R3, R4 are the resistance box) in full-bridge measuring circuit, inserts the electric bridge opposite side with two foil gages that the atress nature is the same, and the different access of atress direction is adjacent limit, when foil gage initial resistance: and R1= R2= R3= R4, and the bridge circuit outputs voltage when the change value is delta R1= delta R2= delta R3= delta R4. Its output sensitivity is doubled compared with that of half-bridge, and its non-linear error and temp error are both improved. The self-bridged full-bridge connection is shown in fig. 4:

we choose R1= R2= R3= R4

Representing bridge output voltage, R1, R2, R3 and R4 are resistances of four bridge arms of the bridge and are power supply output voltage, R1 is initial resistance of steel wire, if R1 changes, delta R1 is caused by delta R1<<R1 is derived from (7)

Thus is provided with

The young's modulus of the wire in combination with equation 6 can be expressed as:

wherein F represents a tensile force applied to both ends of the wire, S represents a cross-sectional area of the wire strain gauge resistor, Δ L represents a variation in the length of the wire, L represents an original length of the wire, and D represents a diameter of the wire. The diameter of a steel wire to be measured in a laboratory is 0.243mm, R1= R2= R3= R4=120 Ω, =4V, g 9.8 is taken, the steel wire is connected with a strain gage full bridge, and the Young modulus of the steel wire is obtained by measuring the voltage variation.

In order to express the relationship between the resistance change of the strain gauge and the strain of the test piece, the sensitivity coefficient K of the strain gauge is introduced and defined as: when the test piece is subjected to one-dimensional stress, if the main axis of the strain gauge is consistent with the stress direction, the resistance change rate of the strain gauge is

And strain in the principal stress direction of the test piece

The ratio of the two is called the sensitivity coefficient of the strain gauge, namely:

due to the influence of factors such as distortion of adhesive transmission deformation, transverse deformation of the strain gauge and the like, the sensitivity coefficient K of the strain gauge is always smaller than that of a strain gauge wire grid. The K value is given by the manufacturer, and the strain gage sensitivity coefficient K =7 for this experiment. Therefore, the strain of the tested piece can be obtained only by measuring the relative change of the resistance value of the strain gauge.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may apply the equivalent embodiments modified or modified by the above technical contents disclosed as equivalent variations to other fields, but any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a young's modulus dynamometry measuring frame of material properties survey, is including placing platform (1), its characterized in that: a main control box (2) is arranged at the rear side of the top of the placing table (1), a Young modulus tester (6) is arranged at the front side of the top of the placing table (1), a strain gauge sensor module (19) is arranged at the rear side of the top of the Young modulus tester (6), the inner surface of the strain gage sensor module (19) is provided with a strain gage (7), and one side of the top center of the placing table (1) is provided with a resistor box R2 (3), a resistor box R3 (4) and a resistor box R4 (5).

2. A young's modulus dynamometric frame for a material property measurement as defined in claim 1, wherein: the bottom of the front side of the placing table (1) is provided with a cushion block (11), and the top of the cushion block (11) is fixedly connected with a support frame (8).

3. A young's modulus dynamometric frame for a material property measurement as defined in claim 1, wherein: the top of the placing table (1) is provided with a plurality of resistance connecting lines (18).

4. A material property determination young's modulus dynamometric frame as defined in claim 2, wherein: and adjusting pieces (15) are respectively arranged on the periphery of the bottom of the cushion block (11) in a threaded penetrating manner.

5. A young's modulus dynamometric frame for a material property measurement as defined in claim 2, wherein: the surface of the support frame (8) is connected with a lifting block (10) in a penetrating and sliding manner at a position close to the bottom.

6. A material property determination Young's modulus dynamometric frame as claimed in claim 5, wherein: the lifting block is characterized in that positioning bolts (14) penetrate through the threads on the two sides of the front surface of the lifting block (10), and a steel wire clamp (16) penetrates through the threads on the center of the top of the lifting block (10).

7. The Young's modulus dynamometric frame of claim 6, wherein: the rear end face of the positioning bolt (14) is in sliding connection with the surface of the support frame (8).

8. The Young's modulus dynamometric frame of claim 6, wherein: the bottom of the steel wire clamp (16) is provided with a weight tray (12), and the surface of the weight tray (12) is connected with a weight (13) in a sliding manner.

9. A young's modulus dynamometric frame for a material property measurement as defined in claim 2, wherein: and a metal wire (9) is arranged at the center of the inner top of the support frame (8).

10. A young's modulus dynamometric frame for a material property measurement as defined in claim 9, wherein: and the surface of the metal wire (9) is bonded with a strain gauge resistor R1 (17).