JP5420480B2 - Tensile test apparatus and test method using the tensile test apparatus - Google Patents

Description

  The present invention relates to a tensile test apparatus used for performing a stress corrosion cracking test by applying a tensile force to a test piece, and a test method using the tensile test apparatus.

When steel pipes used for pipelines are placed in a corrosive environment, both stress and corrosion will act. As a method for testing a metal material in such an environment, there is a stress corrosion cracking test (SSC test) in which the metal material is exposed to a state close to its use environment.
For example, in the case of a steel pipe material test used for pipelines, it was determined by assuming the stress that would actually be applied in a test solution that was assumed to be a corrosive environment such as an oil field where the steel pipe was actually used. During the test period, a constant load is continuously applied to the test piece. The SSC test evaluates whether hydrogen gas accumulation caused by hydrogen atoms entering the steel pipe leads to breakage under conditions where a constant load is applied. The SSC test withstands the corrosive environment in which the steel pipe is actually used. This is a test to see if it can be done.

An example of such a stress corrosion cracking test method is a stress corrosion cracking test method described in Patent Document 1, for example.
The stress corrosion cracking test method described in Patent Document 1 is a stress corrosion cracking test method for evaluating the sensitivity of a metal material to stress corrosion cracking. A test part for evaluating stress corrosion cracking is provided, the test part is given a stress gradient, the tensile test piece is subjected to a tensile test at a constant strain rate, and the form and size of the crack in the test part for evaluating stress corrosion cracking, The stress intensity factor at which stress corrosion cracking occurs, the crack growth rate, and the sensitization degree of the material are evaluated from the depth distribution (see claim 1 of Patent Document 1).

  In the stress corrosion cracking test, it is necessary to apply a tensile force at a constant strain rate to the test piece. However, Patent Document 1 does not particularly show a specific device for applying stress.

On the other hand, as an apparatus for applying a tensile force to a test piece, there is an insulator-type static tensile load applying apparatus used in a high temperature creep test apparatus described in Patent Document 2, for example.
An insulator-type static tensile load applying device has one end of a test piece fixed to the gantry side of the device and the other end connected to a rod that applies a tensile force to the test piece by the action of the lever, and is attached to the tip of the rod. A tensile force is applied to the rod by hanging the weight.

However, the insulator type static tensile load application device has a problem that it is difficult to perform a test on a table because the device is large. Therefore, a tensile test apparatus using a proof ring is known as a desktop type small test apparatus.
FIG. 11 is an explanatory view showing an outline of the tensile test apparatus, and an outline of the tensile test apparatus 50 will be described based on FIG.
The tensile test apparatus 50 includes a gantry 51, a proof ring 3 installed on the gantry 51, a lower holding portion 7 and an upper holding portion 9 for holding the test piece 5 in the inner diameter direction in the proof ring 3. A tensile force applying rod 13 connected to the upper holding portion 9 and having a male screw portion and extending to the upper surface of the proof ring 3, and inserted through the tensile force applying rod 13 and installed on the upper surface of the proof ring 3. A bearing 53, a nut 17 screwed onto the male screw portion on the bearing 53, a test container 55 that encloses the solution and exposes the test piece to an exposure environment, and a displacement meter 57 that measures the displacement of the proof ring 3 I have.

In the proof ring type tensile test apparatus 50 configured as described above, a solution is sealed in a test container 55, the test piece 5 is exposed to a hydrogen environment, and a tensile force is applied to the test piece 5 in that state. .
The tensile force is applied by rotating the nut 17 as shown by the arrow in FIG. 11 to exchange force between the proof ring 3 and the test piece 5 to bend the proof ring 3 and restore it. A tensile force is applied to the test piece 5 by force. The lower surface of the nut 17 is in contact with the bearing 53 so as to be rotatable. When the nut 17 is rotated, the structure is such that, as a rule, no torsional force is applied to the test piece 5.
The relationship between the deflection of the proof ring 3 and the applied load is expressed as a linear calibration line, and each proof ring has a calibration characteristic.

JP 2000-275164 A JP-A-9-126973

As a function required in the tensile test apparatus, when a tensile load is applied to the test piece, only an axial load is applied to the test piece so that a torsional load is not generated.
However, in reality, no verification has been made as to what kind of torsional load is generated in the test piece. Therefore, it is unclear how effective the test results are.

  Therefore, an object of the present invention is to investigate what load is generated in the test piece when a tensile load is applied to the test piece using a conventional proof ring type tensile test device, and to the result of the investigation. Based on this, an object is to provide a mechanism for applying a load only in the axial direction to the test piece.

The inventor conducted an investigation for quantitatively grasping the amount of twist of the test piece generated at the time of applying a load and elucidating the mechanism leading to the breakage caused by the twist in the conventional proof ring type test apparatus.
Prepare a sample with a strain gauge in order to quantitatively grasp the amount of elongation and twist of the test piece generated by the stress acting on the test piece when a load is applied. Experimental evaluation was performed on the extensibility, (b) torsion, and (c) bendability by varying the load application method.

The experiment is based on a comparison between the lever type constant load method shown in Patent Document 2, which is a mechanism that is considered to have the least influence on torsion and bendability, and the conventional proof ring method that is the subject of the present invention. Evaluation was performed.
The experiment was conducted using the same sample with the same strain gauge in both systems.

As a result of the experiment, both of the methods were almost the same in terms of stretchability and bendability. Regarding the stretchability, the elongation amount was the same for both types if the load was the same, and none of the bendability at the time of load application occurred.
However, there is a significant difference in torsion, and the lion ring method shows a torsional strain of about 0.05% and hardly occurs, whereas the proof ring method shows a torsional strain of 0.3% or more. .
In addition, when reproducibility was confirmed by performing repeated measurement, the results were the same as above.
Furthermore, as a fact to support it, when observing the cross section of the test piece that was broken in a test using a proof ring type testing device, it was found that the shape of the fractured surface was often slanted, and that also In the case of the proof ring type, it was inferred that torsion was related.

The generation of a torsional strain of 0.3% or more means that a torsional stress exceeding the plastic region of the material is applied to the test piece, which greatly affects the fracture of the test piece. It is presumed that
From these experimental results, we found a problem with the conventional proof ring type test equipment, and that this problem, that is, to eliminate the torsion by the proof ring type test equipment, is effective in realizing an appropriate test. Obtained knowledge.
Therefore, we developed a proof ring-type test device to realize a mechanism that eliminates the occurrence of torsion with a proof ring.

<Development of a mechanism that does not cause bending or twisting when a load is applied>
The conventional proof ring type test apparatus applies a tensile force to the upper holding portion 9 and the test piece 5 by rotating and tightening the tightening nut 17 as shown by an arrow in FIG. This is a mechanism that bends the proof ring 3 using. Such tightening by rotation of the tightening nut 17 is considered to be a cause of twisting, and it was considered to drastically change the load application mechanism.

First, the method of fixing the grip of the upper holding part was considered. Conventionally, since it was a fixing method by a person, there was a difference between individuals and it was not a method that could stably eliminate torsion (at this stage, the amount of torsional strain is about 0.3%).
Next, the torsion was evaluated by a method in which the grip was fixed with a jig and the bearing was used on the upper part. As a result, torsion prevention by fixing the grip with a jig and escape of torsional stress by the bearing were improved, and the amount of torsional strain could be reduced from 0.3% to 0.2% or less.
However, the result was less than about 0.05% of the torsional strain obtained by the lever type. Furthermore, the bearing was also put in the lower part and an attempt was made to offset the amount of torsional distortion by the upper and lower bearings, but it did not reach 0.05%.

From the above examination results, it was considered that the generation of torsion cannot be eliminated by a mechanism that uses the rotation of a screw with a tightening nut to tighten. Therefore, as a new method of applying a load to solve this, as a result of further investigation to develop a compact jig that can withstand a large load of 2 t while applying a load by a method that does not rotate a screw. It came to complete.
The present invention has been made on the premise of the above various studies, and specifically comprises the following configurations.

(1) A tensile test apparatus according to the present invention includes a gantry, a proof ring installed on the gantry, a lower holding portion that holds a lower end side of the test piece in the proof ring, and an upper end side of the test piece. An upper holding portion for holding the tension member, a tensile force applying rod connected to the upper holding portion and extending to the upper surface of the proof ring, and a tensile force applying mechanism for applying an axial tensile force to the tensile force applying rod Have
The tensile force imparting mechanism includes a base installed on the upper surface of the proof ring, a slide member that is placed on the base and slides on the base, and is placed on the upper surface of the slide member. A block body arranged so as to apply an upward force in the axial direction to the tension applying rod;
A first inclined surface is formed on the upper surface of the slide member, and a surface that contacts the first inclined surface of the block body is a second inclined surface corresponding to the first inclined surface, and the slide member is slid. The block body can be moved in the axial direction of the tensile force applying rod.

(2) Further, in the above (1), the base has an insertion hole through which the tension applying rod is inserted, and the slide member is disposed so as to straddle the insertion hole. It is characterized by having two pieces.
By configuring the slide member from at least two pieces arranged so as to straddle the insertion hole, the pieces can be arranged symmetrically with respect to the tensile force applying rod, Therefore, it becomes easy to apply a stress equal to the left and right.

(3) Further, in the above (1) or (2), the base includes a slide groove on which the slide member slides.
By providing the slide groove, the slide operation of the slide member can be performed stably, which can contribute to preventing the force other than the axial direction from acting on the tension applying rod.

(4) Further, in any of the above (1) to (3), a screw portion is formed on an upper end portion of the tension applying rod, and a nut screwed to the screw portion is connected to the block body. It is characterized in that the contact can be made.
The position of the nut and the block body can be easily adjusted by the nut, and thereby the pushing amount of the slide member can be easily adjusted.

(5) Further, in any of the above (1) to (4), an insertion hole through which the tensile force applying rod is inserted is provided in the block body.
By providing the insertion hole in the block body, the block body can be evenly arranged on the left and right sides with respect to the tensile force applying rod, whereby the axial force can be easily applied from the block body to the tensile force applying rod.

(6) Moreover, in the thing in any one of said (1) thru | or (5), a standing piece part is provided in the one side of the said base, and the one side of the said block body is made to contact | abut to the said standing piece part. The stand piece is made to function as a stopper for restricting the movement of the block body in the lateral direction.
The whole apparatus can be made compact by providing a stand piece on the base and allowing the stand piece to function as a stopper.

(7) A tensile test method using the tensile test apparatus according to any one of (1) to (6), wherein a test is performed between the lower holding part and the upper holding part of the tensile test apparatus. A step of installing a piece and exposing a parallel portion of the test piece to an exposure environment; and a step of applying a tensile force to apply a tensile force to the test piece. A tensile force is applied to the test piece by pushing in a direction perpendicular to the force applying rod.

A tensile test apparatus according to the present invention holds a gantry, a proof ring installed on the gantry, a lower holding portion for holding a lower end side of the test piece in the proof ring, and an upper end side of the test piece. An upper holding portion, a tensile force applying rod which is connected to the upper holding portion and has an external thread on the upper end side and extends to the upper surface of the proof ring, and an axial tensile force is applied to the tensile force applying rod A tensile force applying mechanism, the tensile force applying mechanism comprising: a base installed on an upper surface of the proof ring; a slide member mounted on the base and sliding on the base; and the slide member And a block body disposed so as to apply an upward force in the axial direction to the tensile force applying rod, and forming a first inclined surface on the upper surface of the slide member , In the block body Since the surface contacting the inclined surface is a second inclined surface corresponding to the first inclined surface and the slide member is slid, the block body can be moved in the axial direction of the tensile force applying rod. By sliding the slide member, only the axial force can be applied to the tension applying rod without generating a twisting force.
As a result, the short-time fracture due to torsion (break within 100 hours), which was the cause of fracture in the proof ring type test, can be eliminated, and the cause of the fracture can be limited to the range of material characteristics instead of the test method. The accuracy can be dramatically improved.
In addition, if the tensile testing apparatus of the present invention has high test reliability for materials with high SSC sensitivity, such as new materials (eg, S13Cr) and new grades, variations in quality evaluation can be minimized. In addition, there is an effect that it is possible to prevent generation of useless costs by avoiding excessive manufacturing costs such as material design.

It is explanatory drawing of the tension test apparatus which concerns on one embodiment of this invention. It is a figure which expands and shows a part of FIG. It is a perspective view of the load application jig of the tensile testing device concerning one embodiment of the present invention. It is explanatory drawing of the component of the load addition jig shown in FIG. It is explanatory drawing of the other component of the load addition jig shown in FIG. It is explanatory drawing of the other component of the load addition jig shown in FIG. It is explanatory drawing which shows the state which looked at the component shown in FIG. 6 from the other angle. It is explanatory drawing of the other component of the load addition jig shown in FIG. It is explanatory drawing of the tension | tensile_strength provision method in the tension test apparatus which concerns on one embodiment of this invention. It is a graph which shows the result of the Example which confirms the effect of this invention. It is explanatory drawing of the conventional proof ring type tensile test apparatus.

A tensile test apparatus 1 according to the present embodiment will be described with reference to FIGS.
The tensile test apparatus 1 according to the present embodiment includes a gantry (not shown, see FIG. 11), a proof ring 3 installed on the gantry, and a lower side of the test piece 5 in the radial direction within the proof ring 3. A lower holding part 7 for holding the upper part, an upper holding part 9 for holding the upper side of the test piece 5, a male screw part 11 is formed on the upper end side connected to the upper holding part 9, and the upper surface of the proof ring 3 And a tensile force applying mechanism 15 for applying an axial tensile force to the tensile force applying rod 13.
Hereinafter, each configuration will be described in detail.

<Proof ring>
The proof ring 3 is a member that is installed on a gantry (not shown) and applies a tensile force to the test piece 5 installed in the inner diameter portion. That is, the proof ring 3 is bent by the tensile force applying rod 13 and a predetermined tensile force is applied to the test piece 5 by the restoring force.
The relationship between the deflection of the proof ring 3 and the acting load is expressed as a linear calibration line, and each proof ring has a calibration characteristic. This calibration characteristic is obtained in advance for each proof ring.

<Lower holding part>
As shown in FIG. 1, the lower holding portion 7 is a member that holds the lower side of the test piece 5 arranged in the inner diameter direction in the proof ring 3. A lower end side of the lower holding portion 7 is fixed to the proof ring 3.

<Upper holding part>
As shown in FIG. 1, the upper holding portion 9 is a member that holds the upper side of the test piece 5 arranged in the inner diameter direction in the proof ring 3. The upper end side of the upper holding part 9 is connected to a tension applying rod 13.

<Tensile force applying rod>
As shown in FIG. 2, the tensile force applying rod 13 extends to the upper surface of the proof ring 3, and a male screw portion 11 is formed on the upper end side thereof. A nut 17 that is screwed into the male screw portion 11 is installed in the male screw portion 11.
The tensile force applying rod 13 is applied with a tensile force in the axial direction by the tensile force applying mechanism 15.

<Tensile force application mechanism>
The tensile force applying mechanism 15 is installed on the upper surface of the proof ring 3 and applies an axial tensile force to the tensile force applying rod 13.
As shown in FIGS. 1 to 3, the tensile force applying mechanism 15 having such a function includes an L-shaped base 19 installed on the upper surface of the proof ring 3, and a substantially co-ordinate mounted on the base 19. It comprises a letter-shaped slide member 21 and a block body 23 placed on the upper surface 37 of the slide member 21.
Hereinafter, each member constituting the tensile force applying mechanism 15 will be described.

<Base>
As shown in FIG. 4, the base 19 is substantially L-shaped in a side view, and has a substantially rectangular bottom piece 25 and a standing piece that is arranged along one side of the bottom piece 25 and rises upward. A portion 27 is provided.
An insertion hole 29 through which the tensile force applying rod is inserted is formed in the approximate center of the bottom piece portion 25. In addition, two slide grooves 31 are formed on the upper surface of the bottom piece 25 to allow the slide member 21 to be placed and slide. The slide groove 31 is flat and finished by mirror polishing.
In the standing piece 27, a substantially rectangular member is screwed to the bottom piece 25. Two opening holes 33 are formed at the lower end portion of the upright piece portion 27 so as to straddle the slide groove 31. As shown in FIG. 1, the end of the slide member 21 can be inserted into the opening hole 33.

  Although the base 19 of the present embodiment is separately installed on the upper surface of the proof ring 3, the base of the present invention may be provided integrally with the proof ring 3 on the upper surface of the proof ring 3. .

<Sliding member>
The slide member 21 is a substantially U-shaped member that is placed on the base 19 and slides in a direction orthogonal to the tensile force applying rod 13. Each piece 35 of the slide member 21 is fitted in the slide groove 31 of the base 19 in a slidable state. The lower surface of the slide member 21 is finished by mirror polishing, and can slide smoothly along the slide groove 31.
The upper surface 37 of the slide member 21 is an inclined surface, and is inclined upward from the distal end side toward the proximal end side. That is, the slide member 21 is thin on the distal end side and thick on the proximal end side. The inclination angle of the inclined surface of the slide member 21 is preferably set so that the vertical movement of the block body 23 is obtained by 4 mm or more when the slide member is slid within the movable range.
The upper surface 37 of the slide member 21 is also finished by mirror polishing.

Although the slide member 21 of the present embodiment has a substantially U-shape when viewed in plan, the slide member 21 of the present invention is not limited to this. The shape may have a long hole. But it is preferable that the part arrange | positioned on both sides on both sides of the tension | tensile_strength provision rod 13 exists in a symmetrical position with respect to the tension | tensile_strength provision rod 13, and is the same shape. By doing in this way, the right and left equal force can be applied to the block body 23 with the tensile force applying rod 13 interposed therebetween.
The number of pieces 35 constituting the slide member 21 is not limited to two, and may be two or more even numbers such as four.

<Block body>
The block body 23 is a member having a substantially rectangular parallelepiped shape that is placed on the upper surface 37 of the slide member 21. In the center of the block body 23, an insertion hole 39 through which the tension applying rod 13 is inserted is formed.
A projecting portion 41 projecting downward is formed at the center of the lower surface of the block body 23, and the block body 23 is symmetrical with respect to the projecting portion 41.
As shown in FIG. 3, the protrusion 41 is inserted between the two pieces 35 of the slide member 21 and functions as a guide when the slide member 21 slides. That is, the protrusion 41 of the block body 23 is disposed between the two pieces 35 of the slide member 21 to prevent the block body 23 from moving in the direction intersecting the slide direction when the slide member 21 slides. doing. For this reason, when the slide member 21 slides, the block body 23 moves along the axial direction of the tension applying rod 13. This action contributes to preventing the twisting force applying rod 13 from generating a twisting force.
The lower surface 43 on both sides of the protrusion 41 on the lower surface of the block body 23 is an inclined surface having the same inclination as the inclined surface formed on the upper surface 37 of the slide member 21. The inclined surface formed on the block body 23 is also finished by mirror polishing.

A method for applying a tensile force to the test piece 5 by the tensile test apparatus 1 configured as described above will be described.
The test piece 5 is installed in the inner diameter direction of the proof ring 3 using the lower holding part 7 and the upper holding part 9. At this time, the tensile force applying rod 13 extends from the upper surface of the proof ring 3 as shown in FIG. The base 19 is installed on the upper surface of the proof ring 3 so that the insertion hole 29 of the base 19 is inserted into the extension portion of the tension applying rod 13. The slide member 21 is inserted into the slide groove 31 of the base 19 so that the tensile force applying rod 13 is disposed between each of the forked pieces 35 of the slide member 21, and the tip of the slide member 21 is inserted into the base 19. Is inserted into the opening hole 33 of the upright piece 27. Further, the insertion hole 39 of the block body 23 is inserted into the tension applying rod 13 and the block body 23 is placed on the upper surface 37 of the slide member 21 (see FIG. 2). At this time, the surface on one side of the block body 23 comes into contact with the inner surface of the standing piece portion 27 of the base 19, and the standing piece portion 27 of the base 19 functions as a stopper that stops the movement of the block body 23.
After the block body 23 is installed, as shown in FIG. 1, the nut 17 is screwed into the male thread portion 11 of the tension applying rod 13 so that the lower surface of the nut 17 is in light contact with the upper surface of the block body 23. To do.

  From the above state, the slide member 21 is pushed in by applying a load to the slide member 21 in the direction of the arrow shown in FIGS. When the slide member 21 is pushed in and moves in the direction of the arrow, the block body 23 tends to move upward. At this time, since the upper surface of the block body 23 is in contact with the lower surface of the nut 17, it acts to push up the nut 17. As a result, an upward force acts on the tensile force applying rod 13.

The force that pushes up the nut 17 by the movement of the slide member 21 acts equally in the axial direction of the tensile force applying rod 13 and in the left and right directions, so that a torsional force hardly acts as in the prior art.
The reaction force of the force that the block body 23 tries to push up the nut 17 acts on the block body 23 from the nut 17, and this force acts on the upper surface of the proof ring 3 via the slide member 21 and the bottom piece 25 of the base 19. To do. As a result, the proof ring 3 is bent.
When the proof ring 3 is bent, a tensile force acts on the test piece 5 by the restoring force. The tensile force acting at this time can be obtained by measuring the deflection of the proof ring 3 with a displacement meter as shown in FIG. 11, for example, and comparing the measured deflection amount with a calibration straight line.

  As a method of pushing the slide member 21 in the direction shown in FIGS. 1 and 2, a reaction force may be applied to the stand piece of the base 19 so as to push the proximal end side of the slide member 21. More specifically, a reaction force may be taken on the upright side of the base 19 to gradually push the base end side of the slide member 21 with a vise or the like.

A procedure for performing a stress corrosion cracking test using the tensile testing apparatus configured as described above will be described below.
(1) With the test piece set in the test container, install the test container in the center of the proof ring.
(2) In order to give a predetermined test load, the amount of deflection of the proof ring with respect to the load is determined from the calibration characteristics of the proof ring, and the proof ring is bent using the tensile test device of the present invention.
(3) A test solution defined in the standard is prepared, and degassing is performed for 24 hours using nitrogen gas in order to remove dissolved oxygen in the test solution. At the same time, the inside of the test container is deaerated.
(4) After injecting the test solution into the test vessel, hydrogen sulfide gas is blown to start the stress corrosion cracking test.
(5) The hydrogen sulfide gas is continuously supplied during a predetermined test period (30 days), and the test piece is checked for breakage.

In order to confirm the effect of the present invention, the amount of torsional strain of the test piece generated at the time of applying a load was quantitatively measured in the same manner as shown in the means for solving the above-described problems.
As comparative examples, three tests were carried out: an insulator type tensile tester (Comparative Example 1), a conventional proof ring type (Comparative Example 2), and an example of the present invention. The result of the experiment is shown in the graph of FIG. In the graph of FIG. 10, the vertical axis indicates the amount of torsional strain (%) generated in the parallel portion of the test piece, and the horizontal axis indicates the load load (kN).

  As can be seen from the graph of FIG. 10, according to the tensile test apparatus of the present invention, the amount of torsional strain generated when the applied load is 20 kN is about 0.02%, which is about half of 0.05% of the insulator type. Results were obtained.

From the above experimental results, according to the tensile test apparatus of the present invention, it is possible to eliminate the short-time fracture (rupture within 100 hours) caused by the torsion, which was the cause of the fracture by the test, and the cause of the fracture is not the test method but the material characteristics. It has been demonstrated that it can be limited to a range. As a result, yields such as disposal and remanufacturing due to failure of the test can be eliminated, which can contribute to profit improvement.
In addition, if the tensile testing device of the present invention has high reliability of testing even for other new materials (for example, S13Cr) and materials with high SSC sensitivity such as new grades, the evaluation of variation in quality should be minimized. Therefore, it is not necessary to spend excessive manufacturing costs such as material design, which can contribute to cost reduction in material design.

DESCRIPTION OF SYMBOLS 1 Tensile test apparatus 3 Proof ring 5 Test piece 7 Lower holding part 9 Upper holding part 11 Male thread part 13 Tensile force giving rod 15 Tensile force giving mechanism 17 Nut 19 Base 21 Slide member 23 Block body 25 Bottom piece part 27 Standing piece part DESCRIPTION OF SYMBOLS 29 Insertion hole 31 Slide groove 33 Opening hole 35 Single part 37 Upper surface 39 Insertion hole 41 Protrusion part 43 Lower surface 50 Conventional tension test apparatus 51 Base 53 Bearing 55 Test container 57 Displacement meter

Claims (7)

A gantry, a proof ring installed on the gantry, a lower holding portion for holding the lower end side of the test piece in the proof ring, an upper holding portion for holding the upper end side of the test piece, and an upper holding portion. A tensile force applying rod that is connected and extends to the upper surface of the proof ring; and a tensile force applying mechanism that applies an axial tensile force to the tensile force applying rod.
The tensile force imparting mechanism includes a base installed on the upper surface of the proof ring, a slide member that is placed on the base and slides on the base, and is placed on the upper surface of the slide member. A block body arranged so as to apply an upward force in the axial direction to the tension applying rod;
A first inclined surface is formed on the upper surface of the slide member, and a surface that contacts the first inclined surface of the block body is a second inclined surface corresponding to the first inclined surface, and the slide member is slid. Thus, the block body can be moved in the axial direction of the tensile force applying rod.   The base has an insertion hole through which the tension applying rod is inserted, and the slide member has at least two pieces arranged so as to straddle the insertion hole. The tensile test apparatus according to 1.   The tensile test apparatus according to claim 1, wherein the base includes a slide groove on which the slide member slides.   The screw part is formed in the upper end part of the said tension | tensile_strength provision rod, The nut screwed together to this screw part was contactable with the said block body, The Claim 1 thru | or 3 characterized by the above-mentioned. Tensile test equipment.   The tensile testing device according to any one of claims 1 to 4, wherein an insertion hole through which the tensile force applying rod is inserted is provided in the block body.   A standing piece is provided on one side of the base, and one surface of the block body is brought into contact with the standing piece so that the standing piece functions as a stopper for restricting the movement of the block body in the lateral direction. The tensile test apparatus according to any one of claims 1 to 5, wherein   A tensile test method using the tensile test apparatus according to any one of claims 1 to 6, wherein a test piece is installed between the lower holding part and the upper holding part of the tensile test apparatus and the test piece is A step of exposing the parallel part to an exposure environment; and a step of applying a tensile force to the test piece. The step of applying the tensile force includes the slide member in a direction perpendicular to the tensile force applying rod. A tensile test method, wherein a tensile force is applied to the test piece by pressing.

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