Tensile Test Method

Abstract

To provide a tensile test method capable of improving safety of a tensile test and improving work efficiency.SOLUTION: A tensile test method in an embodiment is a tensile test method for applying a tensile force to a specimen 1 by holding the specimen 1 by a chuck part 101 of a tensile test device 100. The method includes a holding step for holding a protrusion 3 of the specimen 1 formed with the protrusion 3 protruded in the cross direction crossing the tensile direction of a specimen body part 2; a holding step for holding the specimen body part 2 by the chuck part 101; and a tensile step for applying a tensile stress to the specimen body part 2.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a tensile test method. By law Regarding. [Background technology]

[0002] Patent Document 1 discloses a technology for improving the safety of tensile tests. The magnetic chuck of the tensile testing machine in Patent Document 1 has a magnetizing coil embedded in the back surface of the chuck blade that clamps the test piece, a controller that controls the current flow to the magnetizing coil, and is configured to pass current through the magnetizing coil when the test piece is attached. However, because the technology disclosed in Patent Document 1 uses a magnetizing coil, it is only applicable to metal test pieces.

[0003] In conventional tensile tests, if the test specimen is heavy enough to be held in one hand, one hand must be used to hold the specimen in place while the other hand operates the operating switch. At this time, the specimen must be held in place until both ends are clamped between the chuck blades with enough force to prevent the specimen from slipping when tension is applied, and the specimen is completely fixed.

[0004] However, with this conventional method, when clamping the test piece with the chuck blades, there is a risk that the fingertips holding the test piece may be pinched by the chuck blades. In particular, when the test piece is short or has an unusual shape that makes it difficult to hold, it is difficult to ensure safety during the work.

[0005] Furthermore, if the test specimen is heavy and must be held in place with both hands, the operator holding the specimen and another operator will have to operate the chuck activation switch, which could lead to miscommunication regarding the timing of clamping the specimen, increasing the risk of the work.

[0006] Patent Document 2 also discloses a broken test specimen recovery device in which a robot arm is driven horizontally by a horizontal drive device, and a gripping mechanism is advanced and retreated toward a test specimen attached to a testing machine. Furthermore, in the broken test specimen recovery device of Patent Document 2, the robot arm is moved along a vertical movement drive mechanism within a base. Therefore, the technology disclosed in Patent Document 2 has the drawbacks of being expensive to introduce a large device and requiring additional steps for setting up and removing the test specimen holding device before and after testing, which may reduce work efficiency.

[0007] The general procedure for setting up a test specimen for a tensile test is as follows: (1) With the upper and lower chucks open, the distance between them is longer than the overall length of the specimen. (2) The specimen is held in place by hand or with a specimen holding device. (3) The upper grip, which has a larger cross-section or greater strength than the test target portion of the specimen and will not yield or break under tension, is clamped by the upper chuck. Once the specimen is fixed, the hand or specimen holding device that was holding the specimen is released. (4) With the lower chuck still open, the lower grip is moved upward, and the lower grip, which has a larger cross-section or greater strength than the test target portion of the specimen and will not yield or break under tension, is clamped by the lower chuck, completely fixing the specimen.

[0008] In this installation procedure, if the test specimen is asymmetrical left and right or top and bottom, or if the test specimen has a large curvature and is therefore wide overall, the width of the entire test specimen will fit within the width of the top and bottom chucks when both the upper and lower chucks are open. However, if the test specimen in (2) above is clamped in the chuck only on the top side first, it may not fit within the width of the bottom chuck when step (4) above is performed.

[0009] The test piece 9 may be curved in the tensile direction as shown in Figures 14(a) and 14(a)(b), may be wavy as shown in Figures 14(c) and 14(d), or may be asymmetric in the tensile direction as shown in Figures 14(e) and 14(f).

[0010] In this case, instead of following the steps (1) to (4) above, first (1') as shown in Figures 14(a), 14(c), and 14(e), with the upper chuck 98 and the lower chuck 99 open, the test piece 9 is held so that the upper gripping portion 91 of the test piece 9 is between the left and right sides of the upper chuck 99 and the lower gripping portion 92 is between the left and right sides of the lower chuck 99. (2') The upper gripping portion 91 is clamped by the upper chuck 98. (3') The lower gripping portion 92 is clamped by the lower chuck 99.

[0011] However, in step (2') above, as shown in Figures 14(b), 14(d), and 14(f), when the upper gripping portion 91 is chucked by the upper chuck 98, the entire test piece 9 may move in a direction perpendicular to the test tensile direction (the direction of the width between the chucks). If the movement in the horizontal direction is large, the lower gripping portion 92 may come into contact with one side of the lower chuck 99. If the test piece 9 is held by hand to prevent the movement in the horizontal direction, there is an increased risk of fingers or other objects being pinched between the lower gripping portion 92 and the lower chuck 99 during step (2'), which is a problem. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Jikko No. 54-138690 [Patent Document 2] Jikko No. 54-40854 Summary of the Invention [Problem to be solved by the invention]

[0013] The present invention has been devised in view of the above circumstances, and its object is to provide a tensile test method that can improve the safety of tensile tests and improve work efficiency. The law The purpose is to provide. [Means for solving the problem]

[0014] A tensile testing method according to a first aspect of the present invention is a tensile testing method in which a test piece is clamped by a chuck part of a tensile testing device and a tensile force is applied to the test piece, and a protrusion part is formed on the test piece body part so as to protrude in a direction intersecting with the tensile direction. and asymmetric a holding step of holding the protruding portion of the test piece; and a step of clamping the test piece main body with a chuck portion. Then, the holding of the protrusion is released. and a tensioning step of applying a tension force to the test piece main body.

[0015] The tensile testing method according to the second invention is characterized in that, in the first invention, the protrusion has a shaft portion connected to the test piece main body portion and a widened portion that is wider than the shaft portion.

[0016] The tensile testing method according to the third invention is the same as that of the first or second invention, wherein the protrusions are formed on both sides of the test piece main body, and the holding step holds at least one of the plurality of protrusions.

[0017] The tensile testing method according to the fourth invention is any one of the first to third inventions, characterized in that the protrusions are formed in plurality and spaced apart in the tensile direction, and the holding step holds at least one of the plurality of protrusions.

[0018] A tensile testing method according to a fifth aspect of the present invention is the method of the fourth aspect, characterized in that the holding step holds a connecting portion that connects the plurality of protrusions.

[0019] A tensile testing method according to a sixth aspect of the present invention is characterized in that, in any one of the first to fifth aspects of the present invention, the holding step holds the protrusion with a hanging part for suspending the protrusion from above.

[0020] The tensile testing method according to the seventh invention is characterized in that, in any one of the first to fifth inventions, the holding step holds the protrusion with a support part for supporting the protrusion from below.

[0021] The tensile testing method according to the eighth invention is characterized in that, in any one of the first to seventh inventions, it includes a protrusion forming step of forming the protrusion on the test piece main body before the holding step, and the protrusion forming step is performed by cutting out the test piece main body and the protrusion from a single sheet of plate material.

[0022] The tensile testing method according to the ninth invention is any of the first to seventh inventions, characterized in that it includes a protrusion forming step of forming the protrusion on the test piece main body portion before the holding step, and the protrusion forming step is characterized in that the protrusion is attached to the test piece main body portion by welding.

[0023] The tensile testing method according to the tenth invention is any of the first to seventh inventions, further comprising a protrusion forming step of forming the protrusion on the test piece main body portion before the holding step, wherein the protrusion forming step comprises forming a threaded hole in the test piece main body portion and screwing the protrusion into the hole to attach it.

[0024] The tensile testing method according to an eleventh aspect of the present invention is any one of the first to seventh aspects of the present invention, further comprising a protrusion forming step of forming the protrusion on the test piece main body portion before the holding step, wherein the protrusion forming step is performed by attaching the protrusion to the test piece main body portion with an adhesive or a cement-based material.

[0025] The tensile testing method according to the twelfth invention is characterized in that, in any one of the first to fifth inventions, the holding step involves holding the protruding portion by hand, and the clamping step involves clamping the test piece main body by a chuck portion, and then releasing the protruding portion that has been held by hand. [Effects of the Invention]

[0027] First Invention to Third Invention 12 According to the invention, when clamping the test specimen body with the chuck, the operator can hold the protrusion. In other words, when clamping the test specimen body with the chuck, the operator's hand can be prevented from being pinched. This makes it possible to improve the safety of the tensile test. Furthermore, it is possible to improve the work efficiency of the tensile test without using a large holding device.

[0028] In particular, according to the second aspect of the present invention, the protrusion has a stem connected to the test piece body and a widened portion that is wider than the stem. For example, when an operator holds the protrusion in his / her hand, the widened portion makes it less likely to fall off. This improves the safety of the tensile test.

[0029] In particular, according to the third aspect of the present invention, the holding step involves holding at least one of the multiple protrusions 3 formed on both sides of the test strip body. This allows the operator to hold the protrusions with either the right hand, the left hand, or both hands. This makes it possible to stably hold the test strip.

[0030] In particular, according to the fourth aspect of the present invention, the holding step includes holding at least one of a plurality of protrusions spaced apart in the tensile direction, allowing the operator to hold the protrusions with either the right hand, the left hand, or both hands, thereby enabling the test piece to be stably held.

[0031] In particular, according to the fifth aspect of the present invention, the holding step holds the connecting portions that connect the multiple protrusions. This allows the operator to hold the connecting portions when holding the protrusions with their hands, for example. This makes it possible to stably hold the test strip.

[0032] In particular, according to the sixth aspect of the present invention, the holding step holds the protruding portion by a hanging portion that suspends the protruding portion from above. This eliminates the need for the operator to hold the test piece when the gripping portion is clamped by the chuck portion in the clamping step, further preventing the operator's hand from being pinched. This further improves the safety of the tensile test.

[0033] In particular, according to the seventh aspect of the present invention, the holding step holds the protruding portion with a support portion that supports the protruding portion from below. This eliminates the need for the operator to hold the test piece when the gripping portion is clamped by the chuck portion in the clamping step, further preventing the operator's hand from being pinched. This further improves the safety of the tensile test.

[0034] In particular, according to the eighth aspect of the present invention, the protrusion forming step involves cutting out the test piece body and the protrusion from a single plate material. This allows the test piece to be formed in a factory or the like, with the test piece body and the protrusion integrated in advance. This makes it possible to prevent the protrusion from falling off the test piece body.

[0035] In particular, according to the ninth aspect of the present invention, the protrusion forming step attaches the protrusion to the test piece body by welding. This allows the protrusion to be attached at any position, thereby further improving the safety of the tensile test.

[0036] In particular, according to the tenth aspect of the present invention, the protrusion forming step involves forming a threaded hole in the test piece body and screwing the protrusion into the hole. This allows the protrusion to be attached at any position, further improving the safety of the tensile test.

[0037] In particular, according to the eleventh aspect of the present invention, the protrusion forming step attaches the protrusion to the test piece body with an adhesive or a cement-based material. This allows the protrusion to be attached at any position, further improving the safety of the tensile test. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a side view showing an example of a tensile testing device and a test piece according to the first embodiment. [Figure 2] FIG. 2(a) is a front view showing an example of the test piece according to the first embodiment, and FIG. 2(b) is a side view showing an example of the test piece according to the first embodiment. [Figure 3] 3(a) and 3(b) are diagrams showing an example of a tensile test method according to the first embodiment. [Figure 4] FIG. 4(a) is a front view showing a first example of a test piece according to the second embodiment, and FIG. 4(b) is a front view showing a second example of a test piece according to the second embodiment. [Figure 5]FIG. 5 is a diagram showing an example of a test piece according to the third embodiment. [Figure 6] FIG. 6(a) is a front view showing a tensile testing apparatus and a first example of a test piece according to the fourth embodiment, and FIG. 6(b) is a side view showing a tensile testing apparatus and a first example of a test piece according to the fourth embodiment. [Figure 7] FIG. 7(a) is a front view showing a tensile testing apparatus and a second example of a test piece according to the fourth embodiment, and FIG. 7(b) is a side view showing a tensile testing apparatus and a second example of a test piece according to the fourth embodiment. [Figure 8] 8(a) and 8(b) are diagrams showing an example of a tensile test method according to the fourth embodiment. [Figure 9] FIG. 9(a) is a front view showing an example of a test piece according to the fifth embodiment, and FIG. 9(b) is a side view showing an example of a test piece according to the fifth embodiment. [Figure 10] FIG. 10(a) is a front view showing an example of a test piece according to the sixth embodiment, and FIG. 10(b) is a side view showing an example of a test piece according to the sixth embodiment. [Figure 11] 11(a) and 11(b) are diagrams showing an example of a tensile test method according to the sixth embodiment. [Figure 12] FIG. 12(a) is a front view showing an example of a test piece according to the seventh embodiment, and FIG. 12(b) is a side view showing an example of a test piece according to the seventh embodiment. [Figure 13] 13(a) and 13(b) are diagrams showing an example of a tensile test method according to the seventh embodiment. [Figure 14] 14(a) to 14(f) are diagrams showing an example of a conventional tensile test. DETAILED DESCRIPTION OF THE INVENTION

[0041] Hereinafter, embodiments of a tensile testing method, a tensile testing apparatus, and a test piece according to the present invention will be described in detail with reference to the drawings. In each drawing, the tensile direction is designated as Z, the direction intersecting the tensile direction Z is designated as a first direction X, and the direction intersecting the tensile direction Z and the first direction X is designated as a second direction Y.

[0042] (First embodiment: tensile testing apparatus 100, test piece 1) Fig. 1 is a side view showing an example of a tensile testing apparatus 100 according to the first embodiment and a test piece 1. Fig. 2(a) is a front view showing an example of the test piece 1 according to the first embodiment, and Fig. 2(b) is a side view showing an example of the test piece 1 according to the first embodiment.

[0043] The tensile tester 100 is used for a tensile test and applies a tensile force to a test piece 1. The tensile tester 100 clamps the test piece 1 with a chuck portion 101. The tensile tester 100 further includes a plurality of support columns 102.

[0044] The chuck portion 101 is held by a support 102 and is movable in the vertical direction. The chuck portion 101 has an upper chuck portion 101a and a lower chuck portion 101b.

[0045] The test piece 1 is made of, for example, metal, but may also be made of wood, concrete, or resin. The test piece 1 has a test piece main body 2 and a protruding portion 3.

[0046] The test piece 1 is formed, for example, in a flat plate shape. The test piece 1 may be formed, for example, in a cylindrical shape or in a curved shape. The test piece 1 may be asymmetric on both sides across the center in the tensile direction. The test piece 1 may be asymmetric on both sides across a cross direction that intersects the tensile direction.

[0047] The test piece main body 2 is formed, for example, in a dumbbell shape. The test piece main body 2 has a test object 21 to which a tensile force is applied by the tensile testing device 100, and a pair of gripping portions 22 arranged on either side of the test object 21 in the tensile direction. One gripping portion 22 is clamped by the upper chuck portion 101a, and the other gripping portion 22 is clamped by the upper chuck portion 101a.

[0048] The gripping portion 22 is formed, for example, in a plate shape, and has a pair of gripping surfaces 22a that come into contact with the chuck portion 101, side surfaces 22b connecting the pair of gripping surfaces 22a, and an end surface 22c formed in the pulling direction.

[0049] The protrusions 3 are formed to protrude in a direction intersecting the tensile direction of the test piece body 2. For example, a metal rod-shaped member is used for the protrusions 3, and they are attached to the gripping portion 22 by welding, for example. A plurality of protrusions 3 are formed on both sides of the test piece body 2. A plurality of protrusions 3 are formed spaced apart in the tensile direction. The protrusions 3 are formed on the side surface 22b of the gripping portion 22 and extend parallel to the clamping surface of the chuck portion 101. The protrusions 3 may also be formed on the gripping surface 22a of the gripping portion 22.

[0050] The protruding portion 3 may be attached to the gripping portion 22 with an adhesive or a cement-based material. Examples of the adhesive include a solvent-based adhesive. Examples of the cement-based material include cement paste, which is a mixture of cement such as ordinary Portland cement and water, and cement mortar, which further contains fine aggregate.

[0051] (First embodiment: tensile test method) Next, an example of a tensile test method according to the first embodiment will be described. In the tensile test method, a test piece 1 is clamped by a chuck 101 of a tensile tester 100, and a tensile force is applied to the test piece 1. The tensile test method includes a holding step, a clamping step, and a tension step. The tensile test method may further include a protrusion forming step, for example, before the holding step.

[0052] In the protrusion forming step, the protrusion 3 is formed on the test piece main body 2. In the protrusion forming step, the protrusion 3 is attached to the test piece main body 2 by welding.

[0053] Next, in the holding step, the protruding portion 3 of the test piece 1, which has been formed with the protruding portion 3 protruding in a direction intersecting the tensile direction of the test piece body 2, is held between the upper chuck portion 101a and the lower chuck portion 101b. In the holding step, the protruding portion 3 is held by the operator's hands.

[0054] The holding step involves holding at least one of the multiple protrusions 3 formed on both sides of the test piece body 2. This allows the operator to hold the protrusion 3 with either the right hand, the left hand, or both hands.

[0055] In the holding step, at least one of the plurality of protrusions 3 formed at intervals in the pulling direction is held, so that the worker can hold the protrusion 3 with either the right hand, the left hand, or both hands.

[0056] Next, in the clamping step, as shown in Figures 3(a) and 3(b), the test piece main body 2 is clamped by the chucks 101. In the clamping step, one gripping portion 22 is clamped by the upper chuck portion 101a, and the other gripping portion 22 is clamped by the lower chuck portion 101b. Thereafter, in the clamping step, the protruding portion 3 held by hand is released and released from the grip.

[0057] Next, in the tensile step, a tensile force is applied to the test piece body 2 by the tensile testing device 100. This completes one example of the tensile testing method.

[0058] According to this embodiment, the method includes a holding step of holding the protruding portion 3 of the test piece 1, which has a protruding portion 3 formed thereon that protrudes in a direction intersecting the tensile direction of the test piece body 2; a clamping step of clamping the test piece body 2 with the chuck portion 101; and a tensile step of applying a tensile force to the test piece body 2. This allows the operator to hold the protruding portion 3 when clamping the test piece body 2 with the chuck portion 101. In other words, it is possible to prevent the operator's hand from being pinched when clamping the test piece body 2 with the chuck portion 101. This makes it possible to improve the safety of the tensile test. Furthermore, it is possible to improve the work efficiency of the tensile test without using a large holding device.

[0059] According to this embodiment, the holding step involves holding at least one of the multiple protrusions 3 formed on both sides of the test strip body 2. This allows the operator to hold the protrusion 3 with either the right hand, the left hand, or both hands. This makes it possible to stably hold the test strip 1.

[0060] According to this embodiment, the holding step holds at least one of the multiple protrusions 3 formed at intervals in the tensile direction Z. This allows the operator to hold the protrusion 3 with either the right hand, the left hand, or both hands. This makes it possible to stably hold the test piece 1.

[0061] According to this embodiment, a protrusion forming step of forming the protrusion 3 on the test piece body 2 is performed before the holding step, and the protrusion 3 is attached to the test piece body 2 by welding. This allows the protrusion 3 to be attached at any position, which further improves the safety of the tensile test.

[0062] According to this embodiment, a protrusion forming step is provided in which the protrusion 3 is formed on the test piece body 2 before the holding step, and the protrusion 3 is attached to the test piece body 2 with an adhesive or a cement-based material. This allows the protrusion 3 to be attached at any position, which further improves the safety of the tensile test.

[0063] According to this embodiment, the test piece 1 is formed with a test piece body 2 and a protruding portion 3 that protrudes in a direction intersecting the tensile direction of the test piece body 2. This allows the operator to hold the protruding portion 3 when clamping the test piece body 2 with the chuck portion 101. In other words, when clamping the test piece body 2 with the chuck portion 101, it is possible to prevent the operator's hand from being pinched. This makes it possible to improve the safety of the tensile test. Furthermore, it is possible to improve the work efficiency of the tensile test without using a large holding device.

[0064] (Second embodiment: tensile testing device 100, test piece 1) FIG. 4(a) is a front view showing a first example of the test piece 1 according to the second embodiment, and FIG. 4(b) is a front view showing a second example of the test piece 1 according to the second embodiment.

[0065] As shown in FIG. 4, the protrusion 3 has a stem 31 and an expanded portion 32. The stem 31 is formed in a rod shape and has a base end connected to the test piece body 2 and a tip end opposite the base end. The tip end of the stem 31 has an expanded portion 32 that is wider than the stem 31. As shown in FIG. 4(a), multiple protrusions 3 may be formed on both sides of the test piece body 2. As shown in FIGS. 4(a) and 4(b), multiple protrusions 3 may be formed spaced apart in the tensile direction of the test piece body 2.

[0066] (Second embodiment: tensile test method) Next, an example of a tensile test method in the second embodiment will be described.

[0067] In the tensile test method, for example, a protrusion forming step is performed in the same manner as in the first embodiment.

[0068] Next, in the holding step, the protruding portion 3 of the test piece 1 is held, the protruding portion 3 being formed so as to protrude in a direction intersecting the tensile direction of the test piece main body 2. A widened portion 32 is provided at the tip of the protruding portion 3. This allows the protruding portion 3 to be caught on the widened portion 32 when the worker holds it, making it less likely for the test piece 1 to fall off.

[0069] Next, in the tensile test method, a clamping step and a tensioning step are performed, for example, in the same manner as in the first embodiment. With the above, one example of the tensile test method is completed.

[0070] According to this embodiment, the protruding portion 3 has a stem 31 connected to the test piece main body 2 and an expanded portion 32 that is wider than the stem 31. As a result, when an operator holds the protruding portion 3 in his / her hand, the expanded portion 32 makes it less likely for the protruding portion 3 to fall out of the operator's hand. This makes it possible to improve the safety of the tensile test.

[0071] (Third embodiment: tensile testing apparatus 100, test piece 1) FIG. 5 is a diagram showing an example of the test piece 1 according to the third embodiment.

[0072] The protrusions 3 are formed in a plurality and spaced apart in the tensile direction Z. The stem 31 is formed in a rod shape and has a base end connected to the test piece main body 2 and a tip end opposite the base end. The test piece 1 has a connecting portion 33 that connects the plurality of protrusions 3 spaced apart in the tensile direction.

[0073] (Third embodiment: tensile test method) Next, an example of a tensile test method in the third embodiment will be described.

[0074] In the tensile test method, for example, a protrusion forming step is performed in the same manner as in the first embodiment.

[0075] Next, in the holding step, the protruding portion 3 of the test piece 1 is held, the protruding portion 3 being formed in a direction intersecting the tensile direction of the test piece main body 2. In the holding step, the protruding portion 3 is held by the operator's hand.

[0076] In the holding step, at least one of the multiple protrusions 3 formed on both sides of the test piece main body 2 is held. In the holding step, the connecting portion 33 connecting the multiple protrusions 3 is held. This allows the operator to easily hold the test piece 1 with either the right hand, the left hand, or both hands.

[0077] Next, in the tensile test method, a clamping step and a tensioning step are performed, for example, in the same manner as in the first embodiment. With the above, one example of the tensile test method is completed.

[0078] According to this embodiment, the holding step holds the connecting portions 33 that connect the plurality of protrusions 3. This allows the operator to hold the connecting portions 33 when holding the protrusions 3 with their hands, for example. This makes it possible to hold the test piece 1 stably.

[0079] (Fourth embodiment: tensile testing apparatus 100, test piece 1) FIG. 6(a) is a front view showing a first example of a tensile testing apparatus 100 and a test piece 1 according to the fourth embodiment, and FIG. 6(b) is a side view showing a first example of a tensile testing apparatus 100 and a test piece 1 according to the fourth embodiment.

[0080] The tensile testing apparatus 100 includes a holding unit 103 that holds the protrusion 3 of the test piece 1. The holding unit 103 is installed, for example, in the tensile testing apparatus 100. The holding unit 103 may be installed in at least one of the upper chuck unit 101 and the lower chuck unit 101.

[0081] The holding portion 103 includes a support portion 104 that supports the protrusion 3 from below. This allows the protrusion 3 to be supported from below. The holding portions 103 are installed on both sides of the chuck portion 101. The support portions 104 may be installed on the floor, for example. The support portions 104 support the protrusion 3 formed on the lower gripping portion 22, for example, from below.

[0082] The support portion 104 has a flat base portion 104a on which the protrusion 3 is placed, and legs 104b that support the base portion 104a. The base portion 104a is formed in a plate shape. The protrusion 3 is placed on the upper surface of the base portion 104a. The upper surface of the base portion 104a is formed flat. The lower surface of the protrusion 3, which is also formed flat, is placed on the flat upper surface of the base portion 104a.

[0083] In the protruding portion 3, for example, the thickness t2 of the widened portion 32 is preferably greater than the plate thickness t1 of the gripping portion 22. This can increase the area that comes into contact with the base portion 104a.

[0084] Fig. 7(a) is a front view showing a second example of the tensile testing apparatus 100 and the test piece 1 according to the fourth embodiment, and Fig. 7(b) is a side view showing the second example of the tensile testing apparatus 100 and the test piece 1 according to the fourth embodiment. The support part 104 may support the protrusion 3 formed on the upper grip part 22 from below, for example.

[0085] (Fourth embodiment: tensile test method) Next, an example of a tensile test method in the fourth embodiment will be described.

[0086] In the tensile test method, for example, a protrusion forming step is performed in the same manner as in the first embodiment.

[0087] Next, in the holding step, the protruding portion 3 of the test piece 1 is held, the protruding portion 3 being formed in a direction intersecting the tensile direction of the test piece body 2. In the holding step, support portions 104 are placed on both sides of the test piece 1, sandwiching it therebetween. In the holding step, the protruding portion 3 formed on the lower grip portion 22 is held by the support portions 104 that support it from below.

[0088] Next, in the clamping step, as shown in Fig. 8(a), the test piece main body 2 is clamped by the chuck portion 101. In the clamping step, one gripping portion 22 is clamped by the upper chuck portion 101a, and the other gripping portion 22 is clamped by the lower chuck portion 101b. Thereafter, in the clamping step, as shown in Fig. 8(b), the installed support portion 104 is removed, and the holding is released.

[0089] Next, in the tensile test method, a tensile step is performed, for example, in the same manner as in Embodiment 1. With the above, one example of the tensile test method is completed.

[0090] According to this embodiment, in the holding step, the protruding portion 3 is held by the holding portion 103 for holding the protruding portion 3. As a result, when the gripping portion 22 is clamped by the chuck portion 101 in the clamping step, the operator does not need to hold the test piece 1 himself, and it is possible to prevent the operator's hand from being pinched. This makes it possible to improve the safety of the tensile test.

[0091] According to this embodiment, in the holding step, the protruding portion 3 is held by the support portion 104 that supports the protruding portion 3 from below. As a result, when the gripping portion 22 is clamped by the chuck portion 101 in the clamping step, the operator does not need to hold the test piece 1 himself, which further prevents the operator's hand from being pinched. This makes it possible to further improve the safety of the tensile test.

[0092] According to this embodiment, in the holding step, support parts 104 are installed on both sides of the chuck part 101. This allows the protruding parts 3 on both sides of the test piece 1 to be supported from below by the respective support parts 104, sandwiching the test piece 1. This makes it possible to hold the test piece 1 more stably.

[0093] According to this embodiment, the tensile testing apparatus 100 has a holding unit 103 for holding the protrusion 3. As a result, when the gripping unit 22 is clamped by the chuck unit 101 in the clamping step, the operator does not need to hold the test piece 1 himself, and it is possible to prevent the operator's hand from being pinched. This makes it possible to improve the safety of the tensile test. Furthermore, it is possible to improve the work efficiency of the tensile test without using a large holding device.

[0094] According to this embodiment, the tensile testing apparatus 100 has a support portion 104 for supporting the protruding portion 3 from below. This eliminates the need for the operator to hold the test piece 1 when the gripping portion 22 is clamped by the chuck portion 101 in the clamping step, further preventing the operator's hand from being pinched. This further improves the safety of the tensile test.

[0095] According to this embodiment, the tensile testing apparatus 100 has a support 104 for supporting the protrusion 3 from below, and the support 104 has a flat base 104a on which the protrusion 3 is placed and legs 104b that support the base 104a, and the lower surface of the protrusion 3 is formed flat. This allows the flat lower surface of the protrusion 3 to be placed on the upper surface of the flat base 104a. This makes it possible to hold the test piece 1 more stably.

[0096] (Fifth embodiment: tensile testing apparatus 100, test piece 1) FIG. 9(a) is a front view showing an example of the test piece 1 according to the fifth embodiment, and FIG. 9(b) is a side view showing an example of the test piece 1 according to the fifth embodiment.

[0097] The tensile testing apparatus 100 includes a holding unit 103 that holds the protrusion 3 of the test piece 1. The holding unit 103 is installed, for example, in the tensile testing apparatus 100. The holding unit 103 may be installed in either the upper chuck unit 101 or the lower chuck unit 101.

[0098] The holding unit 103 includes a hanging unit 105 for hanging the protruding unit 3 from above. This allows the protruding unit 3 to be hung and held from above. The hanging units 105 are installed on both sides of the chuck unit 101. The hanging units 105 may be installed by hanging from at least one of the chuck unit 101 and the support 102 of the tensile testing apparatus 100. The hanging units 105 may be installed on the ceiling above the tensile testing apparatus 100, for example.

[0099] (Fifth embodiment: tensile test method) Next, an example of a tensile test method in the fifth embodiment will be described.

[0100] In the tensile test method, for example, a protrusion forming step is performed in the same manner as in the first embodiment.

[0101] Next, in the holding step, the protruding portion 3 of the test piece 1 is held, the protruding portion 3 being formed in a direction intersecting the tensile direction of the test piece main body 2. In the holding step, holding portions 103 are placed on both sides of the test piece 1, sandwiching it therebetween. In the holding step, the protruding portion 3 is held by a hanging portion 105 that hangs it from above.

[0102] Next, in the clamping step, the test piece main body 2 is clamped by the chuck portion 101. In the clamping step, one gripping portion 22 is clamped by the upper chuck portion 101a, and the other gripping portion 22 is clamped by the lower chuck portion 101a. Thereafter, in the clamping step, the installed hanging portion 105 is removed, and the holding is released.

[0103] Next, in the tensile test method, a tensile step is performed, for example, in the same manner as in Embodiment 1. With the above, one example of the tensile test method is completed.

[0104] According to this embodiment, in the holding step, the protruding portion 3 is held by the hanging portion 105 that suspends and holds the protruding portion 3 from above. As a result, when the gripping portion 22 is clamped by the chuck portion 101 in the clamping step, the operator does not need to hold the test piece 1 himself, which further prevents the operator's hand from being pinched. This makes it possible to further improve the safety of the tensile test.

[0105] According to this embodiment, in the holding step, hanging parts 105 are installed on both sides of the chuck part 101. This allows the test piece 1 to be held by suspending the protruding parts 3 on both sides by the respective hanging parts 105, with the test piece 1 sandwiched between them. This makes it possible to hold the test piece 1 more stably.

[0106] According to this embodiment, the tensile testing apparatus 100 has a hanging portion 105 for suspending and holding the protruding portion 3 from above. This eliminates the need for the operator to hold the test piece 1 when clamping the gripping portion 22 with the chuck portion 101 in the clamping step, further preventing the operator's hand from being pinched. This further improves the safety of the tensile test.

[0107] (Sixth embodiment: tensile testing apparatus 100, test piece 1) FIG. 10(a) is a front view showing an example of the test piece 1 according to the sixth embodiment, and FIG. 10(b) is a side view showing an example of the test piece 1 according to the sixth embodiment.

[0108] The protrusion 3 is formed to protrude in a direction intersecting the tensile direction of the test piece body 2. The protrusion 3 is, for example, a metal rod-shaped member, and is attached by inserting it into a hole 23 formed in the side surface 22b of the gripping portion 22. The hole 23 has a threaded inner surface. The protrusion 3 is, for example, a bolt, and is formed so that it can be threaded into the hole 23. The bolt shaft 31 is threaded into the hole 23 in the protrusion 3. The protrusion 3 has a widened portion 32 formed by the head of the bolt.

[0109] (Sixth embodiment: tensile test method) Next, an example of a tensile test method in the sixth embodiment will be described.

[0110] In the protrusion forming step, a protrusion 3 is formed on the test piece main body 2. In the protrusion forming step, a threaded hole 23 is formed on the side surface 22b of the gripping portion 22 of the test piece main body 2, as shown in FIG. 11(a). In the protrusion forming step, the protrusion 3 is inserted into the hole 23 and attached, as shown in FIG. 11(b). In the protrusion forming step, the protrusion 3 is attached by screwing it into the threaded hole 23.

[0111] Next, in the tensile test method, a holding step, a clamping step, and a pulling step are performed, for example, in the same manner as in the first embodiment. With the above, one example of the tensile test method is completed.

[0112] According to this embodiment, in the protrusion forming step, a threaded hole 23 is formed in the test piece body 2, and the protrusion 3 is attached by screwing into the hole 23. This allows the protrusion 3 to be attached at any position, which further improves the safety of the tensile test.

[0113] (Seventh embodiment: tensile testing apparatus 100, test piece 1) FIG. 12(a) is a front view showing an example of the test piece 1 according to the seventh embodiment, and FIG. 12(b) is a side view showing an example of the test piece 1 according to the seventh embodiment.

[0114] The protruding portion 3 is formed so as to protrude in a direction intersecting the tensile direction of the test piece body 2. The protruding portion 3 is formed, for example, by cutting out the test piece body 2 from a single plate material when the test piece body 2 is cut out. The protruding portion 3 may also be formed by cutting out the widened portion 32 from a single plate material.

[0115] (Seventh embodiment: tensile test method) Next, an example of a tensile test method in the seventh embodiment will be described.

[0116] In the protrusion forming step, a protrusion 3 is formed on the test piece main body 2. In the protrusion forming step, as shown in Figures 13(a) and 13(b), a single plate material 10 is prepared, and the test piece main body 2 and the protrusion 3 are cut out from the single plate material 10 at a factory or the like that produces the test piece 1. In the holding step, when cutting out the protrusion 3 from the plate material 10, a widened portion 32 is also cut out and formed.

[0117] Next, in the tensile test method, a holding step, a clamping step, and a pulling step are performed, for example, in the same manner as in the first embodiment. With the above, one example of the tensile test method is completed.

[0118] According to this embodiment, the protrusion forming step involves cutting out and forming the test piece body 2 and the protrusion 3 from a single plate material 10. This allows the test piece 1 to be formed in advance in a factory or the like, with the test piece body 2 and the protrusion 3 integrated together. This makes it possible to prevent the protrusion 3 from falling off the test piece body 2.

[0119] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, the present invention can be embodied in various novel forms in addition to the above-described embodiments. Therefore, various omissions, substitutions, and modifications are possible in the above-described embodiments without departing from the spirit and scope of the present invention. Such novel forms and modifications are included within the scope and spirit of the present invention, as well as within the scope of the inventions set forth in the claims and equivalents of the inventions set forth in the claims. [Explanation of symbols]

[0120] 100: Tensile testing equipment 101: Chuck part 102: Strut 103: Holding part 104: Support part 105: Hanging part 1: Test piece 2: Test piece body 21: Test subject 22: Grip part 22a: Gripping surface 22b: Side 22c: End face 23 :hole 3:Protrusion 31: Shaft 32: Widening section 33: Joint 10: Plate material 9: Test piece holding device X: 1st direction Y: Second direction Z: Tensile direction

Claims

1. A tensile testing method in which a test piece is clamped by a chuck portion of a tensile testing device and a tensile force is applied to the test piece, a holding step in which a protrusion is formed in a direction intersecting the tensile direction of the test piece body portion and the asymmetric test piece is held; a clamping step of clamping the test piece main body with a chuck portion and then releasing the holding of the protruding portion; a tensioning step of applying a tension force to the test piece main body. A tensile test method comprising:

2. The protrusion has a stem portion connected to the test piece body and a widened portion that is wider than the stem portion.

2. The tensile test method according to claim 1, wherein:

3. The protrusions are formed on both sides of the test piece body, with a plurality of protrusions being formed on either side of the test piece body, The holding step includes holding at least one of the plurality of protrusions.

3. The tensile test method according to claim 1 or 2,

4. The protrusions are formed in a plurality of locations spaced apart from one another in the pulling direction, The holding step includes holding at least one of the plurality of protrusions. The tensile test method according to any one of claims 1 to 3, characterized by:

5. The holding step includes holding a connecting portion that connects the plurality of protrusions.

5. The tensile test method according to claim 4, wherein:

6. The holding step includes holding the protruding portion by a hanging portion for hanging the protruding portion from above. The tensile test method according to any one of claims 1 to 5,

7. The holding step includes holding the protrusion with a support portion for supporting the protrusion from below. The tensile test method according to any one of claims 1 to 5,

8. a protrusion forming step of forming the protrusion on the test piece body before the holding step, The protrusion forming step is performed by cutting out the test piece body and the protrusion from a single plate material. The tensile test method according to any one of claims 1 to 7, characterized by:

9. a protrusion forming step of forming the protrusion on the test piece body before the holding step, The protrusion forming step includes attaching the protrusion to the test piece body by welding. The tensile test method according to any one of claims 1 to 7, characterized by:

10. a protrusion forming step of forming the protrusion on the test piece body before the holding step, The protrusion forming step includes forming a threaded hole in the test piece body and screwing the protrusion into the hole. The tensile test method according to any one of claims 1 to 7, characterized by:

11. a protrusion forming step of forming the protrusion on the test piece body before the holding step, The protrusion forming step includes attaching the protrusion to the test piece body using an adhesive or a cement-based material. The tensile test method according to any one of claims 1 to 7, characterized by:

12. The holding step includes holding the protrusion by hand, In the clamping step, the test piece main body is clamped by a chuck, and then the protruding portion held by hand is released. The tensile test method according to any one of claims 1 to 5,

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