Material tester

Abstract

To limit a space where rupture pieces of a specimen are scattered to a space narrower than a test space.SOLUTION: A bending test machine 1 is configured to measure the mechanical characteristics of a test piece TP by deforming the test piece TP, and comprises: a roller support structure 13 that applies a test force to an upper surface of the test piece TP; an upper cover member 2 that is fixed to the roller support structure 13 and has an open lower surface; and a lower cover member 3 that is arranged below the upper cover member 2 so as to face the upper cover member 2 and has an open upper surface, where during bending test, the upper cover member 2 and the lower cover member 3 form a closed space that contains the test piece TP.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a material testing machine.

Background Art

[0002] In a material testing machine that deforms a specimen to measure the mechanical properties of the specimen, a technique for preventing fragments of the specimen from scattering outside the test space is known. For example, when the material testing machine is a tensile testing machine, the test space includes the specimen and is a space surrounded by a pair of columns, a table on which a lower gripper is arranged, and a crosshead on which an upper gripper is arranged. For example, Patent Document 1 discloses a scattering prevention cover configured as described below. That is, the scattering prevention cover includes a door portion in which a cover member is combined with an upper frame and a lower frame. The door portion is connected to a plate penetrating a support shaft via a link mechanism. By fixing the plate to the table, the door portion is attached to the load frame so as to be openable and closable. In this scattering prevention cover, as an opening / closing mechanism of the door portion, a link mechanism combining a four-bar link mechanism composed of four links of a table, a second arm, a third arm, and a lower frame with a linear motion of freedom by a slide rail and a slider fixed to the table via a plate is adopted.

[0003] In recent years, the number of cases where composite materials typified by CFRP (Carbon Fiber Reinforced Plastics) and GFRP (Glass Fiber Reinforced Plastic) are the subjects of material tests has been increasing. This is because these composite materials are high-strength and lightweight, and the number of application cases is increasing as a material to replace steel. For example, there is a case where carbon fiber carbon is used for a part of a vehicle, and the applied vehicle has achieved weight reduction, leading to a reduction in carbon dioxide emissions by reducing fuel consumption. A material testing machine is essential for the proper evaluation of these composite materials and has greatly contributed to the development of composite materials.

Prior Art Documents

Patent Documents

[0004] Patent Document 1 Japanese Patent Application Laid-Open No. 2019-100751 Summary of the Invention Problems to be Solved by the Invention

[0005] In the tensile testing machine described in Patent Document 1 and the like, it is possible to prevent the broken pieces of the specimen from scattering outside the test space, but the broken pieces scatter inside the test space. Therefore, the broken pieces may adhere to devices such as grippers arranged in the test space, which may cause malfunctions. In addition, the work of removing the broken pieces is time-consuming. In addition, glass materials and composite materials often have a rectangular shape with a large area depending on their use. When setting such a specimen on a testing machine, the specimen is set so that the testing machine and the specimen intersect when viewed from above. Since the specimen is larger than the testing machine, even if a conventional anti-scattering cover is arranged, it is impossible to close the cover, and it has been difficult to achieve anti-scattering.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide a material testing machine capable of restricting the space in which the broken pieces of the specimen scatter to a space narrower than the test space without using a door-type anti-scattering cover. Means for Solving the Problems

[0007] An aspect of the present invention is a material testing machine that deforms a specimen and measures mechanical properties of the specimen, including an upper jig that applies a test force to an upper surface of the specimen, an upper cover member that is fixed to the upper jig and has an opening at a lower surface, and a lower cover member that is arranged below the upper cover member so as to face the upper cover member and has an opening at an upper surface. During the execution of a material test, the upper cover member and the lower cover member form a closed space including the specimen, and relates to a material testing machine. Effects of the Invention

[0008] According to an aspect of the present invention, during the execution of a material test, the upper cover member and the lower cover member form a closed space including the specimen, so that the space where the fragments of the specimen scatter is limited to the closed space formed by the upper cover member and the lower cover member. Therefore, without using a door-type splash-proof cover, the space where the fragments of the specimen scatter can be limited to a space narrower than the test space. Thus, it is possible to suppress the possibility that fragments adhere to the equipment arranged in the test space and cause failures. Further, since the scattered fragments gather inside the lower cover member, the work of removing the fragments of the specimen can be facilitated. Also, by appropriately setting the sizes of the upper cover member and the lower cover member, it is possible to cope with a large specimen.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011] The bending testing machine 1 applies a test force to a test piece TP, which is a material to be tested, in accordance with an instruction from a control device (not shown) to conduct a bending test. The test force is a bending force. In this embodiment, a case where the bending test is a so-called "four-point bending test" will be described. The test piece TP corresponds to an example of a "specimen". The bending testing machine 1 corresponds to an example of a "material testing machine".

[0012] In each of FIGS. 1-6, for the purpose of explaining the structure of the bending testing machine 1, an X-axis, a Y-axis, and a Z-axis that are perpendicular to each other are shown. The Z-axis is parallel to the vertical direction, and the X-axis and the Y-axis are parallel to the horizontal direction. The X-axis is parallel to the front-rear direction of the bending testing machine 1, and the Y-axis is parallel to the left-right direction of the bending testing machine 1. The positive direction of the X-axis indicates the rear direction, the positive direction of the Y-axis indicates the right direction, and the positive direction of the Z-axis indicates the upward direction.

[0013] [1. Configuration of the tensile testing machine main body] First, with reference to FIG. 1, the structure of the bending testing machine 1 will be described. FIG. 1 is a front view showing an example of the configuration of the bending testing machine 1 according to an embodiment of the present invention. As shown in FIG. 1, the bending testing machine 1 includes a table 10, a pair of columns 11, and a crosshead 12, and has a gantry-shaped structure in a front view. The pair of columns 11 are erected on the floor surface in a state facing the vertical direction. The table 10 is disposed between the pair of columns 11. That is, the table 10 is disposed between one of the pair of columns 11, for example, the right column 11, and the other column 11, for example, the left column 11. The table 10 is supported by the right column 11 and the left column 11.

[0014] The crosshead 12 is supported so as to be movable up and down by, for example, a pair of hydraulic cylinders (not shown). Each of the pair of hydraulic cylinders is disposed inside each of the pair of columns 11, for example. The right hydraulic cylinder is disposed inside the right column 11. The left hydraulic cylinder is disposed inside the left column 11. The right hydraulic cylinder and the left hydraulic cylinder drive the crosshead 12 to move up and down in synchronization.

[0015] A roller support structure 13 is fixed to the crosshead 12. The roller support structure 13 presses against the upper surface of the test piece TP. The roller support structure 13 corresponds to an example of an "upper jig". The roller support structure 13 will be further described with reference to FIGS. 2 and 3.

[0016] A test piece support structure 14 is fixed to the table 10. The test piece support structure 14 supports the test piece TP. The test piece support structure 14 corresponds to an example of a "lower jig". The test piece support structure 14 will be further described with reference to FIGS. 2 and 3.

[0017] With the test piece support structure 14 supporting the test piece TP, when the roller support structure 13 descends, a bending force is applied to the test piece TP, and a bending test is performed. The test piece TP is made of, for example, materials such as glass and ceramics. Glass, ceramics, etc. are more likely to break compared to metals such as iron and aluminum. Therefore, in order to break the test piece TP, with the test piece TP being supported, the amount of pushing in by which the roller support structure 13 pushes the test piece TP downward is small.

[0018] The upper cover member 2 is fixed to the roller support structure 13. The upper cover member 2 is formed in a box shape with an open bottom surface. The upper cover member 2 is integrally molded from, for example, a plastic such as ABS (acrylonitrile, butadiene, styrene copolymer synthetic resin). By driving the crosshead 12 to move up and down, the upper cover member 2 moves up and down integrally with the roller support structure 13.

[0019] The lower cover member 3 is disposed below the upper cover member 2 so as to face the upper cover member 2. Also, the lower cover member 3 is formed in a box shape with an open top surface. The lower cover member 3 is composed of an upper stage member 31 and a lower stage member 32. The upper member 31 is disposed so as to overlap the lower member 32. The upper member 31 is formed in a box shape with an open upper surface and an open lower surface. The lower member 32 is formed in a box shape with an open upper surface. The lower member 32 accumulates the fragments scattered when the test piece TP breaks.

[0020] Next, with reference to FIGS. 2 and 3, the configurations of the roller support structure 13 and the test piece support structure 14 will be described. FIG. 2 is a side view showing an example of the configurations of the roller support structure 13 and the test piece support structure 14. FIG. 3 is a front view showing an example of the configurations of the roller support structure 13 and the test piece support structure 14. As shown in FIGS. 2 and 3, the roller support structure 13 is fixed to the crosshead 12 via the support shaft 121. The support shaft 121 fixes the roller support structure 13 to the crosshead 12. A load cell (not shown) is disposed between the upper end of the support shaft 121 and the crosshead 12. The load cell detects the pressing force with which the pair of pressing rollers 133 press the test piece TP.

[0021] The roller support structure 13 also includes a base 131, a pair of roller support members 132, and a pair of pressing rollers 133. The base 131 is formed in a substantially T shape and supports the pair of roller support members 132. The upper end of the base 131 is fixed to the lower end of the support shaft 121. A pair of roller support members 132 are fixed to both ends in the front-rear direction at the lower end of the base 131.

[0022] Each of the pair of roller support members 132 supports each of the pair of pressing rollers 133. Each of the pair of roller support members 132 is formed in a flat plate shape. Each of the pair of roller support members 132 is fixed to both side surfaces in the left-right direction of the base 131. Each of the pair of pressing rollers 133 is inserted through and fixed to the pair of roller support members 132. Each of the pair of pressing rollers 133 is formed in a substantially cylindrical shape. Each of the pair of pressing rollers 133 presses the test piece TP. Each of the pair of pressing rollers 133 shown by the two-dot chain line in Fig. 2 is a pair of pressing rollers 133 arranged at positions contacting the upper surface of the test piece TP.

[0023] The test piece support structure 14 includes a mounting member 141, a pair of fixing members 142, a pair of test piece support members 143, a pair of support rollers 144, and a pair of test piece support members 145. The mounting member 141 is fixed to the table 10 with screws, bolts, etc. On the upper surface of the mounting member 141, a pair of fixing members 142 are fixed at both front and rear ends in the longitudinal direction. Each of the upper and lower surfaces of the mounting member 141 is formed in a rectangular plate shape.

[0024] Each of the pair of fixing members 142 is fixed at both front and rear ends in the longitudinal direction on the upper surface of the mounting member 141. Each of the pair of fixing members 142 is formed in a substantially L shape and supports the pair of test piece support members 143. Each of the pair of test piece support members 143 is formed in a flat plate shape. Each of the pair of test piece support members 143 is fixed to both left and right side surfaces of each of the pair of fixing members 142. Each of the pair of test piece support members 143 supports the pair of support rollers 144.

[0025] Each of the pair of support rollers 144 is inserted through and fixed to the pair of test piece support members 143. Each of the pair of support rollers 144 is formed in a substantially cylindrical shape. Each of the pair of support rollers 144 supports the lower surface of the test piece TP. The pair of test piece support members 145 support both left and right side surfaces of the test piece TP at both front and rear ends in the longitudinal direction of the test piece TP.

[0026] As shown in Fig. 2, the test piece support structure 14 is arranged to project in the front-rear direction with respect to the column 11. In other words, in the bending tester 1 shown in Figs. 1 - 3, the test piece support structure 14 is arranged to project in the front-rear direction from the test space. Therefore, in the bending tester 1, it is difficult to arrange a scattering prevention cover for preventing the broken pieces of the test piece TP from scattering from the test space to the outside.

[0027] [2. Structure of the Cover] Next, with reference to FIGS. 4 and 5, the structures of the upper cover member 2 and the lower cover member 3 will be described. FIG. 4 is a side view showing an example of the structures of the upper cover member 2 and the lower cover member 3. FIG. 5 is a front view showing an example of the structures of the upper cover member 2 and the lower cover member 3. In FIGS. 4 and 5, the states of the upper cover member 2 and the lower cover member 3 during the execution of the bending test are shown. That is, during the execution of the bending test, the upper cover member 2 and the lower cover member 3 form a closed space including the test piece TP. The lower part of the upper cover member 2 is arranged along the inner edge of the upper part of the lower cover member 3 so as to form a closed space.

[0028] The upper cover member 2 has an upper cover body 21 and an upper cover fixing member 22. The upper cover body 21 is formed in a box shape with an open lower surface. The upper cover member 2 is integrally formed of a plastic such as ABS, for example. The upper cover member 2 is formed of a transparent plastic such as ABS. A hole through which the support shaft 121 is inserted is formed at the center of the upper surface of the upper cover body 21. The upper cover fixing member 22 is a member that fixes the upper cover body 21 to the roller support structure 13. The upper cover fixing member 22 is arranged at the upper end of the upper cover body 21 and fixes the upper cover body 21 to the roller support structure 13 with screws, bolts, etc. A hole through which the support shaft 121 is inserted is formed in the upper cover fixing member 22.

[0029] The lower cover member 3 includes an upper stage member 31 and a lower stage member 32. The upper stage member 31 has an upper stage frame member 311, an upper stage cover body 312, and a handle member 313. The upper stage frame member 311 is arranged on each of the 12 sides when the upper stage member 31 is a rectangular parallelepiped, that is, the 4 sides forming the upper rectangle, the 4 sides forming the lower rectangle, and the 4 sides arranged on the side surface, and suppresses the deformation of the box shape of the upper stage member 31. The upper stage frame member 311 is formed of aluminum or the like, for example. The upper stage frame member 311 arranged at the lower end of the upper stage member 31 fits into the lower stage frame member 321 arranged at the upper end of the lower stage member 32.

[0030] The upper cover body 312 constitutes the four side surfaces of the upper member 31. The upper cover body 312 is a plate-shaped member that is fitted into the upper frame member 311. The upper cover body 312 is formed of a plastic such as transparent ABS. The handle member 313 is a member that a user grips when attaching and detaching the upper member 31 to and from the lower member 32. The handle member 313 is fixed to the upper frame member 311 disposed at the upper end of the upper member 31. Two handle members 313 are respectively arranged on the right side and the left side of the upper member 31, and one handle member 313 is respectively arranged on the front side and the rear side of the upper member 31.

[0031] The lower member 32 includes a lower frame member 321, a lower cover body 322, a handle member 323, and a fixing member 324. The lower frame member 321 is arranged on each of the 12 sides when the lower member 32 is in the shape of a rectangular parallelepiped, that is, the four sides forming the upper rectangle, the four sides forming the lower rectangle, and the four sides arranged on the side surfaces, and suppresses the deformation of the box shape of the lower member 32. The lower frame member 321 is formed of, for example, aluminum or the like. The lower frame member 321 disposed at the upper end of the lower member 32 is fitted to the upper frame member 311 disposed at the lower end of the upper member 31.

[0032] The lower cover body 322 constitutes the four side surfaces and the bottom surface of the lower member 32. The lower cover body 322 is a plate-shaped member that is fitted into the lower frame member 321. The lower cover body 322 is formed of a plastic such as transparent ABS. The handle member 323 is a member that a user grips when lifting the lower member 32. The handle member 323 is fixed to the lower frame member 321 disposed at the upper end of the lower member 32. Two handle members 323 are respectively arranged on the right side and the left side of the lower member 32, and one handle member 323 is respectively arranged on the front side and the rear side of the lower member 32. The fixing member 324 is a member for fixing the lower member 32 to the table 10. The fixing member 324 fixes the lower frame member 321 disposed at the lower end of the lower member 32 to the table 10 with bolts or the like.

[0033] [State of the bending testing machine during execution of the bending test] Next, with reference to FIGS. 6 and 7, the state of the bending testing machine 1 during execution of the bending test will be described. FIG. 6 is a side view showing an example of the state of the bending testing machine 1 during execution of the bending test. FIG. 7 is a front view showing an example of the state of the bending testing machine 1 during execution of the bending test. In FIGS. 6 and 7, for the sake of easy viewing of the roller support structure 13 and the test piece support structure 14, the description of the upper cover member 2 and the lower cover member 3 arranged on the front side of the figure is omitted. Also, in FIGS. 6 and 7, the test piece TP is supported by a pair of support rollers 144, and a pair of pressing rollers 133 are in contact with the upper surface of the test piece TP.

[0034] As shown in FIGS. 6 and 7, the lower cover member 3 is fixed to the table 10, and the upper cover member 2 is fixed to the roller support structure 13. Then, as the crosshead 12 descends, the roller support structure 13 fixed to the crosshead 12 descends via the support shaft 121. And the pressing roller 133 provided in the roller support structure 13 presses the upper surface of the test piece TP.

[0035] Also, the lower part of the upper cover member 2 is arranged along the inner edge of the upper part of the lower cover member 3 so as to form a closed space including the test piece TP. In other words, the test piece TP and the test piece support structure 14 are arranged inside the lower cover member 3, and the lower part of the upper cover member 2 fits into the opening formed in the upper part of the lower cover member 3. The upper part of the lower cover member 3 and the lower part of the upper cover member 2 maintain a predetermined gap, and the lower part of the upper cover member 2 fits into the opening formed in the upper part of the lower cover member 3. The size of the predetermined gap is determined according to the size of the fragments of the test piece TP after the test piece TP is broken.

[0036] When the size of the fragments of the test piece TP after the test piece TP is broken is, for example, 3 mm or more and 50 mm or less, the size of the predetermined gap is determined to be, for example, 2 mm. That is, the size of the predetermined gap is determined to be smaller than the minimum value of the size of the fragments of the test piece TP after the test piece TP is broken. In addition, as the bending test progresses, the upper cover member 2 descends, so the volume of the closed space formed by the upper cover member 2 and the lower cover member 3 decreases. Therefore, in order to keep the pressure in the closed space constant, it is preferable that the size of the predetermined gap be large. That is, the size of the predetermined gap is determined to be smaller than, for example, the minimum value of the size of the fragments of the test piece TP after the test piece TP is broken and as large as possible.

[0037] [4. Configuration and Operational Effects of Bending Testing Machine According to Present Embodiment] As described with reference to FIGS. 1-7, the bending testing machine 1 according to the present embodiment is a bending testing machine 1 that deforms a test piece TP and measures the mechanical properties of the test piece TP, and includes a roller support structure 13 that applies a test force to the upper surface of the test piece TP, an upper cover member 2 that is fixed to the roller support structure 13 and has an opening on the lower surface, and a lower cover member 3 that is disposed below the upper cover member 2 so as to face the upper cover member 2 and has an opening on the upper surface. During the execution of the bending test, the upper cover member 2 and the lower cover member 3 form a closed space including the test piece TP.

[0038] In this way, it includes an upper cover member 2 that is fixed to the roller support structure 13 and has an opening on the lower surface, and a lower cover member 3 that is disposed below the upper cover member 2 so as to face the upper cover member 2 and has an opening on the upper surface. During the execution of the bending test, the upper cover member 2 and the lower cover member 3 form a closed space including the test piece TP. Therefore, without using a door-type splash-proof cover, the space where the broken pieces of the test piece TP scatter can be restricted to a space narrower than the test space. Therefore, it is possible to suppress the possibility that the broken pieces adhere to the equipment arranged in the test space and cause a failure. In addition, since the scattered broken pieces gather inside the lower cover member 3, the work of removing the broken pieces of the test piece TP can be facilitated. Also, by appropriately setting the sizes of the upper cover member 2 and the lower cover member 3, it is possible to cope with a large test piece TP.

[0039] In addition, in the bending testing machine 1, during the execution of the bending test, the lower part of the upper cover member 2 is arranged along the inner edge of the upper part of the lower cover member 3 so as to form a closed space, and the upper cover member 2 moves up and down integrally with the roller support structure 13. Therefore, the broken pieces of the test piece TP scattered upward descend along the inner surface of the upper cover member 2 and gather inside the lower cover member 3. Accordingly, the work of removing the broken pieces of the test piece TP can be facilitated.

[0040] In addition, in the bending testing machine 1, the bending test is a test for deforming the test piece TP until the test piece TP breaks, and the size of the gap between the upper cover member 2 and the lower cover member 3 is determined according to the size of the fragments of the test piece TP after the test piece TP breaks. Therefore, since the size of the gap between the upper cover member 2 and the lower cover member 3 is determined according to the size of the fragments of the test piece TP after the test piece TP breaks, the size of the gap between the upper cover member 2 and the lower cover member 3 can be appropriately determined. For example, by determining the size of the gap between the upper cover member 2 and the lower cover member 3 to be smaller than the minimum value of the size of the fragments of the test piece TP, it is possible to suppress the scattered fragments of the test piece TP from scattering outside through the gap between the upper cover member 2 and the lower cover member 3. Accordingly, it is possible to suppress the possibility that the broken pieces adhere to the equipment arranged in the test space and cause a failure. In addition, since the scattered broken pieces gather inside the lower cover member 3, the work of removing the broken pieces of the test piece TP can be facilitated.

[0041] In addition, in the bending testing machine 1, the upper cover member 2 is formed in a box shape with an open lower surface, and the lower cover member 3 is formed in a box shape with an open upper surface. Therefore, the upper cover member 2 and the lower cover member 3 can be easily formed.

[0042] In addition, in the bending testing machine 1, in each of the upper cover member 2 and the lower cover member 3, at least the front member is formed to be transparent. Therefore, through the transparent front member, the user can visually recognize the progress state of the bending test.

[0043] [5. Aspects and Effects] Those skilled in the art will understand that the above-described embodiments are specific examples of the following aspects.

[0044] (Item 1) A material testing machine according to one aspect is a material testing machine that deforms a specimen and measures mechanical properties of the specimen, and includes an upper jig that applies a test force to an upper surface of the specimen, an upper cover member that is fixed to the upper jig and has an opening at a lower surface, and a lower cover member that is disposed below the upper cover member so as to face the upper cover member and has an opening at an upper surface. During execution of a material test, the upper cover member and the lower cover member form a closed space including the specimen.

[0045] According to the material testing machine described in Item 1, it includes an upper cover member that is fixed to the upper jig and has an opening at a lower surface, and a lower cover member that is disposed below the upper cover member so as to face the upper cover member and has an opening at an upper surface. During execution of a material test, the upper cover member and the lower cover member form a closed space including the specimen. Therefore, without using a door-type splash-proof cover, the space where the fragments of the specimen scatter can be limited to a space narrower than the test space. Therefore, it is possible to suppress the possibility that fragments adhere to the equipment arranged in the test space and cause failures. In addition, since the scattered fragments gather inside the lower cover member, the work of removing the fragments of the specimen can be facilitated. Also, by appropriately setting the sizes of the upper cover member and the lower cover member, it is possible to handle large specimens.

[0046] (Item 2) In the material testing machine according to Item 1, during execution of the material test, a lower portion of the upper cover member is disposed along an inner edge of an upper portion of the lower cover member so as to form the closed space, and the upper cover member moves up and down integrally with the upper jig.

[0047] According to the material testing machine described in claim 2, the fragments of the specimen scattered upward descend along the inner surface of the upper cover member and gather inside the lower cover member. Therefore, the operation of removing the fragments of the specimen can be facilitated.

[0048] (Claim 3) In the material testing machine described in claim 1 or claim 2, the material test is a test for deforming the specimen until the specimen breaks, and the size of the gap between the upper cover member and the lower cover member is determined according to the size of the fragments of the specimen after the specimen breaks.

[0049] According to the material testing machine described in claim 3, since the size of the gap between the upper cover member and the lower cover member is determined according to the size of the fragments of the specimen after the specimen breaks, the size of the gap between the upper cover member and the lower cover member can be appropriately determined. For example, by determining the size of the gap between the upper cover member and the lower cover member to be smaller than the minimum value of the size of the fragments of the specimen, it is possible to suppress the fragments of the specimen from scattering outside through the gap between the upper cover member and the lower cover member. Therefore, it is possible to suppress the fragments from adhering to the equipment arranged in the test space and causing a failure. In addition, since the scattered fragments gather inside the lower cover member, the operation of removing the fragments of the specimen can be facilitated.

[0050] (Claim 4) In the material testing machine described in claim 1 or claim 2, the upper cover member is formed in a box shape with an open lower surface, and the lower cover member is formed in a box shape with an open upper surface.

[0051] According to the material testing machine described in claim 4, the upper cover member and the lower cover member can be easily formed.

[0052] (Claim 5) In the material testing machine described in claim 1, in each of the upper cover member and the lower cover member, at least the front member is formed to be transparent.

[0053] According to the material testing machine described in claim 5, the user can visually recognize the progress of the material test through the front member formed transparently.

[0054] [6. Other Embodiments] In an embodiment of the present invention, the case where the "material testing machine" is the bending testing machine 1 will be described, but the embodiments of the present invention are not limited thereto. The "material testing machine" may be, for example, a tensile testing machine. Also, the "material testing machine" may be, for example, a compression testing machine.

[0055] Further, in an embodiment of the present invention, the roller support structure 13 is arranged on the crosshead 12 and the test piece support structure 14 is arranged on the table 10, but the embodiments of the present invention are not limited thereto. For example, the roller support structure 13 may be arranged on the rod of the hydraulic cylinder and the test piece support structure 14 may be arranged on the table 10.

[0056] Also, in an embodiment of the present invention, the bending test is executed by raising and lowering the crosshead 12 on which the roller support structure 13 is arranged, but the embodiments of the present invention are not limited thereto. For example, a tensile test may be executed by raising and lowering the test piece support structure 14 with the roller support structure 13 fixed.

[0057] Further, in an embodiment of the present invention, the upper cover member 2 is formed in a box shape with an open lower surface, and the lower cover member 3 is formed in a box shape with an open upper surface, but the embodiments of the present invention are not limited thereto. For example, the lower cover member 3 may be formed in an inverted frustum of a square pyramid shape with an open upper surface. In this case, the scattered fracture pieces can be collected on the bottom surface of the lower cover member. Therefore, the work of removing the fracture pieces of the specimen can be facilitated.

[0058] In addition, in the embodiment of the present invention, the upper cover main body 21 of the upper cover member 2, the upper-stage cover main body 312 of the lower cover member 3, and the lower-stage cover main body 322 are formed of a plastic such as transparent ABS, but the embodiment of the present invention is not limited thereto. In each of the upper cover member 2 and the lower cover member 3, at least the front member may be formed transparently.

[0059] In addition, in the embodiment of the present invention, the lower cover member 3 includes an upper-stage member 31 and a lower-stage member 32, but the embodiment of the present invention is not limited thereto. For example, the upper-stage member 31 and the lower-stage member 32 may be integrally formed.

[0060] Note that the bending tester 1 according to the embodiment of the present invention is merely an example of the aspect of the "material tester" according to the present invention, and can be arbitrarily deformed and applied without departing from the gist of the present invention.

Explanation of reference numerals

[0061] 1 Bending tester (material tester) 10 Table 11 Support column 12 Crosshead 13 Roller support structure (upper jig) 133 Pressing roller 14 Specimen support structure (lower jig) 144 Support roller 145 Specimen support member 2 Upper cover member 21 Upper cover main body 3 Lower cover member 31 Upper-stage member 312 Upper-stage cover main body 32 Lower-stage member 322 Lower-stage cover main body TP Specimen (test specimen)

Claims

1. A materials testing machine that deforms a specimen and measures the mechanical properties of the specimen, comprising: an upper jig that applies a test force to the upper surface of the specimen; an upper cover member fixed to the upper jig and having an open lower surface; a lower cover member disposed below the upper cover member so as to face the upper cover member and having an open upper surface; wherein during the execution of a materials test, the upper cover member and the lower cover member form a closed space including the specimen; a materials testing machine.

2. During the execution of the materials test, the lower part of the upper cover member is disposed along the inner edge of the upper part of the lower cover member so as to form the closed space, and the upper cover member moves up and down integrally with the upper jig. The materials testing machine according to Claim 1.

3. The materials test is a test that deforms the specimen until the specimen breaks, and the size of the gap between the upper cover member and the lower cover member is determined according to the size of the fragments of the specimen after the specimen breaks. The materials testing machine according to Claim 1 or Claim 2.

4. The upper cover member is formed in a box shape with an open lower surface, and the lower cover member is formed in a box shape with an open upper surface. The materials testing machine according to Claim 1 or Claim 2.

5. In each of the upper cover member and the lower cover member, at least the front member is formed to be transparent. The materials testing machine according to Claim 1.

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