Strength testing device

Abstract

A strength testing apparatus is provided that can investigate the strength corresponding to the crushing position of the test specimen. The strength testing apparatus (1) is an apparatus for performing a strength test by applying pressure to the test specimen (5) between the base (3) and the slide (4) of the stamping machine (2). The strength testing apparatus (1) includes: a mounting fixture (6) on which the test specimen (5) is mounted; and a flat plate fixture (7) mounted on the slide (4) and having a contact surface (7a) for the test specimen (5) to abut against the opposite side of the mounting fixture (6). In addition, the strength testing apparatus (1) includes: a load measuring unit (10) clamped between the slide (4) and the flat plate fixture (7) and measuring the compressive load (P) applied to the test specimen (5); a displacement measuring unit (20) measuring the position of the slide (4); and a data accumulation unit that outputs the compressive load (P) measured by the load measuring unit (10) in association with the position of the slide (4) measured by the displacement measuring unit (20).

Description

Technical Field

[0001] This invention relates to a strength testing device. Background Technology

[0002] Previously, as a mold load measuring device, there is a known device that arranges multiple load sensors (load sensors) in a grid pattern between the upper mold and the sliding lower surface of the mold (see Patent Document 1, etc.).

[0003] In this case, the load acting on the die during stamping is measured by a load sensor. This determines whether a load exceeding the permissible value is acting on the die, thus preventing die breakage.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 58-128797 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In recent years, there have been occasional requirements to conduct destructive tests on large structures that cannot be contained in compression testing equipment in order to determine load-bearing capacity, etc.

[0009] However, conventional die load measuring devices measure the strength of dies used in stamping machines. Therefore, further improvements are needed to pressurize and flatten test pieces (workpieces) of various shapes, such as large structures, and to thoroughly examine whether the required strength is present at the flattened location.

[0010] The purpose of this invention is to provide a strength testing device capable of investigating the strength corresponding to the crush location of the test specimen.

[0011] Solution for solving the problem

[0012] The strength testing apparatus of the present invention is a device for performing a strength test by applying pressure to a test specimen between the base and the slide of a stamping machine. The strength testing apparatus includes: a mounting fixture on which the test specimen is mounted; and a flat plate fixture mounted on the slide, having a contact surface for the test specimen to abut against the opposite side of the mounting fixture. Furthermore, the strength testing apparatus includes a load measuring unit clamped between the slide and the flat plate fixture, which measures the compressive load applied to the test specimen. Additionally, the strength testing apparatus includes a displacement measuring unit for measuring the position of the slide, and a data accumulation unit for correlating the compressive load measured by the load measuring unit with the position of the slide measured by the displacement measuring unit.

[0013] The effects of the invention

[0014] According to the present invention, a strength testing apparatus is provided that is capable of investigating the strength of a test specimen. Attached Figure Description

[0015] Figure 1 This is a perspective view illustrating the basic structure of the strength testing apparatus according to Embodiment 1 of the present invention.

[0016] Figure 2 The structure of the strength testing apparatus of Embodiment 1 is shown from... Figure 1 The side view viewed in the direction of arrow II.

[0017] Figure 3 The structure of the strength testing apparatus of Embodiment 1 is shown from... Figure 1 The top view viewed in the direction of arrow III.

[0018] Figure 4 The structure of the strength testing apparatus of Embodiment 1 is shown from... Figure 1 The side view viewed in the direction of arrow IV.

[0019] Figure 5 This is a perspective view of the test specimen measured using the strength testing apparatus of Embodiment 1.

[0020] Figure 6 This indicates that the strength test apparatus of Embodiment 1 was used to measure the strength. Figure 5 The FS graph of the results for the test specimen is shown.

[0021] Figure 7 This is a perspective view illustrating the situation where other test specimens are mounted on the strength testing apparatus of Embodiment 2.

[0022] Figure 8 This indicates that the strength test apparatus of Embodiment 2 was used to measure the strength. Figure 7 The FS graph of the results for the test specimen is shown. Detailed Implementation

[0023] Hereinafter, the strength testing apparatus 1 according to an embodiment of the present invention will be described with appropriate reference to the accompanying drawings.

[0024] like Figure 1 As shown, the strength testing apparatus 1 of Embodiment 1 is an apparatus that uses a stamping machine 2 to apply pressure to the test specimen 5 to perform a strength test.

[0025] The stamping machine 2 causes the upper slider 4 to slide relative to the lower base 3 in an approaching or receding direction. Moreover, in the case of performing a normal stamping process, the raw material is clamped between a die mounted on the base 3 and the slider 4, and the raw material is compressed in the vertical direction to perform the stamping process.

[0026] The strength testing apparatus 1 of embodiment 1 uses a stamping machine 2 to perform destructive tests on large structures (test specimens 5) that cannot be housed in a general compression tester, and to determine load-bearing capacity, etc.

[0027] Therefore, the strength testing apparatus 1 includes: a mounting fixture 6, which replaces the mold used in the stamping process, and mounts the test specimen 5 on the base 3; and a flat plate fixture 7, which is mounted on the slider 4 and has an abutment surface 7a for the test specimen 5 to abut against the opposite side of the mounting fixture 6.

[0028] The mounting fixture 6 has a base body 6b mounted on a flat plate on the base 3 and block-shaped stoppers 6a fixedly disposed at the four corners of the base body.

[0029] In addition, the flat plate clamp 7 is composed of a flat plate component that is roughly rectangular and flat when viewed from above. For example... Figure 2 As shown, a flat abutment surface 7a is formed on the lower surface of the flat plate clamp 7. The upper end of the test specimen 5 abuts against the center of the abutment surface 7a.

[0030] Furthermore, the strength testing device 1 includes: a load measuring unit 10, which is clamped between the slider 4 and the plate clamp 7 to measure the compressive load applied to the test specimen 5; and a displacement measuring unit 20 to measure the position of the slider 4.

[0031] The load measuring unit 10 of the strength testing apparatus 1 has four load sensors 11. Each load sensor 11 is disposed between the lower side of a flat plate mounting plate member 4a mounted on the lower surface side of the slider 4 and the upper side of a flat plate clamp 7. The mounting plate member 4a is detachably fixed to the lower surface side of the slider 4 by means of bolts or the like.

[0032] like Figure 3 As shown, in the strength testing apparatus 1 of Embodiment 1, four load sensors 11 are arranged in a ring at equal intervals around the central portion of the contact surface 7a, and each load sensor 11 is arranged in pairs at approximately equal distances from the test specimen 5.

[0033] Thus, with the press machine 2 open and the slider 4 positioned above, the flat plate fixture 7 is horizontally suspended below the mounting plate member 4a fixed to the slider 4 via four load sensors 11.

[0034] Therefore, as Figure 4 As shown, a space is formed between the flat plate clamp 7 mounted on the slider 4 and the mounting clamp 6 placed on the base 3, which is capable of clamping large test specimens 5 that cannot be stored in a typical compression tester.

[0035] Furthermore, in the strength testing apparatus 1 of Embodiment 1, a displacement measuring unit 20 for measuring the vertical position of the slider 4 is provided above the slider 4 (see reference). Figure 1 ).

[0036] The displacement measuring unit 20 in Embodiment 1 includes a laser displacement meter 21. The laser displacement meter 21 can measure the vertical position of the slider 4 by irradiating a laser beam from above to below on the upper surface side of the slider 4.

[0037] In addition, such as Figure 2 As shown, the strength testing apparatus 1 includes a data accumulation unit 8. The data accumulation unit 8 is connected to both the load measuring unit 10 and the displacement measuring unit 20.

[0038] In Embodiment 1, the data accumulation unit 8 uses the load F measured by the load measuring unit 10 as the stress of the test specimen 5 to generate load-displacement data associated with the sliding position S of the slider 4 measured by the displacement measuring unit 20. Here, the sliding position S of the slider 4 is the same as the deformation dimension of the test specimen 5. Furthermore, the data accumulation unit 8 calculates the load-displacement data based on the generated load-displacement data, for example... Figure 6 As shown, the FS graph, with the vertical axis representing the load F and the horizontal axis representing the sliding position (displacement) S, is output from a monitor or printer.

[0039] Next, the strength testing apparatus 1 using Embodiment 1 was subjected to the following test: Figure 5 The effect of the test specimen 5 with its complex shape as shown in the figure on the strength test will be explained.

[0040] In Embodiment 1, the test specimen 5 for strength measurement is integrally composed of a long dimension portion 5b having a length in the vertical direction and a short dimension portion 5a having a shorter vertical dimension than the long dimension portion 5b, which is placed on the upper surface of the mounting fixture 6.

[0041] Furthermore, a roughly rectangular flat plate 5c is pre-welded to the lower end surfaces of the short portion 5a and the long portion 5b of the test specimen 5. The flat plate 5c is detachably fixed to the upper surface of the base body 6b in the mounting fixture 6 provided on the base 3 by means of bolts or the like.

[0042] In Embodiment 1, the test specimen 5, which undergoes a strength test, is positioned in the front-back and left-right directions such that the upper end of the long portion 5b of the test specimen 5 abuts against the center portion of the contact surface 7a provided on the flat plate clamp 7. Thus, the test specimen 5 (refer to...) is placed stably on the upper surface of the mounting clamp 6. Figure 1 Even if it is crushed and developed, it is difficult to tilt in the forward, backward, left, or right directions.

[0043] In the strength testing apparatus 1 of Embodiment 1, a space is formed between the flat plate clamp 7 and the mounting clamp 6, which is capable of clamping a large test specimen 5. Figure 5 The test specimen 5, which has a complex shape as shown, can be clamped between the base 3 and the slider 4 with the length direction of the long part 5b aligned with the vertical direction of the applied compressive load P.

[0044] In this way, the space for setting the test specimen 5 in the strength testing apparatus 1 can be set to be relatively large. Therefore, the shape of the mounting fixture 6 can be changed so that the orientation of the test specimen 5 is consistent with the direction in which the compressive load P is applied. Therefore, it is possible to measure the mechanical properties such as load-bearing capacity of the test specimen 5 under various directions when it is stable on the mounting fixture 6.

[0045] In the strength test of Embodiment 1, the slider 4 slides downward toward the base 3, as shown. Figure 2 or Figure 4 As shown, the central portion of the contact surface 7a of the flat plate clamp 7 abuts against the upper end face of the long dimension portion 5b of the test specimen 5. The compressive load P of the slider 4 is transmitted from the mounting plate member 4a through each load sensor 11 and the flat plate clamp 7 to the test specimen 5, and applies pressure to the test specimen 5 in the vertical direction between it and the mounting clamp 6 placed on the base 3.

[0046] The compressive load P of the stamping machine 2 is preferably set to a value that is typical for stamping operations or smaller than the typical value, within the range of compressive load P that can be output by a 1,000-ton stamping machine. Furthermore, the load speed is set to a constant speed, for example, about 10 mm / s, during movement in the sliding direction.

[0047] When a compressive load P is applied and pressure is applied between the base 3 and the slider 4, stress is generated in the test specimen 5. The stress is distributed in all directions from the central part of the flat plate clamp 7, which abuts against the upper end face of the long dimension 5b of the test specimen 5, and is transmitted approximately evenly to each load sensor 11 of the load measuring unit 10, and is measured as load F.

[0048] At this time, in the strength testing apparatus 1 of Embodiment 1, at the start of compression, the upper end of the long dimension portion 5b of the test specimen 5 abuts against the center portion of the contact surface 7a, suppressing movement in the forward, backward, left, and right directions. Therefore, even if crushing occurs, the positional shift is minimal, and the distance to each load sensor 11 arranged in pairs across the test specimen 5 hardly changes.

[0049] Furthermore, the load speed is set to a constant speed, for example, about 10 mm / s, during the sliding direction. Therefore, the upper end of the elongated portion 5b continuously abuts against the contact surface 7a, preventing the test specimen 5 from tipping over. Consequently, the load F transmitted via the flat plate clamp 7 is evenly distributed and measured approximately equally by the various load sensors 11 arranged around it.

[0050] The load F measured by the load measuring unit 10 is the stress of the test specimen 5, representing its strength. Therefore, the loads F measured by each load sensor 11 are collected in the data accumulation unit 8 and totaled, thereby enabling the measurement of the strength of the test specimen 5.

[0051] Furthermore, the load sensors 11 of the strength testing device 1 in Embodiment 1 are arranged in a ring at equal intervals.

[0052] Therefore, when stress is applied from the test specimen 5 to the plate clamp 7, the plate clamp 7 remains horizontal and approaches the mounting plate member 4a fixed to the slider 4 evenly in plane. This further homogenizes the load F measured by each load sensor 11, thereby improving measurement accuracy.

[0053] Then, the strength testing device 1 causes the mounting plate component 4a of the slider 4 to abut against the stop 6a, thereby stopping the downward movement and ending the strength measurement of the test specimen 5.

[0054] like Figure 2 As shown, the displacement measuring unit 20 uses the laser displacement meter 21 to measure the vertical position of the slider 4 and sends it as measurement data to the connected data accumulation unit 8. The data accumulation unit 8 uses the measured vertical slider position S of the slider 4 as the deformation size caused by the deformation of the test specimen 5.

[0055] Then, the data accumulation unit 8 outputs the load F measured by the load measuring unit 10 in association with the sliding position S based on the measurement data measured by the displacement measuring unit 20. Thus, it is possible to investigate the strength corresponding to the deformation size in the flattening direction, which indicates the crushing condition of the test specimen 5.

[0056] In detail, the data accumulation unit 8 of Embodiment 1 captures the load F measured by the load measuring unit 10 as the stress of the test specimen 5 and generates load-displacement data associated with the sliding position S of the slider 4 measured by the displacement measuring unit 20.

[0057] The data accumulation unit 8 outputs, for example, the generated load-displacement data from a monitor or printer. Figure 6 The FS line graph shown.

[0058] exist Figure 6 The FS line graph shown illustrates... Figure 5 The measurement results of test specimen 5, which has a complex shape as shown.

[0059] As can be seen from the FS graph, the load F increases and decreases repeatedly as the crushing progresses at the sliding position S. Therefore, the strength corresponding to the crushing position of the test specimen 5 can be investigated. Furthermore, the mechanical properties can be analyzed from the FS graph based on the inclination of the FS line or the area of ​​the inner side enclosed by the FS line. In particular, by analyzing the measurement results of the test specimen 5 with a complex shape as described in Embodiment 1, mechanical properties such as load-bearing capacity corresponding to the development of the crushing can be obtained.

[0060] Thus, in the strength testing apparatus 1 of Embodiment 1, destructive tests can be performed on large test specimens 5 that cannot be housed in a typical compression tester, and load-bearing capacity can be measured to evaluate the strength of the test specimen 5.

[0061] Furthermore, the laser displacement gauge 21 of Embodiment 1 can measure the position of the slider 4 without contacting it. Since no external force is applied to the slider 4, the measured load F is not affected. Therefore, the strength testing device 1 can more accurately measure the load F corresponding to the crushing position of the test specimen 5.

[0062] Moreover, such as Figure 1 As shown, the laser displacement meter 21 of this embodiment can measure the vertical position from above the slider 4. Therefore, even if part of the test sample 5 is scattered due to crushing, it will be blocked by the slider 4 and will not reach the laser displacement meter 21. Thus, damage to the laser displacement meter 21 can be prevented.

[0063] In addition, such as Figure 4 As shown, in Embodiment 1, the strength testing apparatus 1 has a shield 30 with a transparent sheet installed on one or more sides of the outer side of the stamping machine 2. The shield 30 isolates the area between the base 3 and the slider 4 from the external area. Therefore, even if a part of the test specimen 5 is crushed and scattered, it will not reach the surrounding measuring equipment due to the presence of the shield 30, thus preventing damage to the measuring equipment.

[0064] Figure 7 The structure of the strength testing apparatus 101 in Embodiment 2 is shown. Furthermore, parts that are the same as or equivalent to the strength testing apparatus 1 in Embodiment 1 are labeled with the same reference numerals, and the description focuses on the different parts.

[0065] In Embodiment 2, the bending strength of the rod-shaped test specimen 25 is measured. The test specimen 25 of Embodiment 2 has a generally T-shaped end 25b and another end 25c integrally connected to both ends of a straight main shaft portion 25a. Therefore, the strength testing apparatus 101 includes a mounting clamp 26 that stably mounts the test specimen 25 on the base 3.

[0066] The mounting fixture 26 mainly has a first mounting fixture 26a that supports one end 25b of the test specimen 25 from below and a second mounting fixture 26b that supports the other end 25c of the test specimen 25 from below.

[0067] Furthermore, the mounting fixture 26 has a flat fixture base plate 26c. The fixture base plate 26c is fixed in such a way that it becomes integral with the first mounting fixture 26a and the second setting fixture 26b when the first mounting fixture 26a and the second setting fixture 26b are separated by a certain distance. Moreover, the fixture base plate 26c is fixed to the base 3 by bolts or the like.

[0068] Therefore, when conducting a strength test, if the test specimen 25 is placed on the mounting fixture 26, one end 25b is supported by the first mounting fixture 26a, and the other end 25c is supported by the second mounting fixture 26b. Furthermore, a space of a desired size that allows for bending deformation is formed below the main shaft portion 25a connecting one end 25b and the other end 25c.

[0069] In this state, the test specimen 25, placed on the mounting fixture 26, is supported at one end 25b and the other end 25c, and is placed stably on the base 3.

[0070] Furthermore, a pressing part 27 is provided protruding from the center on the lower surface side of the flat plate clamp 7 mounted on the slider 4. This pressing part 27 abuts against the main shaft portion 25a of the test specimen 25 placed on the mounting clamp 26 and presses downward. In Embodiment 2, the lower end 27a of the pressing part 27 is configured to abut against the upper surface of the middle portion 25d of the main shaft portion 25a in the longitudinal direction, applying a load from above to below.

[0071] In the strength test of Embodiment 2, if the slider 4 is moved downward, the lower end of the pressing part 27, which protrudes downward from the flat plate clamp 7, comes into contact with the middle part of the main shaft part 25a of the test specimen 25 and begins to press downward.

[0072] When test specimen 25 is pressurized between base 3 and slider 4, such as Figure 7 As shown by the imaginary line, the test specimen 25 deforms the main shaft portion 25a downwards, bending it into a "く" shape. The stress of the test specimen 25 is evenly transmitted to each load sensor 11 of the load measuring unit 10 via the flat plate clamp 7, and is measured as the load F.

[0073] Furthermore, the vertical position of the slider 4 is measured in the displacement measuring unit 20. Then, in the data accumulation unit 8, the load F measured by the load measuring unit 10 and the sliding position S of the slider 4 measured by the displacement measuring unit 20 are output in relation to each other. Thus, the relationship between the load and displacement of the test specimen 5 can be investigated.

[0074] exist Figure 8 The FS line graph shown illustrates, as Figure 7 The results of the bending strength measurement of the rod-shaped test specimen 25 shown are as follows. As can be seen from the FS graph, the load F temporarily increases and then decreases as the crushing progresses corresponding to the sliding position S. Furthermore, by analyzing the measurement results of test specimens 5 of various shapes and sizes, mechanical properties such as load-bearing capacity corresponding to the development of deformation and crushing can be obtained.

[0075] Other structures and effects are the same as in Implementation Method 1, so descriptions are omitted.

[0076] Thus, the strength testing apparatus 1, 101 of the embodiment can play a practically beneficial role in determining mechanical properties such as load-bearing capacity by conducting destructive tests on large structures that cannot be housed in a general compression testing apparatus.

[0077] As described above, the strength testing apparatus 1 of the embodiment is an apparatus for performing a strength test by applying pressure to a test specimen 5 between the base 3 and the slide block 4 of the stamping machine 2. The strength testing apparatus 1 includes: a mounting fixture 6 for mounting the test specimen 5 on the base 3; and a flat plate fixture 7 mounted on the slide block 4, having an abutment surface 7a for the test specimen 5 to abut against the opposite side of the mounting fixture 6. Furthermore, the strength testing apparatus 1 includes: a load measuring unit 10 clamped between the slide block 4 and the flat plate fixture 7 for measuring the compressive load P applied to the test specimen 5; and a displacement measuring unit 20 for measuring the position of the slide block 4. Moreover, the strength testing apparatus 1 includes a data accumulation unit 8 that outputs the compressive load P measured by the load measuring unit 10 in association with the position of the slide block 4 measured by the displacement measuring unit 20.

[0078] The strength testing apparatus 1, 101 configured in this way can investigate the strength corresponding to the crushing position of the test specimen 5.

[0079] In detail, the test specimen 5 is placed on the base 3 in a stable state using the mounting fixture 6.

[0080] When the test specimen 5 is compressed by the compressive load P between the base 3 and the slider 4, the stress of the test specimen 5 is transmitted equally through the plate clamp 7 and measured by the load measuring unit 10 as the load F.

[0081] Furthermore, the sliding position of the slider 4 is measured in the displacement measuring unit 20. Then, in the data accumulation unit 8, the load F measured by the load measuring unit 10 is output in relation to the position of the slider 4 measured by the displacement measuring unit 20. Thus, the strength corresponding to the crushing position of the test specimen 5 can be investigated.

[0082] Furthermore, the load measuring unit 10 has multiple load sensors 11 disposed between the slider 4 and the flat plate clamp 7.

[0083] Multiple load sensors 11 enable the load F transmitted via the flat plate clamp 7 to be evenly distributed and measured.

[0084] Therefore, in the data accumulation unit 8, by collecting the load F measured by each load sensor 11, the mechanical properties such as the strength of the test specimen 5 can be measured more accurately.

[0085] In addition, the load sensor 11 is configured in a ring shape.

[0086] Therefore, the load F transferred from the test specimen 5 to the flat plate fixture 7 is measured without deviation by the load sensor 11 configured in a ring shape. Thus, the stress of the test specimen can be determined more accurately.

[0087] Furthermore, the displacement measuring unit 20 is a laser displacement meter 21 that measures the sliding position S of the slider 4 by irradiating the slider 4 with a laser.

[0088] Therefore, the laser displacement gauge 21 can measure the sliding position S of the slider 4 without contacting it. Therefore, it does not affect the load F measured by the load measuring unit 10. Therefore, the strength testing device 1 can more accurately measure the stress corresponding to the crushing position of the test specimen 5.

[0089] Moreover, such as Figure 1 As shown, the laser displacement gauge 21 of this embodiment can measure the vertical sliding position S from above the slider 4. Therefore, even if part of the test sample 5 is scattered due to crushing, it will be blocked by the slider 4 and will not reach the laser displacement gauge 21. Thus, it can achieve the practically beneficial effect of preventing damage to the laser displacement gauge 21.

[0090] This invention is not limited to the embodiments described above, and various modifications are possible. The embodiments described above are illustrative for ease of understanding and are not necessarily limited to all the structures described. Furthermore, a portion of the structure of one embodiment can be replaced with the structure of another embodiment, and the structure of another embodiment can be added to the structure of one embodiment. Additionally, a portion of the structure of each embodiment can be deleted, or other structures can be added or replaced. Possible modifications relative to the above embodiments are as follows.

[0091] In embodiment 1.2, in order to investigate the strength corresponding to the displacement along the direction of load input for test specimens 5 and 25 of different shapes, a stamping machine 2 with a constant load speed in the sliding direction was used, but it is not particularly limited to this.

[0092] For example, the sliding speed can be varied at a low speed in the early stage of the sliding movement. That is, as long as the test piece 5 is of a certain size and enters between the base 3 and the slide block 4 of the stamping machine 2, destructive tests can be performed on various test pieces to determine mechanical properties such as load-bearing capacity. Therefore, there are no particular limitations on the sliding speed and output of the stamping machine 2.

[0093] Furthermore, there are no particular limitations on the number of load sensors 11 used in the load measuring unit 10 or the ring arrangement pattern. For example, three load sensors 11 can be arranged at each vertex of an equilateral triangle, or more than five load sensors 11 can be arranged in a pattern with certain intervals.

[0094] Furthermore, any type of sensor can be used as long as it is clamped between the slider 4 and the flat plate clamp 7 and measures the compressive load applied to the test specimen 5. That is, there are no particular limitations on the number, type, and configuration of the load sensors 11 used in the load measuring unit 10, etc.

[0095] Explanation of reference numerals in the attached figures

[0096] 1 Strength testing apparatus

[0097] 2. Stamping machine

[0098] 3. Base

[0099] 4 sliders

[0100] 5 test samples

[0101] 6. Mounting fixture

[0102] 7. Flatbed clamp

[0103] 7a Contact surface

[0104] 8. Data Accumulation Department

[0105] 10 Load Measurement Unit

[0106] 20 Displacement Measurement Department

Claims

1. A strength testing apparatus, wherein pressure is applied to a test specimen between the base and the slide of a stamping machine to perform a strength test, characterized in that, The strength testing device includes: A mounting fixture is used to mount the test specimen on the base; A flat plate clamp, mounted on the slider, has an abutment surface for the test specimen to abut against the opposite side of the mounting clamp; The load measuring unit is clamped between the slider and the plate clamp to measure the compressive load applied to the test specimen; The displacement measuring unit measures the position of the slider; as well as The data accumulation unit outputs the compressive load measured by the load measuring unit in association with the position of the slider measured by the displacement measuring unit.

2. The strength testing apparatus according to claim 1, characterized in that, The load measuring unit has multiple load sensors disposed between the slider and the flat plate clamp.

3. The strength testing apparatus according to claim 2, characterized in that, The load sensor is configured in a ring shape.

4. The strength testing apparatus according to claim 1, characterized in that, The displacement measuring unit is a laser displacement meter that measures the position of the slider by irradiating the slider with a laser.

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