Compression testing device for metal matrix composites under ultra-high temperature environment

Abstract

The utility model discloses a compression performance testing device of metal matrix composite material under ultrahigh temperature environment, it includes base and the L type cantilever for being established above the base, is equipped with the downward pressure bar below the cantilever top, and the pressure bar corresponds to the top of base, and the mounting seat of installing the sample is equipped between the pressure bar and base, is equipped with the heating portion of laterally extending to the mounting seat place on the cantilever, heating portion include induction coil, and the sample on the mounting seat is set around induction coil, it is the compression form of using the end of sample to carry out the compression performance test of force, sets up high temperature resistant ceramic sand to the end of sample, and high temperature resistant ceramic sand is the force transmission part, and the compression force is transmitted to the sample, can avoid local stress concentration, and the precision of compression performance test is promoted.

Description

Technical Field

[0001] This utility model relates to a performance testing device for composite materials, specifically a device for testing the compressive properties of metal matrix composite materials under ultra-high temperature conditions. Background Technology

[0002] Compression performance testing is a test method that measures the mechanical properties of materials by applying axial static pressure. It is mainly used to evaluate parameters such as compressive strength and elastic modulus. For specific materials, it is also necessary to measure the material's performance in a specific environment. For example, materials used in high-temperature environments need to have their performance tested in a high-temperature environment.

[0003] Materials applied to the field of ultra-high temperature technology also require performance testing in an ultra-high temperature environment. Currently, the performance testing method generally involves clamping the material sample and then compressing it using a hydraulic rod to test its performance. However, due to the ultra-high temperature environment, conventional clamps are prone to failure and loosening under such conditions, affecting the actual test results. Even if the heating component does not directly heat the clamp, this problem still exists in actual operation. Ideally, the compression performance test should be performed at the end of the sample. However, in actual operation, it is difficult to ensure that the fracture surface of the sample is absolutely straight. In this case, applying pressure to the end of the test can easily cause local stress concentration on the end face, causing damage to the sample and thus affecting the final test results. Summary of the Invention

[0004] This invention relates to a device for testing the compressive properties of metal matrix composites under ultra-high temperature conditions. It uses a compression method that applies force to the end of the sample for performance testing. High-temperature resistant ceramic sand is placed at the end of the sample and used as a force transmission part to transfer the compressive force to the sample, which can avoid local stress concentration and improve the accuracy of the compressive performance test.

[0005] A device for testing the compressive properties of metal matrix composites under ultra-high temperature conditions includes a base and an L-shaped cantilever mounted on the base. A downward pressure rod is provided below the top of the cantilever, corresponding to the top of the base. A mounting seat for mounting the sample is provided between the pressure rod and the base. A heating part is provided on the cantilever that extends laterally to the mounting seat. The heating part includes an induction coil, which is arranged to surround the sample on the mounting seat.

[0006] The heating element also includes a high-strength graphite sleeve, which is connected to the side of the cantilever via a bracket. The induction coil is wrapped around the outside of the high-strength graphite sleeve. The mounting base corresponds to the high-strength graphite sleeve, and when the sample is installed in the mounting base, the sample corresponds to the center of the high-strength graphite sleeve.

[0007] Furthermore, upright plates are provided on both sides of the cantilever and the base, and a movable sealing plate is provided at the front of the cantilever and the base. When the sealing plate is closed, the area between the cantilever forms a closed space, and a vacuum pipe connected to the interior is provided on the upright plate.

[0008] The mounting base includes two slots arranged opposite each other, with slots corresponding to the sample. The bottom of the lower slot is a closed structure, while the slot in the upper slot is a through structure. A corresponding insert rod is movably inserted into the upper slot. When the sample is installed in the slot, its top and bottom are filled with high-temperature resistant ceramic sand. The insert rod is inserted into the corresponding slot in the upper slot and compressed downwards by a pressure rod.

[0009] The mounting base also includes a bracket for mounting the two slots, which are respectively located at the top and bottom of the bracket, and the high-strength graphite sleeve of the heating part corresponds to the two slots.

[0010] The bracket is triangular in shape, with a triangular support at the bottom. The support has arc-shaped sliding surfaces at the front and back, and a slot at the top center of the support. Above the base is an intermediate seat corresponding to the mounting seat. The top surface of the intermediate seat has a recessed arc-shaped groove, and the sliding surface at the bottom of the support slides within the arc-shaped groove.

[0011] Furthermore, the top of the insertion rod is provided with an arc-shaped protrusion, and vertical retaining plates are provided on the front and rear sides of the protrusion respectively. The retaining plates correspond to the front and rear parts of the upper retaining groove. When the insertion rod slides up and down in the groove, the upper retaining groove slides between the retaining plates.

[0012] Furthermore, the bottom of the pressure rod is provided with a pressure head, and the bottom of the pressure head is provided with an arc-shaped groove corresponding to the protrusion at the top of the insertion rod. The diameter of the arc-shaped groove on the pressure head is smaller than the diameter of the arc-shaped groove on the intermediate seat. When the pressure rod moves the pressure head downward, the arc surface on the protrusion corresponds to the arc-shaped groove at the bottom of the pressure head.

[0013] The present invention, by adopting the above-described technical solution, has the following beneficial effects: This device uses high-temperature resistant ceramic sand as the receiving part to perform compression tests on the sample, avoiding the problem of local stress concentration that may be caused by directly applying force to the end face of the sample. The arc-shaped groove at the bottom of the indenter and the arc-shaped groove structure on the middle seat can better guide the direction of the sample during the actual compression test, preventing the problem of inaccurate test caused by sample position deviation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the mounting bracket.

[0016] Figure 3 This is a sectional view of the base and cantilever.

[0017] Figure 4 This is a cross-sectional view of the sample after it has been mounted on the mounting base. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following embodiments are only one or more manifestations of the present invention and are not a complete limitation on the invention content recorded in this application. Any improvements made based on the invention content or technical solution recorded in this application that are known to those skilled in the art should fall within the scope of protection claimed in this application.

[0019] Furthermore, the descriptions of directions such as up, down, left, right, front, and back presented in the specific embodiments are merely for the purpose of describing the technical solutions and are not absolute limitations unless otherwise stated.

[0020] like Figures 1-4 The device shown is for testing the compression performance of metal matrix composites under ultra-high temperature conditions. It includes a base 1 and an L-shaped cantilever 2 above the base 1. A downward pressure rod 3 is provided below the top of the cantilever 2, and the pressure rod 3 corresponds to the top of the base 1. A mounting seat 4 for mounting the sample 0 is provided between the pressure rod 3 and the base 1. A heating part 5 is provided on the cantilever 2, extending laterally to the mounting seat 4. The heating part 5 includes an induction coil 501, which is arranged to surround the sample 0 on the mounting seat 4.

[0021] The heating part 5 also includes a high-strength graphite sleeve 502, which is connected to the side of the cantilever 2 via a bracket 503. The induction coil 501 is wrapped around the outside of the high-strength graphite sleeve 502. The mounting base 4 corresponds to the high-strength graphite sleeve 502. When the sample 0 is installed in the mounting base 4, the sample 0 corresponds to the center of the high-strength graphite sleeve 502.

[0022] Furthermore, the cantilever 2 and the base 1 are respectively provided with upright plates 601 on both sides, and the front of the cantilever 2 and the base 1 is also provided with a movable sealing plate 602. When the sealing plate 602 is closed, the area between the cantilever 2 forms a closed space, and the upright plate 601 is provided with a vacuum pipe 603 that connects to the interior.

[0023] The mounting base 4 includes two slots 401 arranged opposite each other, and the slots 401 are provided with slots 402 corresponding to the sample 0. The bottom of the lower slot 401 is a closed structure, and the slots 402 in the upper slot 401 are a through structure. A rod 403 corresponding to the slot 402 is movably inserted into the upper slot 401. When the sample 0 is installed in the slot 402 on the slot 401, its top and bottom are filled with high-temperature resistant ceramic sand 404. The rod 403 is inserted into the slot 402 corresponding to the upper slot 401 and compressed downward by the pressure rod 403.

[0024] The mounting base 4 also includes a bracket 405 for mounting the two slots 401. The slots 401 are respectively located at the top and bottom of the bracket 405, and the high-strength graphite sleeve 502 of the heating part 5 corresponds to the two slots 401.

[0025] The bracket 405 is triangular in shape. The bottom of the bracket 405 is provided with a triangular support part 406. The bottom of the support part 406 is provided with arc-shaped sliding surfaces 407 at the front and back respectively. The slot 401 below is provided at the top center of the support part 406. The base 1 is provided with an intermediate seat 101 corresponding to the mounting seat. The top surface of the intermediate seat 101 is provided with a recessed first arc-shaped groove 102. The sliding surface 407 at the bottom of the support part 406 slides in the first arc-shaped groove 102.

[0026] Furthermore, the top of the insertion rod 403 is provided with an arc-shaped protrusion 408, and vertical retaining plates 409 are provided on the front and rear sides of the protrusion 408 respectively. The retaining plates 409 correspond to the front and rear parts of the upper retaining groove 401. When the insertion rod 403 slides up and down in the slot 402, the upper retaining groove 401 slides between the retaining plates 409.

[0027] Furthermore, the bottom of the pressure rod 3 is provided with a pressure head 301, and the bottom of the pressure head 301 is provided with a second arc-shaped groove 302 corresponding to the protrusion 408 on the top of the insertion rod 403. The diameter of the second arc-shaped groove 302 on the pressure head 301 is smaller than the diameter of the first arc-shaped groove 102 on the intermediate seat 101. When the pressure rod 3 moves the pressure head 301 downward, the arc surface on the protrusion 408 corresponds to the second arc-shaped groove 302 at the bottom of the pressure head 301.

[0028] When using this device, first install the intermediate seat on the base, then install the mounting seat in the first arc-shaped groove on the intermediate seat, inject high-temperature resistant ceramic sand into the slot on the lower slot, then insert the sample into the slot on the upper slot, and inject high-temperature resistant ceramic sand into the slot on the upper slot, then insert the insertion rod into the top slot. At this time, the top and bottom of the sample are in contact with the high-temperature resistant ceramic sand, and then the pressure rod drives the pressure head to apply force downward to the protrusion on the top of the insertion rod.

[0029] During compression, the sliding surfaces at the front and rear of the bottom of the support slide within the first arc-shaped groove, and the top protrusion slides within the second arc-shaped groove. When used together, the mounting base can maintain a stable vertical position under the vertical support of the pressure rod. Combined with the high-temperature resistant ceramic sand set in the slot on the card slot, the sample is stabilized in a reasonable test position on the one hand, and can accept stable compression force on the other hand, thereby achieving the best test results.

Claims

1. A device for testing the compressive properties of metal matrix composites under ultra-high temperature conditions, characterized in that: It includes a base and an L-shaped cantilever mounted on the base. A downward pressure bar is provided below the top of the cantilever, corresponding to the top of the base. A mounting seat for mounting the sample is provided between the pressure bar and the base. A heating part is provided on the cantilever that extends laterally to the mounting seat. The heating part includes an induction coil, which is arranged around the sample on the mounting seat.

2. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 1, characterized in that: The heating element also includes a high-strength graphite sleeve, which is connected to the side of the cantilever via a bracket. The induction coil is wrapped around the outside of the high-strength graphite sleeve. The mounting base corresponds to the high-strength graphite sleeve, and when the sample is installed in the mounting base, the sample corresponds to the center of the high-strength graphite sleeve.

3. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 2, characterized in that: The cantilever and the base are respectively provided with upright plates on both sides, and the front of the cantilever and the base is also provided with a movable sealing plate. When the sealing plate is closed, the area between the cantilever forms a closed space. The upright plate is provided with a vacuum pipe that connects to the interior.

4. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 3, characterized in that: The mounting base includes two slots arranged opposite each other, with slots corresponding to the sample. The bottom of the lower slot is a closed structure, while the slot in the upper slot is a through structure. A corresponding insert rod is movably inserted into the upper slot. When the sample is installed in the slot, its top and bottom are filled with high-temperature resistant ceramic sand. The insert rod is inserted into the corresponding slot in the upper slot and compressed downwards by a pressure rod.

5. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 4, characterized in that: The mounting base also includes a bracket for mounting the two slots, which are respectively located at the top and bottom of the bracket, and the high-strength graphite sleeve of the heating part corresponds to the two slots.

6. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 5, characterized in that: The bracket is triangular in shape, with a triangular support at the bottom. The support has arc-shaped sliding surfaces at the front and back, and a slot at the top center of the support. Above the base is an intermediate seat corresponding to the mounting seat. The top surface of the intermediate seat has a recessed arc-shaped groove, and the sliding surface at the bottom of the support slides within the arc-shaped groove.

7. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 6, characterized in that: The top of the insertion rod has an arc-shaped protrusion, and vertical retaining plates are provided on the front and back sides of the protrusion. The retaining plates correspond to the front and back parts of the upper retaining groove. When the insertion rod slides up and down in the groove, the upper retaining groove slides between the retaining plates.

8. The compressive performance testing device for metal matrix composites under ultra-high temperature environment according to claim 7, characterized in that: The pressure rod has a pressure head at its bottom, and the bottom of the pressure head has an arc-shaped groove corresponding to the protrusion at the top of the insertion rod. The diameter of the arc-shaped groove on the pressure head is smaller than the diameter of the arc-shaped groove on the intermediate seat. When the pressure rod moves the pressure head downward, the arc surface on the protrusion corresponds to the arc-shaped groove at the bottom of the pressure head.

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