High-temperature tensile creep testing device for ceramic matrix composite material

Abstract

The invention relates to the technical field of material tensile test detection, and discloses a ceramic matrix composite material high-temperature tensile creep test device, which comprises a tensile testing machine, a liftable lifting plate is arranged on the tensile testing machine, a first clamp is mounted on the tensile testing machine, and the first clamp is mounted on the tensile testing machine through a vertical rod; a first clamp is mounted on the lifting plate, a second clamp is mounted on the lifting plate through a vertical rod, the first clamp is arranged right opposite to the second clamp, a fixing plate is fixed on the tensile testing machine body, and the fixing plate is arranged in the height direction of the tensile testing machine. According to the invention, through a closed cover body structure formed by splicing the double moving covers, the ceramic matrix composite material in the testing process is completely wrapped, so that high-speed chippings generated when the material is broken are effectively prevented from splashing, and mechanical injury and high-temperature scalding risks to operators are avoided.

Description

Technical Field

[0001] This invention relates to the field of material tensile testing technology, and in particular to a high-temperature tensile creep testing device for ceramic matrix composites. Background Technology

[0002] The high-temperature tensile creep testing device for ceramic matrix composites is a device used to evaluate the long-term deformation behavior and mechanical properties of materials under high temperature and constant tensile stress. It is used to measure key parameters such as creep strain, steady-state creep rate, and fracture life of the specimen at high temperature.

[0003] When performing tensile tests on ceramic matrix composites, the fractured material will produce flying debris, which can cause several problems. For example, it poses a direct risk of personal injury to test personnel, as the flying debris may cut the skin, hit the eyes, or other critical areas, leading to serious safety accidents. Test equipment can also be damaged by the impact of the debris. Precise loading systems, deformation measurement devices, and other components may be scratched or collided with by the debris, resulting in decreased equipment accuracy or even malfunction, affecting the accuracy and reliability of subsequent tests, increasing equipment maintenance costs and downtime, and contaminating the test environment with debris. The debris may remain inside or around the test equipment, making cleaning difficult and potentially interfering with subsequent tests.

[0004] Therefore, it is necessary to design a high-temperature tensile creep testing device for ceramic matrix composites to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature tensile creep testing device for ceramic matrix composite materials.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature tensile creep testing device for ceramic matrix composites includes a tensile testing machine. The tensile testing machine is equipped with a liftable lifting plate. A first clamp is installed on the tensile testing machine and is mounted on the tensile testing machine via a vertical rod. A second clamp is installed on the lifting plate and is mounted on the lifting plate via a vertical rod. The first clamp is positioned opposite the second clamp. A fixing plate is fixed to the body of the tensile testing machine and is positioned along the height direction of the tensile testing machine. A vertical plate is fixed on the tensile testing machine, and a protective assembly is provided on the tensile testing machine. The protective assembly consists of two protective structures, each of which includes a movable cover. Each movable cover is equipped with a cleaning component and a shielding component. A driving component is provided on the vertical plate for driving the two movable covers to move, and a pushing component is provided on the vertical plate.

[0007] As a preferred embodiment of the present invention, in the protective structure, the top of the movable cover has a first opening, the bottom has a second opening, the side of the movable cover has a discharge port, the side of the movable cover is fitted with a swingable cover plate, and the cover plate is positioned directly opposite the discharge port. The bottom of the movable cover is fitted with a collection box, and the collection box is positioned directly opposite the discharge port. The protective structure also includes a side plate, the side plate is fixed on a tensile testing machine, and the side of the side plate is fixed with two outer cylinders. An inner rod is slidably arranged in each of the two outer cylinders, and both inner rods are fixedly connected to the movable cover.

[0008] As a preferred embodiment of the present invention, the inner surface of the outer cylinder is fitted with the outer surface of the inner rod.

[0009] As a preferred embodiment of the present invention, the cleaning assembly includes a movable plate, the bottom end of which is provided with bristles that contact the inner bottom surface of the movable cover, the top end of which is fixed with a guide block, the inside of which is fixed with a guide rod, the guide block being slidably sleeved on the guide rod, the guide block being connected to the movable cover by a first spring, and the side of which is fixed with a top rod that is positioned opposite the cover plate.

[0010] As a preferred embodiment of the present invention, the shielding assembly includes a movable baffle and a fixed plate. The fixed plate is fixed to the inner bottom surface of the movable cover. The bottom surface of the movable baffle is provided with a groove, and the fixed plate slides in the groove. The movable baffle is positioned opposite the second opening, and the movable baffle and the fixed plate are connected by a second spring.

[0011] As a preferred embodiment of the present invention, both ends of the movable baffle are provided with inclined surfaces.

[0012] As a preferred embodiment of the present invention, the driving assembly includes a first rotating shaft, a second rotating shaft, and a first rack. The first rotating shaft and the second rotating shaft are rotatably mounted on the side of the vertical plate. The first rotating shaft and the second rotating shaft are connected by a transmission component. Gears are fixedly sleeved on both the first rotating shaft and the second rotating shaft. The first rack is fixed to the side of the lifting plate by a connecting plate. The first rack meshes with the gear on the second rotating shaft. The driving assembly also includes two second racks. The two second racks are respectively fixed to the sides of two movable covers by connecting blocks. Both second racks mesh with the gear on the first rotating shaft.

[0013] As a preferred embodiment of the present invention, the pushing assembly includes two mounting plates and two push rods. Each mounting plate is provided with an inclined surface. Both mounting plates are connected to the vertical plate through mounting rods. The two push rods are slidably inserted into the two movable covers, and the two push rods are respectively positioned facing the inclined surfaces of the two mounting plates.

[0014] As a preferred embodiment of the present invention, when the two movable covers are aligned, the two first openings together form a circular opening, and the two second openings together form a circular opening.

[0015] As a preferred embodiment of the present invention, the width of the movable plate is adapted to the width of the movable cover.

[0016] The present invention has the following beneficial effects: 1. The closed enclosure structure formed by splicing two movable covers completely encloses the ceramic matrix composite material during the test, effectively blocking the high-speed debris from splashing when the material breaks, avoiding the risk of mechanical injury and high-temperature burns to the operators. At the same time, the closed environment reduces the contamination and damage of debris to the test equipment, reduces the equipment failure rate, and extends the service life. In addition, the anti-splash design ensures that the test area is clean, preventing debris from interfering with subsequent experiments or mixing with other materials, thus improving the reliability and repeatability of the test results. 2. By utilizing the mechanical linkage during the opening and closing of the movable cover, the cleaning timing is precisely controlled to ensure that debris is only discharged after the test is completed, thus avoiding interference with the testing process. The debris is collected centrally for unified disposal. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-temperature tensile creep testing device for ceramic matrix composites proposed in this invention; Figure 2 Schematic diagram of the structure when the two movable covers are separated. Figure 1 ; Figure 3 Schematic diagram of the structure when the two movable covers are separated. Figure 2 ; Figure 4 Schematic diagram of the structure when the two movable covers are separated. Figure 3 ; Figure 5 for Figure 4 Enlarged view of the structure at point A; Figure 6 This is a schematic diagram of the movable cover. Figure 7 This is a cross-sectional view of the movable cover. Figure 8 for Figure 7 Enlarged view of the structure at point B; Figure 9 This is a schematic cross-sectional view of the outer cylinder. Figure 10 This describes the structure of the driving component.

[0018] In the diagram: 11. Tensile testing machine; 12. First clamp; 13. Lifting plate; 14. Second clamp; 15. Fixed plate; 21. Moving cover; 22. First opening; 23. Second opening; 24. Waste discharge port; 25. Cover plate; 26. Collection box; 27. Side plate; 28. Outer cylinder; 29. ​​Inner rod; 31. Moving plate; 32. Brush bristles; 33. Guide block; 34. Guide rod; 35. First spring; 36. Top rod; 41. Movable baffle; 42. Settling tank; 43. Fixed plate; 44. Second spring; 51. First rotating shaft; 52. Second rotating shaft; 53. Transmission component; 54. First rack; 55. Connecting plate; 56. Gear; 57. Second rack; 58. Connecting block; 61. Mounting plate; 62. Mounting rod; 63. Push rod. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: This example describes the high-temperature tensile creep testing device for ceramic matrix composites disclosed in this embodiment, referring to... Figure 1-10 The system includes a tensile testing machine 11, which is equipped with a liftable lifting plate 13. A first clamp 12 is installed on the tensile testing machine 11 and is mounted on the tensile testing machine 11 via a vertical rod. A second clamp 14 is installed on the lifting plate 13 and is mounted on the lifting plate 13 via a vertical rod. The first clamp 12 is positioned directly opposite the second clamp 14. During testing, the ceramic matrix composite material is clamped on the first clamp 12 and the second clamp 14. The lifting plate 13 moves the second clamp 14 upward to perform a tensile creep test on the material. The specific structure and working principle of the first clamp 12 and the second clamp 14 are existing technologies, and the implementation method adopts conventional means. They are not shown in the figure and will not be described in detail here. A fixing plate 15 is fixed on the body of the tensile testing machine 11 and is positioned along the height direction of the tensile testing machine 11.

[0021] A vertical plate is fixed on the tensile testing machine 11. A protective assembly is installed on the tensile testing machine 11, consisting of two protective structures. Each protective structure includes a movable cover 21 and a side plate 27. The movable cover 21 has a first opening 22 at its top and a second opening 23 at its bottom. When the two movable covers 21 are joined together, the two first openings 22 and the two second openings 23 together form a circular opening. A waste discharge port 24 is provided on the side of the movable cover 21. A swingable cover plate 25 is installed on the side of the movable cover 21, and the cover plate 25 is positioned directly opposite the waste discharge port 24. Initially, the cover plate 25 is closed over the waste discharge port 24. A collection box is provided at the bottom of the movable cover 21. 26, and the collection box 26 is set directly opposite the discharge port 24. The side plate 27 is fixed on the tensile testing machine 11. Two outer cylinders 28 are fixed on the side of the side plate 27. An inner rod 29 is slidably arranged in each of the two outer cylinders 28. The two inner rods 29 are fixedly connected to the movable cover 21. During the movement of the movable cover 21, it can drive the two inner rods 29 to move. During this process, the two inner rods 29 and the two outer cylinders 28 together provide a limit for the movable cover 21, ensuring the stability of the movable cover 21 during the movement. When the two movable covers 21 are spliced ​​together, the two movable covers 21 together form a complete cover structure. At this time, the first clamp 12 and the second clamp 14 are both located inside the cover structure.

[0022] Each movable cover 21 is equipped with a cleaning assembly, which includes a movable plate 31. The bottom end of the movable plate 31 has bristles 32 that contact the inner bottom surface of the movable cover 21. A guide block 33 is fixed to the top end of the movable plate 31, and a guide rod 34 is fixed inside the movable cover 21. The guide block 33 is slidably mounted on the guide rod 34. The guide block 33 and the guide rod 34 together limit the movement of the movable plate 31, ensuring that the movable plate 31 can only move linearly. The guide block 33 is connected to the movable cover 21 by a first spring 35, which is used for the automatic reset of the movable plate 31. A top rod 36 is fixed to the side of the movable plate 31. 36 is positioned opposite the cover plate 25. The interior of the movable cover 21 is equipped with a shielding component, which includes a movable baffle 41 and a fixed piece 43. The fixed piece 43 is fixed to the inner bottom surface of the movable cover 21. The bottom surface of the movable baffle 41 has a recess 42, and the fixed piece 43 slides in the recess 42. The recess 42 allows the movable baffle 41 to move relative to the fixed piece 43. The movable baffle 41 is positioned opposite the second opening 23. Both ends of the movable baffle 41 are provided with inclined surfaces. The movable baffle 41 and the fixed piece 43 are connected by a second spring 44. Under the elastic force of the second spring 44, in the initial state, the movable baffle 41 is positioned opposite the second opening 23.

[0023] In the initial state, the two movable covers 21 are separated from each other, making it convenient for staff to clamp the test material onto the first clamp 12 and the second clamp 14. After the material is clamped, the two movable covers 21 come together and are finally aligned. When the two movable covers 21 are aligned, the two first openings 22 together form a circular opening, and the two second openings 23 together form a circular opening. The two vertical rods connected to the first clamp 12 and the second clamp 14 are located in the two circular openings respectively. For the two first openings 22, the vertical rods connected to the first clamp 12 will squeeze the two movable baffles 41, causing the two movable baffles 41 to move away from each other. During the test, the test material is located inside the two movable covers 21. When the test material is broken, the fragments from the broken material will scatter inside the two movable covers 21. This design can prevent the fragments from flying off.

[0024] Example 2: Based on Example 1, this example presents a high-temperature tensile creep testing device for ceramic matrix composite materials, referring to... Figure 1-10 A drive assembly is provided on the vertical plate to drive the two movable covers 21 to move. The drive assembly includes a first rotating shaft 51, a second rotating shaft 52 and a first rack 54. The first rotating shaft 51 and the second rotating shaft 52 are rotatably mounted on the side of the vertical plate. The first rotating shaft 51 and the second rotating shaft 52 are connected by a transmission component 53. Gears 56 are fixedly sleeved on the first rotating shaft 51 and the second rotating shaft 52. The first rack 54 is fixed to the side of the lifting plate 13 by a connecting plate 55. The first rack 54 meshes with the gear 56 on the second rotating shaft 52. The drive assembly also includes two second racks 57. The two second racks 57 are fixed to the side of the two movable covers 21 by connecting blocks 58. The two second racks 57 mesh with the gear 56 on the first rotating shaft 51. During testing, the two movable covers 21 are closed, and then the lifting plate 13 moves upward. When the lifting plate 13 moves upward, it drives the second clamp 14 to move upward, so that the second clamp 14 continuously applies tension to the material. At the same time, the lifting plate 13 drives the first rack 54 to move through the connecting plate 55. When the first rack 54 moves, it drives the corresponding gear 56 to rotate, so that the gear 56 drives the second rotating shaft 52 to rotate. When the second rotating shaft 52 rotates, it drives the first rotating shaft 51 to rotate through the transmission component 53. When the first rotating shaft 51 rotates, the gear 56 on it rotates accordingly. When the gear 56 on the first rotating shaft 51 rotates, it can drive the two second racks 57 to move synchronously and move closer to each other, so that the two movable covers 21 move closer to each other.

[0025] A pushing assembly is provided on the vertical plate, comprising two mounting plates 61 and two push rods 63. Each mounting plate 61 has an inclined surface. Both mounting plates 61 are connected to the vertical plate via mounting rods 62. The two push rods 63 slide through the two movable covers 21, with each push rod 63 facing the inclined surface of the two mounting plates 61. Initially, both movable plates 61 are located at one end of their respective movable covers 21. When the two movable covers 21 approach each other, the two push rods 63 gradually separate from the two mounting plates 61. During this process, the mounting plates 61 no longer restrict the position of the push rods 63, and the movable plates 61 move towards the other end of the movable cover 21 under the action of the first spring 35. Conversely, after the test, the two movable covers 21 move away from each other. During this process, the push rods 63 contact the inclined surface of the mounting plate 61 and move along the inclined surface of the mounting plate 61. When push rod 63 moves, it drives moving plate 31 to move. During the movement of moving plate 31, the bristles 32 on its bottom surface can push the debris inside the bottom surface of moving cover 21 and push the debris towards the discharge port 24. When moving plate 31 moves to a position close to cover plate 25, push rod 36 on the side of moving plate 31 will push cover plate 25, causing cover plate 25 to rotate, thereby opening discharge port 24. Then, bristles 32 can push the debris out through discharge port 24, so that the debris falls into collection box 26, realizing automatic collection of debris. It is worth noting that during the movement of moving plate 31, the two moving covers 21 will not complete the alignment action. Only when moving plate 31 moves to the end position of moving cover 21 will the two moving covers 21 be completely aligned. This design can avoid the situation where moving plate 31 comes into contact with test material during the movement, ensuring the smooth movement of moving plate 31.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature tensile creep testing device for ceramic matrix composites, characterized in that, The tensile testing machine (11) is provided with a liftable lifting plate (13). A first clamp (12) is installed on the tensile testing machine (11) and the first clamp (12) is installed on the tensile testing machine (11) by means of a vertical rod. A second clamp (14) is installed on the lifting plate (13) and the second clamp (14) is installed on the lifting plate (13) by means of a vertical rod. The first clamp (12) is positioned opposite the second clamp (14). A fixing plate (15) is fixed on the body of the tensile testing machine (11) and the fixing plate (15) is positioned along the height direction of the tensile testing machine (11). A vertical plate is fixed on the tensile testing machine (11), and a protective component is provided on the tensile testing machine (11). The protective component consists of two protective structures, each of which includes a movable cover (21). Each movable cover (21) is provided with a cleaning component and a shielding component inside. A driving component is provided on the vertical plate to drive the two movable covers (21) to move. A pushing component is provided on the vertical plate.

2. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 1, characterized in that, In the protective structure, the top of the movable cover (21) is provided with a first opening (22) and the bottom is provided with a second opening (23). The side of the movable cover (21) is provided with a discharge port (24). The side of the movable cover (21) is provided with a swingable cover plate (25), and the cover plate (25) is positioned opposite the discharge port (24). The bottom of the movable cover (21) is provided with a collection box (26), and the collection box (26) is positioned opposite the discharge port (24). The protective structure also includes a side plate (27). The side plate (27) is fixed on the tensile testing machine (11). The side of the side plate (27) is fixed with two outer cylinders (28). The two outer cylinders (28) are each slidably provided with an inner rod (29). The two inner rods (29) are fixedly connected to the movable cover (21).

3. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 2, characterized in that, The inner surface of the outer cylinder (28) is in contact with the outer surface of the inner rod (29).

4. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 1, characterized in that, The cleaning assembly includes a movable plate (31), the bottom end of which is provided with bristles (32), and the bristles (32) are in contact with the inner bottom surface of the movable cover (21). A guide block (33) is fixed at the top end of the movable plate (31), and a guide rod (34) is fixed inside the movable cover (21). The guide block (33) is slidably sleeved on the guide rod (34). The guide block (33) and the movable cover (21) are connected by a first spring (35). A top rod (36) is fixed on the side of the movable plate (31), and the top rod (36) is positioned opposite the cover plate (25).

5. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 4, characterized in that, The shielding assembly includes a movable baffle (41) and a fixed piece (43). The fixed piece (43) is fixed to the inner bottom surface of the movable cover (21). The bottom surface of the movable baffle (41) is provided with a groove (42), and the fixed piece (43) slides in the groove (42). The movable baffle (41) is positioned opposite the second opening (23). The movable baffle (41) and the fixed piece (43) are connected by a second spring (44).

6. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 5, characterized in that, Both ends of the movable baffle (41) are provided with inclined surfaces.

7. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 1, characterized in that, The drive assembly includes a first rotating shaft (51), a second rotating shaft (52), and a first rack (54). The first rotating shaft (51) and the second rotating shaft (52) are rotatably mounted on the side of the vertical plate. The first rotating shaft (51) and the second rotating shaft (52) are connected by a transmission component (53). Gears (56) are fixedly sleeved on both the first rotating shaft (51) and the second rotating shaft (52). The first rack (54) is fixed to the side of the lifting plate (13) by a connecting plate (55). The first rack (54) meshes with the gear (56) on the second rotating shaft (52). The drive assembly also includes two second racks (57). The two second racks (57) are fixed to the side of the two movable covers (21) by connecting blocks (58). The two second racks (57) mesh with the gear (56) on the first rotating shaft (51).

8. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 7, characterized in that, The pushing assembly includes two mounting plates (61) and two push rods (63). Each mounting plate (61) is provided with an inclined surface. Both mounting plates (61) are connected to the vertical plate through mounting rods (62). The two push rods (63) are slidably inserted on the two movable covers (21) respectively, and the two push rods (63) are respectively set facing the inclined surfaces of the two mounting plates (61).

9. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 2, characterized in that, When the two movable covers (21) are aligned, the two first openings (22) together form a circular opening, and the two second openings (23) together form a circular opening.

10. The high-temperature tensile creep testing device for ceramic matrix composites according to claim 4, characterized in that, The width of the movable plate (31) is adapted to the width of the movable cover (21).

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