Anti-slip prefabrication device for test piece high-temperature extensometer

Abstract

The invention provides an anti-slip prefabrication device for a high-temperature extensometer of a test piece, and the device comprises an auxiliary positioning tool which comprises a bottom plate part and a group of guide rails, the guide rails are arranged at the two sides of the bottom plate part and protrude upwards, and an upper groove is defined by the bottom plate part and the guide rails; the test piece is fixedly arranged in the upper groove; the at least one cross beam is connected to the guide rail in a sliding manner and is positioned above the test piece; and the at least one metal rod penetrates through the cross beam, so that the tip of the metal rod is pressed against the upper surface of the test piece. According to the method, a small amount of high-temperature ceramic adhesive is utilized, the strip-shaped protrusions with the middle V-shaped grooves can be rapidly, efficiently and accurately prefabricated at the needed positions of the surface of the ceramic matrix composite material test piece, the strip-shaped protrusions are effectively prevented from slipping, then the accuracy of strain measurement results is ensured, and the success rate of the test is remarkably increased.

Description

Technical Field

[0001] This invention relates to the field of high-temperature deformation testing of ceramic matrix composites, and particularly to an anti-slip prefabrication device for a high-temperature extensometer of test specimens. Background Technology

[0002] In existing technologies, ceramic matrix composites are a type of composite material made by combining ceramics as the matrix with various fibers. They typically possess excellent properties such as high temperature resistance, high strength and modulus, low density, and strong corrosion resistance, and have broad application prospects in aerospace hot-end structural components. As a novel high-temperature structural material, ceramic matrix composites require high-temperature deformation data under load to be measured using a contact high-temperature extensometer at high ambient temperatures. This data serves as crucial performance data to support design and analysis.

[0003] Currently, the contact-type high-temperature extensometers typically consist of two measuring arms, each equipped with a ceramic extension rod. In high-temperature mechanical property testing of materials, the high-temperature extensometer is a measuring device used to measure the deformation (strain) of materials under high-temperature conditions. The tip of the ceramic extension rod contacts the surface of the tested material and is positioned using friction, thus completing the measurement and transmission of the material's deformation under load within the test gauge length.

[0004] However, because the test piece has a relatively flat and smooth surface and is hard and brittle, and the contact area and friction between the cutting edge of the high-temperature ceramic rod and the material surface are small, relative slippage can easily occur during the test, resulting in failure to measure the deformation, which in turn reduces the success rate of the test and increases the test cost.

[0005] Currently, in the process of measuring the high-temperature strain of ceramic matrix composite specimens using contact-type high-temperature extensometers, the ceramic rod of the extensometer is prone to slippage, leading to the failure of high-temperature strain measurements and tests, significantly reducing the success rate of the tests, and increasing the test costs. Here, slippage refers to the behavior of two contacting objects sliding relative to each other under the action of different external mechanical loads, overcoming the frictional force on the contact surface.

[0006] In view of this, the inventors of this application have designed an anti-slip prefabrication device for a high-temperature extensometer of test specimens in order to overcome the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defect that the ceramic rod of the extensometer in the prior art is prone to slippage, which leads to the failure of high temperature strain measurement and testing, and to provide an anti-slip prefabricated device for high temperature extensometers of test pieces.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] An anti-slip prefabrication device for a high-temperature extensometer of a test piece, characterized in that the anti-slip prefabrication device comprises:

[0010] An auxiliary positioning fixture includes a base plate and a set of guide rails. The guide rails are arranged on both sides of the base plate and protrude upwards. An upper groove is formed between the base plate and the guide rails.

[0011] The test piece is fixedly installed in the upper groove;

[0012] At least one crossbeam is slidably connected to the guide rail and located above the test piece;

[0013] At least one metal rod passes through the crossbeam such that the tip of the metal rod presses against the upper surface of the test piece.

[0014] According to one embodiment of the present invention, the base plate portion and the guide rail are integrally formed.

[0015] According to one embodiment of the present invention, the test piece includes a test section, a transition section and a clamping section connected in sequence.

[0016] According to one embodiment of the present invention, a support protrusion is provided on the guide rail located on one side of the base plate portion. The support protrusion extends along the inner side of the guide rail into the upper groove for abutting and limiting against one side of the test section.

[0017] According to one embodiment of the present invention, the auxiliary positioning fixture further includes at least one tightening nut, which passes through the outer side of the guide rail into the upper groove for positioning and fixing with the other side of the test section.

[0018] According to one embodiment of the present invention, at least one recess is provided on the base plate portion, the recess is located on the other side of the base plate portion, and the tightening nut is accommodated in the recess.

[0019] According to one embodiment of the present invention, a through positioning groove is provided on the crossbeam, and positioning sliders are provided on both sides of the crossbeam extending downward. The positioning sliders are installed in corresponding guide rails, and the metal rod passes through the positioning groove.

[0020] According to one embodiment of the present invention, the upper part of the metal rod is a straight rod structure, the end of the metal rod is a pointed part, and a strip-shaped protrusion is provided on the test section of the test piece, and the pointed part is locked in the strip-shaped protrusion.

[0021] According to one embodiment of the present invention, a V-shaped groove is provided on the strip-shaped protrusion, and the tip is engaged in the V-shaped groove.

[0022] According to one embodiment of the present invention, the tip is coated with high-temperature ceramic adhesive.

[0023] The positive and progressive effects of this invention are as follows:

[0024] This invention relates to an anti-slip prefabrication device for high-temperature extensometers of test specimens. With the aid of designed auxiliary tooling and methods, and using a small amount of high-temperature ceramic adhesive, a strip-shaped protrusion with a centrally located V-shaped groove can be prefabricated at the required position on the surface of the ceramic matrix composite test specimen quickly, efficiently, and accurately. This protrusion is used for the insertion and positioning of the blade tip of the ceramic rod of the high-temperature extensometer during subsequent high-temperature testing, effectively preventing slippage and ensuring the accuracy of strain measurement results, thus significantly improving the success rate of the test. Attached Figure Description

[0025] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0026] Figure 1 This is a schematic diagram of the anti-slip prefabrication device for a high-temperature extensometer of a test piece according to the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the test specimen used in the anti-slip prefabrication device of the high-temperature extensometer of the test specimen according to the present invention.

[0028] Figure 3 This is a schematic diagram of the auxiliary positioning fixture in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention. Figure 1 .

[0029] Figure 4 This is a schematic diagram of the auxiliary positioning fixture in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention. Figure 2 .

[0030] Figure 5 This is a schematic diagram showing the installation of the auxiliary positioning fixture and the test piece in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0031] Figure 6 This is a schematic diagram of the crossbeam structure in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0032] Figure 7 This is a front view of the crossbeam in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0033] Figure 8 This is a schematic diagram showing the installation of the auxiliary positioning fixture, the test piece, and the crossbeam assembly in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0034] Figure 9 This is a schematic diagram of the metal rod in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0035] Figure 10 This is a perspective view of the metal rod tip being coated with high-temperature ceramic adhesive in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention.

[0036] Figure 11 for Figure 10 Enlarged view of part A in the middle.

[0037] Figure 12 This is a schematic diagram of the structure of the anti-slip prefabrication device for the high-temperature extensometer of the test piece in this invention, in which strip-shaped protrusions are provided on the test piece.

[0038] Figure 13 This is a schematic diagram of the pre-cured state of the strip-shaped protrusions in the anti-slip prefabrication device for the high-temperature extensometer of the test piece according to the present invention. Detailed Implementation

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0041] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0042] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0043] like Figure 1 As shown, this invention discloses an anti-slip prefabrication device for a high-temperature extensometer of a test piece, comprising: an auxiliary positioning fixture 10, a test piece 20, at least one crossbeam 30, and at least one metal rod 40. The test piece 20 is clamped within the auxiliary positioning fixture 10, and the crossbeam 30 is slidably connected to the auxiliary positioning fixture 10, sliding along the auxiliary positioning fixture 10 and positioned above the test piece 20. The metal rod 40 is inserted into the crossbeam 30, such that its tip, coated with high-temperature ceramic adhesive, contacts the test piece 20.

[0044] like Figure 2As shown, the test piece 20 includes a test section 21, a transition section 22, and a clamping section 23 connected in sequence. In this embodiment, the test section 21, the transition section 22, and the clamping section 23 are configured as a single molded structure, forming different functional areas. The test section 21 forms the test area, the transition section 22 is used to connect the transition test section 21 and the clamping section 23, and the clamping section 23 forms the clamping area.

[0045] like Figure 3 and Figure 4 As shown, the auxiliary positioning fixture 10 includes a base plate 11 and a set of guide rails 12. The guide rails 12 are respectively arranged on both sides of the base plate 11 and protrude upward. The base plate 11 and the guide rails 12 form an upper groove 13.

[0046] The base plate 11 and the guide rail 12 are preferably integrally formed. The guide rail 12 is preferably configured as a side guide rail with an inner guide rail groove, and the lengths of both ends of the guide rail 12 extend outward along the length direction of the base plate 11.

[0047] Preferably, the auxiliary positioning fixture 10 is further provided with at least one support protrusion 14 and at least one tightening nut 15. The support protrusion 14 is disposed on a guide rail 12 on one side of the base plate portion 11, and extends upward into a groove 13 along the inner side of the guide rail 12, for abutting and limiting its position against one side of the test section 21. The tightening nut 15 passes through the groove 13 from the outer side of the guide rail 12 on the other side of the base plate portion 11, and is positioned and fixed against the other side of the test section 21.

[0048] Furthermore, at least one recess 16 is provided on the base plate portion 11. Here, the recess 16 is preferably located on the other side of the base plate portion 11, and the top nut 15 passing through the guide rail 12 is partially accommodated in the recess 16.

[0049] like Figure 5 As shown, the test piece 20 is fixedly installed in the upper groove 13. The direction of the guide rail 12 is parallel to the long axis of the test piece 20. The support protrusion 14 abuts against and limits one side of the test section 21 of the test piece 20. The recessed hole 16 is preferably set as a bolt hole, passing through the bottom of the other guide rail 12 and extending into the bottom surface of the upper groove 13. The recessed hole 16 allows the tightening bolt 15 to be screwed in, and its front end can press against the other side of the test section 21. This structure can achieve relative positioning and fixation of the test piece 20 and the auxiliary positioning fixture 10.

[0050] like Figures 6 to 8As shown, the crossbeam 30 is slidably connected to the guide rail 12 and is located above the test piece 20. The crossbeam 30 is preferably a U-shaped beam structure. A through positioning groove 31 is provided on the crossbeam 30 (e.g., centrally located on the crossbeam 30), and positioning sliders 32 extend downwards on both sides of the crossbeam 30. The positioning sliders 32 are installed in the corresponding guide rails 12 on both sides, for cooperation with the side guide rails 12, and for sliding along the long axis of the test piece 20.

[0051] like Figure 8 As shown, the test section 21 of the test piece 20 is placed in the upper groove 13 area. One side of the test section 21 is contacted and pressed against by the support protrusion 14, and the other side is pressed against by the front end face of the tightening screw 15. In the installed and fixed state, the mid-surface of the test piece 20 in the long axis direction coincides with the mid-surface of the auxiliary positioning fixture 10 in the long axis direction. After the test piece 20 and the auxiliary positioning fixture 10 are installed and fixed, the two sliding crossbeams 30 are installed on the guide rails 12 on both sides in sequence. The position of the two crossbeams 30 in the long axis of the test piece 20 is adjusted so that the center of the positioning groove 31 is aligned with the installation position of the two ceramic rods of the high temperature extensometer, and then the position of the two crossbeams 30 is locked and fixed.

[0052] like Figures 9 to 11 As shown, the upper part of the metal rod 40 is a straight rod structure, and its cross-sectional shape is similar to that of the positioning groove 31. The lower end of the metal rod 40 is provided with a pointed tip 41. The metal rod 40 passes through the positioning groove 31. The test section 21 of the test piece 20 is provided with strip-shaped protrusions 24 (such as...). Figure 12 As shown, this causes the tip 41 to be engaged within the strip-shaped protrusion 24. When the metal rod 40 is inserted into the positioning groove 31, the two are limited by contact surfaces, and the positioning groove 31 can accurately position the metal rod 40.

[0053] Preferably, the strip-shaped protrusion 24 has a V-shaped groove 241, which allows the tip 41 to be engaged in the V-shaped groove 241.

[0054] like Figure 13 As shown, a small amount of high-temperature ceramic adhesive 50 is applied to the tip 41 of the metal rod 40. Then, the two metal rods 40 are passed through the two positioning grooves 31, so that the tips with the high-temperature ceramic adhesive are pressed against the surface of the test piece 20. After curing in this state for a period of time, the two metal rods 40 are removed. That is, two strip-shaped protrusions 24 with a central V-shaped groove 241 are pre-fabricated at the required position on the surface of the test section 21 of the test piece 20 (e.g., Figure 12 (As shown). In subsequent tests, the front end of the ceramic rod of the high-temperature extensometer is secured within the aforementioned V-shaped groove 241 to prevent slippage, thereby ensuring the accuracy of high-temperature strain measurement and the success rate of the test.

[0055] According to the above structural description, the present invention utilizes the anti-slip prefabrication device to clamp and fix itself to the high-temperature ceramic matrix composite test specimen. Two crossbeams that can slide parallel to the long axis of the test specimen are then installed on the positioning fixture, with a positioning groove in the middle of each crossbeam. Before prefabricating the strip-shaped protrusion feature, the ceramic matrix composite test specimen is first clamped and positioned with the auxiliary positioning fixture. Then, according to the installation position requirements of the extensometer ceramic rod front end, the positions of the two crossbeams are adjusted so that the positioning groove is aligned with the installation position of the extensometer ceramic rod front end. Next, a small amount of high-temperature ceramic adhesive is applied to the front ends of two metal rods with a blade-like structure similar to that of the extensometer ceramic rod. The two metal rods are then quickly passed through the positioning groove and pressed against the surface of the test specimen in the correct position, so that the blades at the front ends press against the surface of the test specimen, allowing the applied high-temperature ceramic adhesive to adhere to the surface of the test specimen.

[0056] Then, after a certain period of time for the high-temperature ceramic adhesive to solidify, the two metal rods are removed, thus completing the prefabrication of the two strip-shaped protrusions prepared using the high-temperature ceramic adhesive. The protrusions have a V-shaped groove in the middle, which can effectively limit and fix the front end of the extensometer ceramic rod in subsequent tests, preventing slippage and test failure.

[0057] The main function of the auxiliary positioning fixture in the above process is to limit and fix the metal rod, and to make the operation simple and efficient, so that the position of the prefabricated strip protrusion is accurate and meets the installation position requirements of the ceramic rod of the high temperature extensometer.

[0058] This invention relates to an anti-slip prefabrication device for high-temperature extensometers of test specimens. It employs an auxiliary tooling with a specific structure and function, and utilizes high-temperature ceramic adhesive to rapidly and efficiently prefabricate two strip-shaped protrusions with centrally located V-shaped grooves on the surface of ceramic matrix composite test specimens. These protrusions are used for insertion and positioning of the tip of the high-temperature contact extensometer during subsequent testing, preventing slippage relative to the specimen surface. This ensures the accuracy of strain measurement results and the success rate of high-temperature loading tests on ceramic matrix composites. The anti-slip prefabrication device, with the aid of the designed auxiliary tooling, can rapidly, efficiently, and accurately prefabricate the required strip-shaped protrusions, significantly reducing the amount of high-temperature ceramic adhesive used and lowering testing costs.

[0059] This invention relates to an anti-slip prefabrication device for high-temperature extensometers of test specimens. With the help of the designed auxiliary tooling and method, and using a small amount of high-temperature ceramic adhesive, a strip-shaped protrusion with a centrally located V-shaped groove can be prefabricated at the required position on the surface of the test specimen quickly, efficiently and accurately. This feature is used for the insertion and positioning of the blade at the front end of the ceramic rod of the extensometer and effectively prevents slippage, ensuring the accuracy of strain measurement results and the success rate of the test.

[0060] In summary, the anti-slip prefabrication device for high-temperature extensometers of test specimens of the present invention, with the help of the designed auxiliary tooling and method, and using a small amount of high-temperature ceramic adhesive, can quickly, efficiently and accurately prefabricate strip-shaped protrusions with centered V-shaped grooves at the required positions on the surface of ceramic matrix composite test specimens. This is used for the insertion and positioning of the blade tip of the ceramic rod of the high-temperature extensometer during subsequent high-temperature testing, and effectively prevents it from slipping, thereby ensuring the accuracy of strain measurement results and significantly improving the success rate of the test.

[0061] For those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0062] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0063] Similarly, it should be noted that, in order to simplify the description of the embodiments disclosed in this application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments have fewer features than all the features of a single embodiment disclosed above. Some embodiments use numbers describing the number of components or attributes; it should be understood that such numbers used in the description of embodiments are modified in some examples by the terms "approximately," "about," or "generally."

[0064] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An anti-slipper pre-arrangement for a high temperature extensometer for test pieces, characterized in that, The anti-slip prefabricated device includes: An auxiliary positioning fixture includes a base plate and a set of guide rails. The guide rails are arranged on both sides of the base plate and protrude upwards. An upper groove is formed between the base plate and the guide rails. The test piece is fixedly installed in the upper groove; At least one crossbeam is slidably connected to the guide rail and located above the test piece; At least one metal rod passes through the crossbeam such that the tip of the metal rod presses against the upper surface of the test piece.

2. An anti-slipper pre-assembly for a high temperature extensometer of a test piece according to claim 1, characterized in that, The base plate and the guide rail are integrally formed.

3. The slip-preventing fixture for a high temperature extensometer of a test piece according to Claim 1, wherein The test piece includes a test section, a transition section, and a clamping section connected in sequence.

4. The anti-slip pre-assembly for a high temperature extensometer of a test piece according to claim 3, characterized in that, A support protrusion is provided on the guide rail located on one side of the base plate. The support protrusion extends along the inner side of the guide rail into the upper groove and is used to abut and limit one side of the test section.

5. The anti-slip pre-assembly for a high temperature extensometer of a test piece according to claim 4, characterized in that, The auxiliary positioning fixture also includes at least one tightening nut, which passes through the upper groove from the outside of the guide rail and is used to position and fix it to the other side of the test section.

6. The anti-slip pre-assembly for a high temperature extensometer of a test piece according to claim 5, characterized in that, At least one recessed hole is provided on the base plate portion, the recessed hole is located on the other side of the base plate portion, and the tightening nut is accommodated in the recessed hole.

7. The slip-preventing fixture for a high temperature extensometer of a test piece according to claim 3, wherein A through positioning groove is provided on the crossbeam, and positioning sliders are provided on both sides of the crossbeam extending downwards. The positioning sliders are installed in the corresponding guide rails, and the metal rod passes through the positioning groove.

8. The anti-slip pre-assembly for a high temperature extensometer of a test piece according to claim 7, characterized in that, The upper part of the metal rod is a straight rod structure, and the end of the metal rod is a pointed part. The test section of the test piece is provided with a strip-shaped protrusion, and the pointed part is locked in the strip-shaped protrusion.

9. The anti-slip prefabricated device for a high-temperature extensometer of a test piece as described in claim 8, characterized in that, The strip-shaped protrusion has a V-shaped groove, and the tip is engaged in the V-shaped groove.

10. The anti-slip prefabrication device for a high-temperature extensometer of a test piece as described in claim 8, characterized in that, The tip is coated with high-temperature ceramic adhesive.

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