CN112067454A

CN112067454A - Extensometer anti-slip device in high-temperature extensometer and high-temperature quasi-static loading test

Info

Publication number: CN112067454A
Application number: CN201910496434.8A
Authority: CN
Inventors: 郭洪宝; 洪智亮; 李开元; 梅文斌
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-12-11
Anticipated expiration: 2039-06-10
Also published as: CN112067454B

Abstract

The invention provides an extensometer anti-slip device in a high-temperature quasi-static loading test, which comprises a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; three inner side edges of the U-shaped clamping groove are provided with knife edges; the counterweight block is arranged to ensure that the center of gravity of the clamping piece in a horizontal placing state has a certain distance with the symmetrical center line of the U-shaped clamping groove in the horizontal direction; the back of the back inner side edge of the clamping piece at the bottom side of the U-shaped clamping groove is provided with a connecting device, and the connecting device is used for being in contact fit with the front end of a ceramic extension rod of the high-temperature extensometer in an inserting mode and is fixed and limited. The invention also provides a high-temperature extensometer comprising the anti-slip device. Adopt above-mentioned anti-skidding device can reduce the ceramic extension rod of high temperature extensometer and test the risk of skidding between a material surface by testing.

Description

Extensometer anti-slip device in high-temperature extensometer and high-temperature quasi-static loading test

Technical Field

The invention relates to a high-temperature extensometer, in particular to an extensometer anti-slip device in a high-temperature quasi-static loading test.

Background

With the continuous promotion of novel high temperature structural material design service temperature, need use the high temperature extensometer to measure the quasi-static load deformation data of material under very high ambient temperature. For example, in the ceramic matrix composite material with wide application prospect in the aerospace field, the test temperature of the high-temperature mechanical property is usually 1200 ℃ or even higher. The contact high temperature extensometer that uses at present respectively installs a ceramic extension rod on two measuring arms, and the most advanced of ceramic extension rod front end contacts with the material surface of being tested and relies on frictional force location, and then accomplishes measurement and the transmission of test gauge length section interior material load deflection, and wherein, the ceramic extension rod is ceramic material usually. Only the front half of the ceramic extension rod was in a high temperature environment during the test.

However, the inventor finds that, because the contact area and the friction force between the front end of the high-temperature ceramic extension rod and the surface of the material are small, relative slip is easy to occur in the test process, so that the deformation measurement fails, the test success rate is reduced, and the test cost is increased.

Disclosure of Invention

One object of the present invention is to reduce the risk of slippage between the ceramic extension rod of a high temperature extensometer and the surface of the test piece material being tested.

The invention provides an extensometer anti-slip device in a high-temperature quasi-static loading test, which comprises a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; the width between a left knife edge of the left inner side edge and a right knife edge of the right inner side edge of the U-shaped clamping groove is set to allow a test gauge length section of a tested piece to be clamped into the U-shaped clamping groove; the counterweight block is arranged to ensure that the gravity center of the clamping piece in a horizontal placement state has a certain distance with the symmetrical center line of the U-shaped clamping groove in the horizontal direction, so that when the clamping piece is clamped on the testing gauge length section of the tested piece, pressing force and friction force can be generated between the left knife edge and the right knife edge and the two side surfaces corresponding to the testing gauge length section of the tested piece, and the clamping piece is restrained and fixed on the testing gauge length section of the tested piece without relative sliding by virtue of the pressing force and the friction force; the back of the back inner side edge of the bottom side of the U-shaped clamping groove is provided with a connecting device, and the connecting device is used for being in contact fit with the front end of a ceramic extension rod of the high-temperature extensometer in an inserting mode and fixing and limiting the position.

In one embodiment, the clamping piece comprises a thickness cushion block, and the left or right inner side edge of the U-shaped clamping groove is provided with a detachable thickness cushion block.

In one embodiment, the clamping piece comprises a clamping piece body and a thickness cushion block, the clamping piece body is provided with the U-shaped clamping groove and the balancing weight, the thickness cushion block is arranged to be detachably attached to the left or right inner side edge of the U-shaped clamping groove, and the thickness cushion block provides a cushion block knife edge capable of replacing a left knife edge or a right knife edge.

In one embodiment, the connecting device is a groove disposed on the back surface, and the groove is suitable for inserting the front end of the ceramic extension rod.

In one embodiment, the anti-slip device is made of a ceramic material.

In one embodiment, the weight is integrally formed with the U-shaped slot.

In one embodiment, the center of gravity of the weight block is forward relative to the rear inner side edge of the U-shaped slot.

In one embodiment, the anti-slip device comprises two of said snap-ins.

The invention provides a high-temperature extensometer which comprises two ceramic extension rods and the anti-slip device, wherein the front ends of the two ceramic extension rods are respectively connected with connecting devices of two clamping pieces of the anti-slip device.

In one embodiment, the balancing weights of the two clamping pieces are respectively positioned at the left side and the right side relative to the testing scale distance section of the tested piece.

Through adopting above-mentioned high temperature quasi-static loading test in the extensometer device of preventing skidding, can show the risk that reduces ceramic extension rod and tested between the piece and skid, perhaps, prevent that ceramic extension rod from skidding to avoid deformation measurement's failure, show and improve high temperature mechanical test success rate and then reduce test cost. Moreover, by introducing the test piece connecting device, the relative limit fixation between the ceramic extension rod and the surface of the test piece material can be realized in a high-temperature environment, and the installation operation difficulty of the high-temperature extensometer can be reduced.

Moreover, in the test piece connecting device, the clamping piece with a U-shaped distributed three-side knife edge structure is designed, the compaction contact between the three-side knife edge and the surface of the tested material is realized by the jacking force of the high-temperature extensometer and the self gravity of the clamping piece, and then the relative sliding between the ceramic clamping and the surface of the material is prevented by increasing the contact area and the contact area. The back of joint spare has connecting device such as recess characteristic, can be used for the spacing of inserting of high temperature extensometer ceramic extension pole.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a side rear view of a mounted state of the anti-slip device and the ceramic extension rod.

FIG. 2 is a side front view showing a state in which the anti-slip device is mounted to the ceramic extension rod.

Fig. 3 is a side front view of the clip.

Fig. 4 is a top view of the clip.

Fig. 5 is a side rear view of the snap member.

Fig. 6 is a schematic diagram showing the change of shape and position of the clamping member during the installation process.

Fig. 7 is a force-receiving diagram of the clip in the mounted state when viewed from the front side.

Fig. 8 is a force-receiving diagram of the clip in the mounted state when viewed from the lower side.

Detailed Description

The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth further details for the purpose of providing a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than those described herein, and it will be readily apparent to those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or scope of the invention.

For example, a first feature described later in the specification may be formed over or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated in the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

As used herein, the terms "a," "an," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary words "below" and "beneath" can encompass both an orientation of up and down. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein should be interpreted accordingly. Further, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

It is noted that these and other figures which follow are merely exemplary and not drawn to scale and should not be considered as limiting the scope of the invention as it is actually claimed. Further, the conversion methods in the different embodiments may be appropriately combined.

Referring to fig. 1, for convenience of description, a front-rear direction D1, a left-right direction D2, and an up-down direction D3 are illustrated. The high temperature extensometer 100 generally includes two

ceramic extension rods

101, 102. In the high-temperature quasi-static loading test, the two

ceramic extension rods

101 and 102 are distributed in the vertical direction D3, and the two

ceramic extension rods

101 and 102 can follow up the loaded deformation of the material of the test gauge length section 201 of the tested part 20, so that the measurement of the high-temperature deformation of the material is completed through the position change of the

front ends

101a and 102a of the two

ceramic extension rods

101 and 102. The test gauge length 201 of the device under test 20 is generally a test uniform section of the device under test 20.

Fig. 1 and 2 show a side rear view and a side front view of the mounting state of the extensometer anti-slip device 10 (hereinafter simply referred to as anti-slip device 10) and the

ceramic extension rods

101 and 102 of the high-temperature extensometer 100 on the test gauge length 201 of the tested part 20 in the high-temperature quasi-static loading test. The anti-skid device 10 may also be considered to be included with the high temperature extensometer 100. The anti-slip device 10 includes a clip 1. In the embodiment shown in fig. 1 and 2, the anti-slip device 10 further comprises a clip member 1 'having the same structure as the clip member 1, i.e. the anti-slip device 10 comprises two clip members 1, 1'.

Fig. 3, 4 and 5 show example structures of the clip 1 from different angles. One end (the right end in fig. 4) of the clamping piece 1 is provided with a U-shaped clamping groove 2, and the other end (the left end in fig. 4) is provided with a balancing weight 3. In other words, in fig. 4, the clamping member 1 includes a clamping groove portion 7 at the right end, and a weight block 3 at the left end, and the U-shaped clamping groove 2 is disposed in the clamping groove portion 7.

The three inner sides (i.e., the left inner side 21 on the left side, the right inner side 22 on the right side, and the back inner side 23 on the bottom side or the back side) of the U-shaped card slot 2 are provided with knife edges (i.e., a left knife edge 24, a right knife edge 25, and a back knife edge 26. the width between the left inner side, i.e., the left inner side 21, and the right knife edge 24 and the right knife edge 25 of the right inner side 22, i.e., the left and right direction D2 in fig. 4) of the U-shaped card slot 2 is set to allow the test gauge section 201 of the tested piece 20 to be clamped into the U-shaped card slot 2.

The weight 3 is arranged so that the center of gravity of the clip 1 in the horizontally placed state has a certain distance from the center line C1 of the U-shaped clip groove 2 in the horizontal direction, that is, the left-right direction D2 in fig. 4. The center line of symmetry C1 extends along the front-rear direction D1, and the left and

right edges

24, 25 are symmetrical in the horizontal or left-right direction D2 with the center line of symmetry C1, i.e., the distance of the left edge 24 from the center line of symmetry C1 in the left-right direction D2 is the same as the distance of the right edge 25 from the center line of symmetry C1 in the left-right direction D2. In the illustrated embodiment, the weight member 3 moves the center of gravity of the clip 1 in the horizontally placed state to the side of the weight member 3, that is, to the left side with respect to the center line of symmetry C1. The gravity center of the clamping member 1 in the horizontal placement state has a certain distance with the symmetrical center line C1 of the U-shaped clamping groove 2 in the horizontal direction, so that when the clamping member 1 is clamped on the testing gauge length section 201 of the tested piece 20, a pressing force and a friction force are generated between the left knife edge 24 and the right knife edge 25 and the corresponding two side surfaces of the testing gauge length section 201 of the tested piece 20, namely the left side surface 202 and the right side surface 203 of fig. 2, and by means of the pressing force and the friction force, the clamping member 1 is restrained and fixed on the testing gauge length section 201 of the tested piece 20 without relative sliding.

The clip 1 is provided with a connecting device on the back 27 of the inner side edge 23 of the bottom side (i.e. the bottom side of the U-shape, the back side in fig. 4) of the U-shaped clip slot 2, and the connecting device is used for being inserted into the

front ends

101a and 102a of the

ceramic extension rods

101 and 102 of the high temperature extensometer 100 to be matched with each other for fixing and limiting. Referring to fig. 5, the connecting means is a groove 61 (or receptacle) provided in the back surface 27. The groove 61 is adapted for insertion of the

front end

101a, 102a of the

ceramic extension rod

101 or 102. The recess 61 may be shaped to match the shape of the

front end

101a, 102a of the

ceramic extender

101 or 102, for example tapered, to accommodate its insertion. The front ends 101a and 102a of the

ceramic extension rods

101 and 102 are inserted into the grooves 61, the front ends 101a and 102a of the

ceramic extension rods

101 and 102 are connected with the clamping piece 1 from the rear side to realize the limiting fixation between the two, the

ceramic extension rods

101 and 102 can follow the clamping piece 1, and the

ceramic extension rods

101 and 102 can apply pressing force to the clamping piece 1 from the rear side, so that the pressing force and the friction force between the rear knife edge 26 and the testing scale distance section 201 of the tested piece 20 are increased.

Referring to fig. 2 to 4, the clip member 1 may further include a thickness pad 4, and the left or right inner side of the U-shaped clip slot 2, i.e. the left inner side 21 or the right inner side 22, is provided by the detachable thickness pad 4, and in the illustrated embodiment, the left inner side 21 of the U-shaped clip slot 2 is provided by the detachable thickness pad 4. At this time, the left knife edge 24 of the U-shaped slot 2 is also the pad knife edge of the thickness pad 4. The width between the block edge or left edge 24 of the thickness block 4 and the right edge 25 of the U-shaped pocket 2 (or pocket portion 7) (i.e., the dimension in the left-right direction D2 in fig. 4) is set to allow the test gauge length 201 of the test piece 20 to be snapped thereinto. For example, for the tested pieces with different test gauge length widths, the thickness spacers 4 with different thicknesses may be selected, that is, the thickness spacers 4 with different thicknesses may be selected according to the width of the test gauge length 201 of the tested piece 20, so that the width between the left knife edge 24 of the thickness spacer 4 and the right knife edge 25 of the card slot portion 7 is slightly greater than the width of the test gauge length 201 of the tested piece 20, and the test gauge length 201 of the tested piece 20 may be clamped therein.

In the illustrated embodiment, the clip 1 includes a clip body 8 and a thickness pad 4. The clamping piece body 8 is provided with a U-shaped clamping groove 2 (or a clamping groove part 7) and a balancing weight 3, the thickness cushion block 4 is arranged to be detachably attached (detached/attached) to the left or right inner side edge (in the figure, the left inner side edge 21) of the U-shaped clamping groove 2, the thickness cushion block 4 provides a cushion block knife edge capable of replacing a left knife edge or a right knife edge (in the figure, the left knife edge), namely, the cushion block knife edge of the thickness cushion block 4 can be used as a left knife edge 24 instead of the original left knife edge of the U-shaped clamping groove 2 as shown in the figure, therefore, the cushion block knife edge of the thickness cushion block 4 is hereinafter referred to as the left knife edge 24, and for the purpose of distinguishing. At this time, when the width of the test gauge length section 201 of the tested part 20 is slightly larger than the width of the joint knife edge 211 of the clamping part body 8 and the right knife edge 25, the clamping part body 8 can be directly used without using the thickness cushion block 4, that is, the joint knife edge 211 of the clamping part body 8 serves as the left knife edge 24. When the width of the test gauge length section 201 of the tested part 20 is larger than the width of the joint knife edge 211 and the right knife edge 25 of the clamping part body 8, the cushion block 4 with proper thickness is selected, and at the moment, just as shown in the figure, the cushion block knife edge of the cushion block 4 serves as the left knife edge 24 and is in contact with the test gauge length section 201 of the tested part 20.

In the illustrated embodiment, the thickness pad 4 is provided as a V-shaped member having an inner surface 41 that abuts the engagement edge 211 of the clip body 8. The thickness cushion block 4 has a V-shaped inner surface 41 and a V-shaped outer surface 42, and the thickness cushion block 4 can be stacked on the engagement blade 211 of the clip body 8 by the inner surface 41 abutting against the engagement blade 211 of the clip body 8.

Fig. 6 is a schematic diagram showing the shape and position changes of the clip 1 of the anti-slip device 10 during the installation process, wherein the dotted line represents the horizontal placement state of the clip 1, and the solid line represents the installation completion state of the clip 1. Fig. 7 and 8 are force receiving diagrams of the clip 1 in the mounted state, as viewed from the front side and the lower side, respectively.

With reference to fig. 6 to 8, in the mounting process, the clip 1 is horizontally placed at the upper end of the test gauge length section 201 of the tested device 20, so that the right knife edge 25 of the clip body 8 or the clip groove portion 7 of the clip 1 is contacted and attached to the material surface of the tested device 20, the tested device 20 will generate a normal reaction force F1 and a static friction force T1 on the right knife edge 25, and then the thickness pad 4 is placed between the joint knife edge 211 of the clip body 8 and the test gauge length section 201 of the tested device 20 according to the state shown by the dotted line in fig. 6, that is, the horizontally placed state. Then the clamping piece 1 is loosened, under the action of the balancing weight 3, under the influence that the gravity center of the clamping piece 1 is not coincident with the symmetrical center line C1 of the U-shaped clamping groove 2 in the horizontal direction, the clamping piece 1 rotates clockwise in the figure 6 under the combined action of the self gravity G and the static friction force T1, in other words, the clamping piece 1 generates a turning motion trend, after the clamping piece rotates by a tiny angle, the cushion block knife edge or the left knife edge 24 of the thickness cushion block 4 is contacted and attached to the upper end material surface of the testing gauge length section 201 of the tested piece 20, and a normal reaction force F2 and a static friction force T2 are generated to prevent the clamping piece 1 from continuing to rotate, in other words, the testing gauge length section of the tested piece generates a limiting effect on the clamping piece 1 to limit the turning motion trend of the clamping piece. In the installation state, because the above-mentioned rotation angle is very small, the right knife edge 25 and the left knife edge 24 are still at the same level, and the small height difference will not cause large error to the measuring result, and at the same time will not affect the relative fixation of the clamping member 1 on the tested part 20.

Under the combined action of the forces F1, T1, F2, T2 and G, the clamping piece 1 is in a force balance state and is clamped and fixed at the upper end of the test gauge length section 201 of the tested device 20. Another clip 1' can be installed at the lower end of the test gauge length 201 of the tested device 20 according to the same operation. Finally, two

ceramic extension rods

101 and 102 of the high-temperature extensometer 100 are respectively inserted into the corresponding grooves 61 of the clamping pieces 1 and 1' to complete the fixing and limiting of the two; meanwhile, the

ceramic extension rods

101 and 102 exert a pressing force Fd on the clamping members 1 and 1 ' in the axial direction, i.e. the front-back direction D1 in the figure, so that the material surface of the tested piece testing gauge section 21 generates a reaction force F3 and a friction force T3 on the rear knife edge 26 of the clamping members 1 and 1 ', and the fixing limit between the clamping members 1 and 1 ' and the tested piece 20 is firmer under the action of the T3. Therefore, the limit fixation between the

ceramic extension rods

101 and 102 of the high-temperature extensometer 100 and the tested part 20 is completed by the clamping pieces 1 and 1'. Subsequent warm-up and load tests may be performed. In the test process, the upper clamping piece 1 and the lower clamping piece 1' are along with the loaded deformation of the material of the test gauge length section 201 of the tested piece 20, so that the front ends 101a and 101b or the tip positions of the

ceramic extension rods

101 and 102 are driven to change, and the measurement of the high-temperature deformation of the material is completed. And after the test is finished, disassembling according to the reverse order of installation.

The anti-slip device 10 (or the clip 1) may be made of a ceramic material. In the test process, the clamping piece 1 and the

front ends

101a and 102a of the

ceramic extension rods

101 and 102 are completely in a high-temperature environment, and are not easy to deform and damage in a high-temperature test environment, so that the corresponding deformation measurement accuracy is ensured. The anti-slip device 10 may be made of the same or similar material as the

ceramic extension rods

101 and 102 of the high temperature extensometer 100, and has the same or better high temperature resistance.

In the illustrated embodiment, the weight 3 is integrally formed with the U-shaped notch 2 (or the notch portion 7). The weight 3 may also serve as a handle for handling the anti-slip device 10 during installation and may be designed to be of a shape suitable for handling. In the illustrated embodiment, the height of the weight 3 in the vertical direction D3 is larger than the height of the notch portion 7 in which the U-shaped notch 2 is provided, the width of the weight 3 in the left-right direction D2 is slightly smaller than the width of the notch portion 7, and the thickness of the weight 3 in the front-rear direction D1 is substantially equal to the thickness of the notch portion 7.

Referring to fig. 4, the center of gravity of the weight 3 is located forward relative to the bottom or rear inner edge 26 of the U-shaped slot 2. Therefore, when the U-shaped clamping groove 2 of the clamping piece 1 is clamped with the testing scale distance section 201 of the tested part 20, the gravity center of the balancing weight 3 can be generally aligned with the center of the testing scale distance section 201 of the tested part 20 in the front-back direction D1, and therefore the balancing weight function is better achieved.

Returning to fig. 1 and 2, the

front ends

101a, 102a of the two

ceramic extension rods

101, 102 of the high temperature extensometer 100 are respectively connected with the two clips 1, 1' (specifically, the connecting means or the groove 61 thereof) of the anti-slip device 10. In the illustrated embodiment, the weight blocks 3 of the two clamping members 1 and 1' are respectively located at the left and right sides of the tested object 20 (or the test gauge length section 201).

The anti-slip device 10 can assist in completing the limit fixation of the

ceramic extension rods

101 and 102 of the high-temperature extensometer 100 in the high-temperature quasi-static mechanical test of the material between the upper end material surface and the lower end material surface of the test gauge length section 201 of the tested part 20. In the loading process, the variation of the relative position between the upper and lower clamping members 1 and 1 'is the loaded deformation of the material in the test gauge length section 201 of the tested part 20, the upper and lower clamping members 1 and 1' simultaneously drive the position change of the front ends 101a and 101b of the upper and lower

ceramic extension rods

101 and 102, and the loaded deformation of the material in the test gauge length section 201 is equivalently transmitted to the high-temperature extensometer 100 for measurement and recording.

The anti-slip device increases the contact area and the contact area between the surface of a material to be tested and the ceramic extension rod of the high-temperature extensometer, can obviously reduce the slip risk between the surface of the material to be tested and the ceramic extension rod of the high-temperature extensometer, avoids the failure of deformation measurement, has beneficial effects on improving the success rate of high-temperature mechanical tests of the material and reducing the test cost, also reduces the installation and operation difficulty of the high-temperature extensometer, and is favorable for the high-efficiency development of the high-temperature mechanical property test work of the material.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. An extensometer anti-slip device in a high-temperature quasi-static loading test is characterized by comprising a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; the width between a left knife edge of the left inner side edge and a right knife edge of the right inner side edge of the U-shaped clamping groove is set to allow a test gauge length section of a tested piece to be clamped into the U-shaped clamping groove;

the counterweight block is arranged to ensure that the gravity center of the clamping piece in a horizontal placement state has a certain distance with the symmetrical center line of the U-shaped clamping groove in the horizontal direction, so that when the clamping piece is clamped on the testing gauge length section of the tested piece, pressing force and friction force can be generated between the left knife edge and the right knife edge and the two side surfaces corresponding to the testing gauge length section of the tested piece, and the clamping piece is restrained and fixed on the testing gauge length section of the tested piece without relative sliding by virtue of the pressing force and the friction force;

the back of the back inner side edge of the bottom side of the U-shaped clamping groove is provided with a connecting device, and the connecting device is used for being in contact fit with the front end of a ceramic extension rod of the high-temperature extensometer in an inserting mode and fixing and limiting the position.

2. The device of claim 1, wherein the clamping member comprises a thickness pad, and the left or right inner side of the U-shaped clamping groove is provided by the detachable thickness pad.

3. The device of claim 1, wherein the clip comprises a clip body having the U-shaped slot and the weight block, and a thickness block configured to be detachably attached to the inner left or right side of the U-shaped slot, wherein the thickness block provides a block edge that can replace the left or right edge.

4. The device for preventing the slip of the extensometer in the high-temperature quasi-static loading test of claim 1, wherein the connecting device is a groove arranged on the back surface, and the groove is suitable for the insertion of the front end of the ceramic extension rod.

5. The extensometer anti-slip device of claim 1 wherein the anti-slip device is made of a ceramic material.

6. The device of claim 1, wherein the weight block is integrally formed with the U-shaped slot.

7. The device of claim 1, wherein the weight has a center of gravity that is forward of the inner rear edge of the U-shaped slot.

8. The device for preventing the slip of the extensometer in the high temperature quasi-static loading test of claim 1, wherein the device for preventing the slip comprises two clamping pieces.

9. A high temperature extensometer, includes two ceramic extension poles, characterized in that, still includes the device that skids of preventing of any one of claims 1 to 8, the front end of two ceramic extension poles respectively with prevent the connecting device of the two joint spare of device that skids and be connected.

10. The high temperature extensometer of claim 9 wherein the weights of the two clamps are located on the left and right sides, respectively, relative to the test gauge length of the test piece.