CN110501217A - A creep compression fixture - Google Patents

Abstract

The invention provides a creep compression fixture, which includes a commutator, the commutator includes an upper pressing block and a lower pressing block, and the bottom surface of the upper pressing block and the top surface of the lower pressing block are respectively provided with holes for the end of the sample to extend into. The upper and lower positioning holes in the shape of a triangular prism, the upper and lower pressure block side walls corresponding to the upper and lower positioning holes are respectively provided with upper and lower fastening holes from the outside to the upper and lower positioning holes. Such a clamping part. The invention optimizes the parallelism between the sample and the center of the compression fixture during the installation process, ensures the centering of the sample during the compression process, reduces the difference in deformation between the left and the right, and improves the test accuracy. The test stress range is expanded to ensure the repeatability, integrity and operation safety of the test data. It simplifies the test steps, saves test time, greatly reduces the amount of samples used and the number of times the machine is used, and is more energy-saving and environmentally friendly.

Description

A creep compression fixture

technical field

The invention relates to creep test equipment, in particular to a creep compression fixture.

Background technique

With the rapid development of my country's industry, creep age forming technology is also making continuous progress. Creep age forming technology is the main forming technology for large-scale panels such as aircraft and rockets. In the actual creep age forming of aluminum alloy and other materials Previously, finite element software was generally used for creep aging forming simulation, and the most suitable actual forming scheme was determined through software simulation. Before the creep aging forming simulation of the material, the creep performance of the material should be tested. A creep testing machine is commonly used. The material to be tested is processed into a sample, and the sample is clamped in the creep testing machine. Between the upper and lower tensile rods, the creep tension or compression test is carried out on the sample at the set creep aging temperature to obtain the tensile or compressive creep of the sample, and then to obtain the creep curve of the material. To provide the creep age forming simulation model, and finally used to guide the actual creep age forming.

When the existing creep testing machine performs the creep compression test on the sample, the rod-shaped sample is generally used for the test. The two ends of the rod-shaped sample are provided with external threads, and the connection mode between the two ends of the rod-shaped sample and the compression fixture is direct or indirect. For example, a creep compression test device disclosed in Chinese patent 201910244627.4, the upper end of the sample is threaded with the upper pressure block, and the lower end is threaded with the tapered locator, which is formed by the cone on the lower pressure block. The holes are positioned to enhance specimen centering. Since there is also an installation gap when the thread is screwed, there is still a possibility that the sample may shake slightly left and right during the compression process, and the neutrality is not good enough, and the left and right deformation of the sample during the creep aging test There is a certain difference in the quantity, which affects the accuracy of the test data. Therefore, a better solution is needed in the prior art to solve this problem.

Contents of the invention

The purpose of the present invention is to provide a creep compression fixture to solve the problems raised in the background technology.

A creep compression fixture, including a clamping part 1, a clamping part 2 and a commutator for connecting between the upper and lower connectors of a creep testing machine, the commutator includes an upper pressing block and a lower pressing block, There is a distance between the upper pressing block and the lower pressing block along the tensile direction of the creep testing machine for installing the sample, and the distance value can be adjusted, and the smaller the distance is used to provide creep compression loading operation for the sample , used to unload the sample when the distance can be increased;

The bottom surface of the upper pressing block is provided with a triangular prism-shaped upper positioning hole for the upper end of the sample to extend into, and the top surface of the lower pressing block is provided with a lower triangular prism-shaped positioning hole for the lower end of the sample to extend into. Align with the lower positioning hole along the axial direction of the tensile rod of the creep testing machine and the position, contour and size of the two are the same, the inner surfaces of the upper positioning hole and the lower positioning hole are smooth surfaces, and the diameter of the inscribed cylinder of the two Greater than the diameter of the end of the sample to be inserted, so that the sample can be inserted smoothly;

The position corresponding to the upper positioning hole on the side wall of the upper pressing block is provided with an upper fastening hole penetrating from the outside to the upper positioning hole, the axis of the upper fastening hole intersects with a side edge of the upper positioning hole, and the upper fastening hole The first tightening part is arranged in the hole, and the first tightening part is used to press against the outer wall of the upper end of the sample along the axial direction of the upper fastening hole, so that the upper end of the sample fits with the other two side walls of the upper positioning hole and forms a phase. The positional relationship between the two side walls is locked and the intersection line of the two side walls is the side edge intersecting the axis line of the upper fastening hole;

The position corresponding to the lower positioning hole on the side wall of the lower pressing block is provided with a lower fastening hole penetrating from the outside to the lower positioning hole, the axis line of the lower fastening hole intersects with a side edge of the lower positioning hole, The second fastening part is arranged in the fastening hole, and the second fastening part is used to press against the outer wall of the lower end of the sample along the axial direction of the lower fastening hole, so that the lower end of the sample and the two side walls of the lower positioning hole fit together Forming a tangential positional relationship and being locked, the intersection line of the two side walls is the side edge intersecting the axis line of the lower fastening hole;

The axis lines of the upper fastening hole and the lower fastening hole are located in the same plane parallel to the axial direction of the tensile rod of the creep testing machine, so that the upper and lower ends of the sample are respectively pressed by the fastening part one and the fastening part When the two ends are pressed tightly and are respectively tangent to the upper and lower positioning holes, the upper end and the lower end of the sample are just located in the same plane parallel to the axial direction of the tensile rod of the creep testing machine, so as to realize the centering of the sample. , to prevent premature bending of the specimen in the creep compression test.

Preferably, the axis line of the upper fastening hole perpendicularly intersects a side edge of the upper positioning hole, and the axis line of the lower fastening hole perpendicularly intersects a side edge of the lower positioning hole.

Further, both the upper fastening hole and the lower fastening hole are threaded holes with internal threads, the first tightening part and the second tightening part are bolts or screws with external threads, and the first and second tightening parts are bolts or screws with external threads. The second fastening part is respectively rotated in the upper fastening hole and the lower fastening hole toward the direction close to the sample to fasten the sample respectively.

Preferably, the depth of the upper positioning hole and the lower positioning hole is less than or equal to the length of the end to be inserted into the sample, and the depth of the upper positioning hole and the lower positioning hole is greater than or equal to the length of the end to be inserted into the sample. 1/2 of the length of the part to ensure the firmness of the clamping without affecting the connection between the upper and lower lugs of the sample and the extension device.

Further, the commutator also includes an upper guide rod, a lower guide rod, an upper stretch rod and an upper connecting block located above the upper pressing block, and a lower stretching rod and a lower connecting block located below the lower pressing block. The upper end of the tensile rod is used to connect the upper connector of the creep testing machine, the lower end of the upper tensile rod is fixedly connected with the upper connecting block, the lower end of the lower tensile rod is used to connect the lower connector of the creep testing machine, and the pull-down The upper end of the extension rod is fixedly connected with the lower connection block, and the upper guide rod passes through the guide holes provided on the upper connection block, the upper pressing plate and the lower pressing plate from top to bottom, and the middle part of the upper guiding rod is set on the upper pressing block In the set guide hole, the upper end of the upper guide rod has a shaft shoulder and this end is fixedly connected with the upper connecting block through nut one, and the lower end of the upper guide rod passes through the guide hole on the lower pressing block and is connected with nut two; Go through the guide holes provided on the lower connecting block, the lower pressing plate and the upper pressing plate in turn from bottom to top, the middle part of the lower guide rod is set in the guide hole provided on the lower pressing block, and the upper end of the lower guiding rod passes through the guide hole on the upper pressing block. A nut three is connected behind the guide hole, and the lower end of the lower guide rod has a shaft shoulder and this end is fixedly connected with the lower connecting block by a nut four. Both the upper pressing block and the lower pressing block can slide relative to the upper and lower guide rods, and the distance between the upper pressing block and the lower pressing block for installing the sample can be adjusted manually.

The present invention has at least the following beneficial effects:

In the present invention, by changing the clamping mode between the compression fixture and the bar-shaped sample, the center of the sample is poor due to the installation gap between the sample and the compression fixture during the compression creep test, resulting in a large gap between the left and right deformation of the sample. , the problem of poor creep measurement accuracy, the present invention is mainly used in measuring the tiny deformation during uniaxial compression creep aging test, and the present invention can solve the following problems:

1. Optimize the parallelism between the sample and the center of the compression fixture during the installation process, ensure the centering of the sample during the compression process, reduce the difference between the left and right deformations, and significantly improve the measurement accuracy of small deformations.

2. Solve the problem that the aging time cannot meet the test requirements due to the easy bending of the sample at a high stress level, expand the test stress range, ensure the integrity of the test data, and provide more comprehensive test results for scientific research .

3. It reduces the possibility of instability and bending of the sample during the compression process, so that the stability of the sample is better, and the safety of the testing machine is well guaranteed. Moreover, the accuracy and repeatability of the test measurement data are good, avoiding the phenomenon of repeated tests when using the previous compression fixture, simplifying the test steps, saving test time, and greatly reducing the amount of samples used and the number of times the machine is used. More energy saving and environmental protection.

When using the creep compression fixture of the present invention for testing, the external thread structure at both ends of the existing rod-shaped sample can be changed into a smooth cylindrical structure, which is used to extend into the upper and lower positioning holes. The contact area between the positioning holes can enhance the clamping firmness of the sample, and on the other hand, it can reduce the steps required to process the sample to the finished product, saving labor and cost.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the overall installation structure diagram of the creep compression fixture of the preferred embodiment of the present invention;

Fig. 2 is an enlarged view of details at the clamping position of the creep compression fixture sample of the preferred embodiment of the present invention;

Fig. 3 is the internal cross-sectional structural diagram at the clamping position of the specimen of the creep compression fixture according to the preferred embodiment of the present invention;

Fig. 4 is the curve diagram of the variation with time of the amount of deformation obtained by the first group of compression creep test tests carried out with existing compression fixtures;

Fig. 5 is the curve diagram of the variation with time of the amount of deformation obtained by the first group of second compression creep test tests carried out with existing compression fixtures;

Fig. 6 is the curve diagram of the deformation with time obtained by the second group of compression creep tests carried out with the creep compression fixture of the preferred embodiment of the present invention;

Fig. 7 is a graph showing the variation of deformation with time obtained from the third set of compression creep tests performed with the creep compression fixture of the preferred embodiment of the present invention.

In the figure: 1- upper pressing block, 11- upper positioning hole, 12- upper fastening hole, 13- upper guide rod, 14- upper stretching rod, 15- upper connecting block, 16- nut one, 17- nut three , 2-lower pressure block, 21-lower positioning hole, 22-lower fastening hole, 23-lower guide rod, 24-lower tension rod, 25-lower connecting block, 26-nut two, 27-nut four, 3 -sample, 4-jacking part 1, 5-jacking part 2.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered by the claims.

Referring to Fig. 1 to Fig. 3, a kind of creep compression fixture includes the first tightening part 4, the second tightening part 5 and the upper and lower connectors for connecting to the creep testing machine (that is, the upper connector and the lower connector, in the figure not shown), the commutator includes an upper briquetting block 1 and a lower briquetting block 2, between the upper briquetting block and the lower briquetting block is maintained along the tensile direction of the creep testing machine for installing the sample 3 The spacing value can be adjusted under the driving of the creep testing machine, the spacing can be small to provide creep compression loading operation for the sample, and the spacing can be large to unload the sample 3; In this embodiment, the outer walls of the upper and lower ends of the sample 3 are provided with external threads.

The bottom surface of the upper pressing block is provided with a triangular prism-shaped upper positioning hole 11 for the upper end of the sample to extend into, and the top surface of the lower pressing block is provided with a triangular prism-shaped lower positioning hole 21 for the lower end of the sample to extend into. Align with the lower positioning hole along the axial direction of the tensile rod of the creep testing machine and the position, contour and size of the two are the same, the inner surface of the upper positioning hole and the lower positioning hole is smooth, and the diameter of the inscribed circle of the two is larger than that Into the diameter of the end of the sample; in this embodiment, the cross-sections of the upper positioning hole and the lower positioning hole are equilateral triangles.

The position corresponding to the upper positioning hole on the side wall of the upper pressing block is provided with an upper fastening hole 12 penetrating from the outside to the upper positioning hole. The axis line of the upper fastening hole intersects with a side edge of the upper positioning hole, and the upper fastening hole There is a tightening part 1 inside, and the end of the tightening part 1 presses against the outer wall of the upper end of the rod-shaped sample along the axial direction of the upper fastening hole, so that the upper threaded end of the rod-shaped sample fits together with the other two side walls of the upper positioning hole. Forming a tangential positional relationship, the intersection line of the two side walls is the side edge intersecting the axis line of the upper fastening hole;

The position corresponding to the lower positioning hole on the side wall of the lower pressing block is provided with a lower fastening hole 22 penetrating from the outside to the lower positioning hole. The axis line of the lower fastening hole intersects with a side edge of the lower positioning hole. The top tightening part 2 is provided, and the end of the top tightening part 2 presses against the outer wall of the lower end of the rod-shaped sample along the axial direction of the lower fastening hole, so that the lower threaded end of the rod-shaped sample fits and forms a joint with the two side walls of the lower positioning hole. Tangential positional relationship, the intersection line of the two side walls is the side edge intersecting the axis line of the lower fastening hole;

In this embodiment, the axes of the upper fastening hole and the lower fastening hole are set along the horizontal direction and are located in the same plane parallel to the axial direction of the tensile rod of the creep testing machine, so that the upper and lower ends of the sample are respectively When the top tightening part 1 is pressed against the top tightening part 2 and is respectively tangent to the upper and lower positioning holes, the upper end and the lower end of the sample are also just located in the same plane parallel to the axial direction of the tensile rod of the creep testing machine, so that Achieving centering of the specimen prevents premature bending of the specimen during creep compression testing.

In this embodiment, the axis line of the upper fastening hole perpendicularly intersects a prism surface of the upper positioning hole, and the side edge opposite to the prism surface also perpendicularly intersects the axis line of the upper fastening hole, and the lower fastening hole The axis line perpendicularly intersects a prism surface of the lower positioning hole, and the side edge opposite to the prism surface also perpendicularly intersects the axis line of the lower fastening hole.

In this embodiment, the depth of the upper positioning hole and the lower positioning hole is equal to the length to be inserted into the end of the sample, so as to ensure the firmness of the clamping without affecting the connection between the upper and lower lugs of the sample and the extension device. .

In this embodiment, the commutator also includes an upper guide rod 13, a lower guide rod 23, an upper stretch rod 14 and an upper connecting block 15 positioned above the upper pressing block, and a lower stretch rod 24 and an upper connecting block positioned below the lower pressing block. Lower connecting block 25, the upper end of the upper tensile rod is used to connect the upper connector of the creep testing machine, the lower end of the upper tensile rod is fixedly connected with the upper connecting block, and the lower end of the lower tensile rod is used for connecting the creep testing machine. The lower connecting head, the upper end of the lower stretching rod is fixedly connected with the lower connecting block, the upper guiding rod passes through the guiding holes provided on the upper connecting block, the upper pressing plate and the lower pressing plate sequentially from top to bottom, and the middle part of the upper guiding rod passes through Set in the guide hole provided on the upper pressing block, the upper end of the upper guide rod has a shaft shoulder and this end is fixedly connected with the upper connecting block through a nut-16, and the lower end of the upper guide rod passes through the guide hole on the lower pressing block and is connected with a Nut 2:26. The lower guide rod passes through the guide holes set on the lower connecting block, the lower pressing plate and the upper pressing plate in sequence from bottom to top. The guide hole on the briquetting block is connected with nut three 17 behind, and the lower guide rod lower end has an axle shoulder and this end is fixedly connected with the lower connecting block by nut four 27. Both the upper pressing block and the lower pressing block can slide relative to the upper and lower guide rods, and the distance between the upper pressing block and the lower pressing block for installing the sample 3 can be manually adjusted.

In this embodiment, both the first tightening component and the second tightening component use bolts with inner hexagonal holes.

When clamping the sample, put the upper and lower ends of the sample into the upper and lower positioning holes in the shape of a triangular prism. The locked hexagon socket bolts use the locking method of top-tight radial force to lock both ends of the sample in the positioning holes of the triangular prism. At this time, the connection between the sample and the commutator is completed, because the upper and lower The two positioning holes are completely parallel, and the sample and the commutator will not shake left and right during the installation process, which ensures the parallelism between the sample and the compression fixture and reduces the asymmetry of the sample's left and right deformation during the compression creep test. The phenomenon makes the test data more accurate, and because of the good neutrality, the stability of the sample is better, which solves the problem that the sample is prone to bending under a high stress level.

During the test, the driving system of the creep testing machine transmits the force to the upper and lower movable rods, so that the upper and lower rods move up and down respectively, and the required compressive stress state of the sample is realized by the commutator, which will The tensile stress of the transformer is converted into the compressive stress of the sample.

After the sample is fixed, the upper and lower extension rod groups are installed on the sample, and the displacement sensor is connected under the extension rod to measure the deformation data of the sample in real time. A thermocouple is fixed on the middle surface of the sample to ensure that the temperature of the sample is consistent with the test setting. The temperature in the creep machine furnace is basically the same. Set specific test parameters, test steps and data collection frequency of each step on the computer controlling the creep machine.

After the test, the detailed creep data can be obtained from the PC display screen of the creep testing machine, including left deformation, right deformation, average deformation and relative elongation. Among them, the coincidence of the left and right deformation curves with time is an important reference for judging the uniformity of sample deformation and whether the sample is bent. If the left and right deformations are basically the same, it means that the sample deformation is relatively uniform and there is basically no bending. , the creep data at this time is highly accurate and can be used for subsequent scientific analysis.

In order to verify the beneficial effect of the creep compression fixture of the present invention on the neutrality and stability of the sample, the present invention uses the SUST-D5 creep testing machine produced by Zhuhai Sansi Taijie Electric Equipment Co., Ltd. as the test equipment, and the creep test The error accuracy of machine force control is ±3N, and the temperature control accuracy of the supporting auxiliary heating furnace is ±2°C. The overall creep measurement system includes: the upper extension rod group, the lower extension rod group and the displacement sensor outside the furnace. During the creep aging process, the creep value of the sample is transmitted to the displacement sensor outside the furnace for reading through the left and right extension rods of the upper extension rod group and the lower extension rod group. The displacement sensor is a grating line displacement sensor with an accuracy of 5×10 ^-4 mm.

The above-mentioned creep testing machine was used to conduct the uniaxial constant stress compression creep aging comparison test. The tests were divided into three groups. The samples used in the three groups of tests were all 2219 aluminum alloy creep samples with the same state. The specimens used were externally threaded at both ends, where:

The first group uses the existing compression fixture (the selected existing compression fixture is the same as the structure disclosed in Chinese patent 201910244627.4) to conduct three compression creep tests on the sample under the same test conditions. The test conditions are: test temperature 165°C, The heating rate is 5°C/min, the aging time is 9h, and the stress is 120MPa;

The second group carries out three identical compression creep tests to the sample with the creep compression fixture of the present invention, and the test conditions are identical with the first group of test conditions;

The third group used the creep compression fixture of the present invention to perform two identical compression creep tests on the sample, except that the stress was 180 MPa, and the other test conditions were the same as the second group.

The creep values of the first group of three tests were respectively 0.27% for the first time (see the graph of Figure 4 for details), 0.215% for the second time (see the graph of Figure 5 for details), 0.259% for the third time, and 0.259% for the third time. The difference between the left and right deformations of the first, second, and third tests were 0.022mm, 0.029mm, and 0.018mm (about 21%, 32%, and 18%) respectively, but the difference between the left and right deformations is still relatively large. It can be seen that when the creep test is performed with the existing compression fixture, the repeatability of the test is poor, and the accuracy of the test data is not high, which causes great difficulties in the analysis of the test data, and it is necessary to carry out repeated tests to determine the accuracy. test results;

The left and right deformations of the second group of three tests were all between 0.011-0.014mm (13%-17% difference between the left and right), and the strain curves of the three tests over time can basically be represented by the graph in Figure 6;

The difference between the left and right deformations of the two tests of the third group is between 0.013-0.016mm (the difference between the left and right is 11%-15%).

From the above data, it can be seen that the creep compression fixture of the present invention represented by the second group and the third group of tests is significantly smaller than the existing compression fixture, and the experimental data has high repeatability. Generally, two identical tests are carried out. More accurate test data can be determined.

In addition, during the three sets of tests, the inventors found that the existing compression fixtures still vibrate slightly after installation due to the gap connection between the sample and the commutator during the sample installation process, while the creep aging test The variable is small and the measurement is very precise. Even a slight shaking has a great influence on the left and right deformation of the sample during creep aging. Therefore, the tester needs to rely on the parallelism between the visual test sample and the compression fixture to ensure the accuracy of the data as much as possible , but this method has high requirements for the operation of the test personnel, and the uncertainty of the test results is large. Therefore, the accuracy of creep data measured by existing compression fixtures is not high enough, and only approximate data ranges and test rules can be obtained.

However, the improved compression fixture assembly of the present invention no longer requires testers to rely on visual inspection in the process of installing the sample, the installation operation is simple, and the accuracy of the test data is high, which can basically be accurate to specific values, avoiding repeated operations of the test, The test time is greatly shortened, and the test stress range is expanded, which provides a reliable guarantee for scientific researchers to conduct high-precision data analysis and theoretical research. At the same time, the use of samples is greatly reduced, which effectively saves the use of materials and processing costs, and conforms to the concept of energy saving and environmental protection.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. a kind of creep compression clamp, which is characterized in that including holding out against component one (4), holding out against component two (5) and for being connected to Creep testing machine is vertically connected with the commutator between head, and the commutator includes upper holder block (1) and lower lock block (2), upper holder block with Draw direction between lower lock block along creep testing machine maintains the spacing for installing sample (3), and the distance values can be adjusted It is whole, for providing the operation of creep compression-loaded to sample when the spacing becomes smaller, for unloading sample when the spacing becomes larger；

The bottom surface of the upper holder block is provided with the upper location hole (11) of the triangular prism shape protruded into for sample upper end, the top surface of lower lock block The lower Positioning holes (21) of the triangular prism shape protruded into for sample lower end are provided with, upper location hole and lower Positioning holes are along creep testing machine Stretch rod axial direction is aligned and the two position, profile and size are all the same, and the inner surface of upper location hole and lower Positioning holes is Smooth surface and the inscribed cylinder diameter of the two are greater than the diameter of sample end to be protruded into, so that sample smoothly protrudes into；

The position of the corresponding upper location hole of the upper holder block side wall is provided with from the external upper fastener hole (12) for penetrating through supreme location hole, The axial line of the upper fastener hole intersects with an incline of upper location hole, is provided in upper fastener hole and described holds out against component one (4), it holds out against axial direction of the component one for along upper fastener hole and pushes against sample upper end outer wall, keep sample upper end and upper location hole another Two side walls are bonded and are formed tangent positional relationship and are locked, and the intersection of the two side walls is the axis with upper fastener hole The incline of heart line intersection；

The position that the lower lock block side wall corresponds to lower Positioning holes is provided with the lower fastener hole (22) from external perforation to lower Positioning holes, The axial line of the lower fastener hole intersects with an incline of lower Positioning holes, is provided in lower fastener hole and described holds out against component two (5), it holds out against axial direction of the component two for along lower fastener hole and pushes against sample lower end outer wall, make sample lower end and lower Positioning holes Two side walls are bonded and are formed tangent positional relationship and are locked, and the intersection of the two side walls is the axis with lower fastener hole The incline of heart line intersection；

The upper fastener hole is located at same parallel with the stretch rod axial direction of creep testing machine with the axial line of lower fastener hole In plane, pushes against with the end for holding out against component two and positioned respectively with upper and lower so that sample upper and lower ends are held out against component one respectively When hole is tangent, the sample top and bottom are also located just at same parallel with the stretch rod axial direction of creep testing machine put down In face, to realize the centering of sample, sample premature bending in creep compression test is prevented.

2. a kind of creep compression clamp according to claim 1, which is characterized in that the axial line of the upper fastener hole with it is upper One incline of location hole intersects vertically, and the axial line of lower fastener hole and an incline of lower Positioning holes intersect vertically.

3. a kind of creep compression clamp according to claim 1, which is characterized in that the upper fastener hole and lower fastener hole are equal For tapped threaded hole, described to hold out against component one and hold out against component two be to hold out against with externally threaded bolt or screw Component one with hold out against component two respectively in upper fastener hole and lower fastener hole towards the direction precession close to sample and respectively to sample It is fastened.

4. a kind of creep compression clamp according to claim 1, which is characterized in that the upper location hole and lower Positioning holes Depth is less than or equal to the length of the end of sample to be protruded into, and the depth of the upper location hole and lower Positioning holes is greater than or equal to The 1/2 of the tip lengths of sample to be protruded into, to guarantee the firmness of clamping, and will not influence sample up and down at lug with dress of extending The connection set.