CN210690229U - Creep compression clamp - Google Patents
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- CN210690229U CN210690229U CN201921608053.6U CN201921608053U CN210690229U CN 210690229 U CN210690229 U CN 210690229U CN 201921608053 U CN201921608053 U CN 201921608053U CN 210690229 U CN210690229 U CN 210690229U
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- 238000007906 compression Methods 0.000 title claims abstract description 52
- 230000006835 compression Effects 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 105
- 238000003825 pressing Methods 0.000 claims description 49
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000012669 compression test Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 6
- 230000035882 stress Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
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- 238000006073 displacement reaction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model provides a creep compression anchor clamps, including the commutator, the commutator includes briquetting and briquetting down, and the bottom surface of going up the briquetting and the top surface of briquetting down are provided with the upper and lower locating hole that supplies the terminal triangular prism form that stretches into of sample respectively, and the position of locating hole is provided with the upper and lower fastening hole that link up to upper and lower locating hole from the outside respectively about the briquetting lateral wall corresponds from the top to bottom, fastens the interior tight part in top that supports tight sample along the sample transverse direction that is equipped with of hole from top to bottom. The utility model discloses having optimized the sample in the installation with the depth of parallelism at compression fixture center, having ensured the centering nature of sample in compression process, the difference of deflection has improved experimental precision about reducing. The test stress range is expanded, and the repeatability, the integrity and the operation safety of test data are ensured. The test steps are simplified, the test time is saved, the use amount of the sample and the use times of the machine are greatly reduced, and the test device is more energy-saving and environment-friendly.
Description
Technical Field
The utility model relates to a creep test equipment, especially a creep compression anchor clamps.
Background
With the rapid development of the industry in China, the creep age forming technology is also continuously improved, the creep age forming technology is a main forming technology of large-scale wall plates such as airplanes and rockets, before actual creep age forming is carried out on materials such as aluminum alloys, creep age forming simulation is generally carried out by using finite element software, and the most appropriate actual forming scheme is determined by software simulation. Before the creep age forming simulation is performed on the material, the creep performance of the material is tested, a creep testing machine is commonly used, the material to be tested is processed into a test sample, the test sample is clamped between an upper stretching rod and a lower stretching rod of the creep testing machine, the creep stretching or compression test is performed on the test sample at a set creep age temperature to obtain the stretching or compression creep amount of the test sample, and then the creep curve of the material is obtained to be provided for a creep age forming simulation model and finally used for guiding actual creep age forming.
When the conventional creep testing machine performs a creep compression test on a sample, the conventional creep testing machine generally adopts a rod-shaped sample to perform the test, external threads are arranged at two ends of the rod-shaped sample, and the two ends of the rod-shaped sample are connected with a compression clamp in a direct or indirect threaded screwing manner, for example, the creep compression testing device disclosed in Chinese patent 201910244627.4 has the advantages that the upper end of the sample is in threaded connection with an upper pressing block, the lower end of the sample is in threaded connection with a conical positioner, and the conical positioner is positioned by a conical hole on a lower pressing block so as to enhance the centering property of the. Because the screw thread also can have the installation clearance when connecting soon, consequently, the sample still can have slight in the pressurized process and control the possibility of rocking, it is not good enough to neutrality, and the deflection has certain difference about the sample among the creep aging test process, influences the accuracy of test data, consequently needs a better scheme among the prior art, solves this problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a creep compression anchor clamps to solve the problem that proposes in the background art.
A creep compression clamp comprises a first jacking component, a second jacking component and a commutator connected between an upper connector and a lower connector of a creep testing machine, wherein the commutator comprises an upper pressing block and a lower pressing block, a distance for mounting a sample is kept between the upper pressing block and the lower pressing block along the tensile direction of the creep testing machine, the distance value can be adjusted, the creep compression clamp is used for providing creep compression loading operation for the sample when the distance is reduced, and the distance is used for dismounting the sample when the distance is increased;
the bottom surface of the upper pressing block is provided with a triangular prism-shaped upper positioning hole for the upper end of a sample to extend into, the top surface of the lower pressing block is provided with a triangular prism-shaped lower positioning hole for the lower end of the sample to extend into, the upper positioning hole and the lower positioning hole are aligned along the axial direction of a stretching rod of the creep testing machine and have the same position, contour and size, the inner surfaces of the upper positioning hole and the lower positioning hole are smooth surfaces, and the diameter of an inscribed cylinder of the upper positioning hole and the lower positioning hole is larger than that of the end part of the sample to be extended into;
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 is intersected with one side edge of the upper positioning hole, the upper fastening hole is internally provided with a first jacking component, the first jacking component is used for abutting 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 is attached to the other two side walls of the upper positioning hole to form a tangential position relation and is locked, and the intersection line of the two side walls is the side edge intersected with the axis of the upper fastening hole;
the side wall of the lower pressure block is provided with a lower fastening hole penetrating from the outside to the lower positioning hole, the shaft axis of the lower fastening hole is intersected with one side edge of the lower positioning hole, a second jacking part is arranged in the lower fastening hole and used for abutting 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 is attached to two side walls of the lower positioning hole to form a tangential position relation and is locked, and the intersection line of the two side walls is the side edge intersected with the shaft axis of the lower fastening hole;
the axial leads of the upper fastening hole and the lower fastening hole are located in the same plane parallel to the axial direction of a stretching rod of the creep testing machine, so that when the upper end and the lower end of the sample are respectively abutted by the tail ends of the first abutting part and the second abutting part and are respectively tangent to the upper positioning hole and the lower positioning hole, 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 stretching rod of the creep testing machine, the centering of the sample is realized, and the sample is prevented from being bent too early in the creep compression test.
Preferably, the axis of the upper fastening hole is vertically intersected with one side edge of the upper positioning hole, and the axis of the lower fastening hole is vertically intersected with one side edge of the lower positioning hole.
Furthermore, the upper fastening hole and the lower fastening hole are threaded holes with internal threads, the first jacking component and the second jacking component are bolts or screws with external threads, and the first jacking component and the second jacking component are screwed in the upper fastening hole and the lower fastening hole towards the direction close to the sample respectively to fasten the sample respectively.
Preferably, the depths of the upper positioning hole and the lower positioning hole are less than or equal to the length of the end part to be extended into the sample, and the depths of the upper positioning hole and the lower positioning hole are greater than or equal to 1/2 of the length of the end part to be extended into the sample, so that the clamping firmness is ensured, and the connection between the upper lug and the lower lug of the sample and the extension device is not influenced.
The commutator further comprises an upper guide rod, a lower guide rod, an upper stretching rod and an upper connecting block which are positioned above the upper pressing block, a lower stretching rod and a lower connecting block which are positioned below the lower pressing block, wherein the upper end of the upper stretching rod is used for connecting an upper connector of a creep testing machine, the lower end of the upper stretching rod is fixedly connected with the upper connecting block, the lower end of the lower stretching rod is used for connecting a lower connector of the creep testing machine, the upper end of the lower stretching rod is fixedly connected with the lower connecting block, the upper guide rod sequentially penetrates through guide holes formed in the upper connecting block, the upper pressing plate and the lower pressing plate from top to bottom, the middle part of the upper guide rod penetrates through the guide hole formed in the upper pressing block, the upper end of the upper guide rod is provided with a shaft shoulder, the end of the upper guide rod is fixedly connected with the upper connecting block through a first nut, and the lower; the lower guide rod sequentially penetrates through guide holes formed in the lower connecting block, the lower pressing plate and the upper pressing plate from bottom to top, the middle part of the lower guide rod is arranged in the guide hole formed in the lower pressing block in a penetrating mode, the upper end of the lower guide rod is connected with a third nut after penetrating through the guide hole in the upper pressing block, and the lower end of the lower guide rod is provided with a shaft shoulder and is fixedly connected with the lower connecting block through the fourth nut. The upper pressing block and the lower pressing block can slide relative to the upper guide rod and the lower guide rod, and the distance between the upper pressing block and the lower pressing block for mounting the sample can be manually adjusted.
The utility model discloses following beneficial effect has at least:
the utility model discloses a change the clamping mode between compression anchor clamps and bar-shaped sample, solve in the compression creep test process because the installation clearance between sample and compression anchor clamps makes the sample relatively poor to neutrality, lead to the sample to control the deformation gap great, the poor problem of creep amount measurement accuracy, the utility model discloses small deformation when mainly being applied to measure unipolar compression creep ageing tests, the utility model discloses can solve following several problems:
1. the parallelism of the sample and the center of the compression clamp in the installation process is optimized, the centering performance of the sample in the compression process is ensured, the difference of left and right deformation is reduced, and the measurement precision of micro deformation can be obviously improved.
2. The problem that the aging time cannot meet the test requirement due to the fact that a test sample is easy to bend at a high stress level is solved, the test stress range is expanded, the integrity of test data is guaranteed, and a more comprehensive test result is provided for scientific research.
3. The possibility of instability and bending of the sample in the compression process is reduced, the stability of the sample is better, and the safety of a testing machine is well guaranteed. And the accuracy and repeatability of test measurement data are good, the phenomenon that repeated tests are needed when the conventional compression clamp is used is avoided, the test steps are simplified, the test time is saved, the use amount of samples and the use times of machines are greatly reduced, and the device is more energy-saving and environment-friendly.
Use the utility model discloses a creep compression anchor clamps when experimental, can change the external screw thread structure at current bar-like sample both ends into glossy cylindric structure for in stretching into about the locating hole, area of contact between multiplicable sample and the locating hole on the one hand, the clamping firmness of reinforcing sample, the step of the required experience of on the other hand reducible sample processing to the finished product is saved manual work and cost.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a view of the overall installation structure of a creep compression jig according to a preferred embodiment of the present invention;
FIG. 2 is an enlarged detail view of a preferred embodiment of the present invention at the creep compression clamp specimen clamping position;
FIG. 3 is a cross-sectional view of the inside of a creep compression clamp in accordance with a preferred embodiment of the present invention at a specimen clamping position;
FIG. 4 is a graph of deformation over time for a first set of first compressive creep tests performed with a prior art compression jig;
FIG. 5 is a graph of the amount of deformation over time obtained from a first set of second compressive creep tests performed with a conventional compression jig;
FIG. 6 is a graph showing the amount of deformation over time obtained from a second set of compressive creep tests conducted with the creep compression jig according to the preferred embodiment of the present invention;
fig. 7 is a graph showing the amount of deformation with time obtained by the third group of compressive creep tests performed by the creep compression jig according to 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-first nut, 17-third nut, 2-lower pressing block, 21-lower positioning hole, 22-lower fastening hole, 23-lower guide rod, 24-lower stretching rod, 25-lower connecting block, 26-second nut, 27-fourth nut, 3-sample, 4-first tightening part and 5-second tightening part.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1 to 3, the creep compression clamp includes a first tightening member 4, a second tightening member 5, and a commutator for connecting between upper and lower connectors (i.e., the upper connector and the lower connector, not shown in the drawings) of a creep testing machine, where the commutator includes an upper press block 1 and a lower press block 2, a distance for mounting a sample 3 is maintained between the upper press block and the lower press block along a tensile direction of the creep testing machine, and the distance value can be adjusted under the driving of the creep testing machine, the distance can be decreased for providing a creep compression loading operation to the sample, and the distance can be increased for dismounting 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 a sample to extend into, 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, the upper positioning hole and the lower positioning hole are aligned along the axial direction of a stretching rod of the creep testing machine and have the same position, contour and size, the inner surfaces of the upper positioning hole and the lower positioning hole are smooth, and the diameter of inscribed circles of the upper positioning hole and the lower positioning hole is larger than the diameter of the end part of; in this embodiment, the cross sections of the upper positioning hole and the lower positioning hole are both regular triangles.
An upper fastening hole 12 penetrating from the outside to the upper positioning hole is formed in the position, corresponding to the upper positioning hole, of the side wall of the upper pressing block, the axis of the upper fastening hole is intersected with one side edge of the upper positioning hole, a first jacking component 4 is arranged in the upper fastening hole, the tail end of the first jacking component abuts against the outer wall of the upper end of the rod-shaped sample along the axial direction of the upper fastening hole, the upper threaded end of the rod-shaped sample is attached to the other two side walls of the upper positioning hole to form a tangential position relation, and the intersection line of the two side walls is the side edge intersected with the axis of the upper fastening hole;
a lower fastening hole 22 penetrating from the outside to the lower positioning hole is formed in the position, corresponding to the lower positioning hole, of the side wall of the lower pressing block, the shaft axis of the lower fastening hole is intersected with one side edge of the lower positioning hole, a second jacking part 5 is arranged in the lower fastening hole, the tail end of the second jacking part abuts against the outer wall of the lower end of the rod-shaped sample along the axial direction of the lower fastening hole, the lower threaded end of the rod-shaped sample is attached to two side walls of the lower positioning hole to form a tangential position relation, and the intersection line of the two side walls is the side edge intersected with the shaft axis of the lower fastening hole;
in this embodiment, the axial leads of the upper fastening hole and the lower fastening hole are arranged along the horizontal direction and are located in the same plane parallel to the axial direction of the stretching rod of the creep testing machine, so that when the upper end and the lower end of the sample are respectively abutted by the first abutting part and the second abutting part and are respectively tangent to the upper positioning hole and the lower positioning hole, 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 stretching rod of the creep testing machine, thereby realizing the centering of the sample and preventing the sample from being bent too early in the creep compression test.
In this embodiment, the axis of the upper fastening hole perpendicularly intersects with one prismatic surface of the upper positioning hole, the side edge opposite to the prismatic surface also perpendicularly intersects with the axis of the upper fastening hole, the axis of the lower fastening hole perpendicularly intersects with one prismatic surface of the lower positioning hole, and the side edge opposite to the prismatic surface also perpendicularly intersects with the axis 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 of the end part of the sample to be inserted, so as to ensure the clamping firmness, and the connection between the upper lug and the lower lug of the sample and the extension device is not affected.
In this embodiment, the commutator further includes an upper guide rod 13, a lower guide rod 23, an upper stretching rod 14 and an upper connecting block 15 which are located above the upper pressing block, a lower stretching rod 24 and a lower connecting block 25 which are located below the lower pressing block, the upper end of the upper stretching rod is used for connecting an upper connector of a creep testing machine, the lower end of the upper stretching rod is fixedly connected with the upper connecting block, the lower end of the lower stretching rod is used for connecting a lower connector of the creep testing machine, the upper end of the lower stretching rod is fixedly connected with the lower connecting block, the upper guide rod sequentially penetrates through guide holes formed in the upper connecting block, the upper pressing plate and the lower pressing plate from top to bottom, the middle part of the upper guide rod penetrates through the guide hole formed in the upper pressing block, the upper end of the upper guide rod is provided with a shaft shoulder, the end of the upper guide rod is fixedly connected with the upper connecting block through a first nut 16. The lower guide rod sequentially penetrates through guide holes formed in the lower connecting block, the lower pressing plate and the upper pressing plate from bottom to top, the middle part of the lower guide rod penetrates through the guide holes formed in the lower pressing block, the upper end of the lower guide rod is connected with a third nut 17 after penetrating through the guide holes in the upper pressing block, and the lower end of the lower guide rod is provided with a shaft shoulder and is fixedly connected with the lower connecting block through a fourth nut 27. The upper pressing block and the lower pressing block can slide relative to the upper guide rod and the lower guide rod, 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, the first tightening member and the second tightening member both use bolts with hexagonal holes.
When a sample is clamped, the upper end and the lower end of the sample are respectively placed into the upper locating hole and the lower locating hole which are in the triangular prism shape, after the upper end face and the lower end face of the sample are completely contacted with the inner bottom faces of the upper locating hole and the lower locating hole, the inner hexagonal bolts used for locking in the upper fastening hole and the lower fastening hole are screwed, the two ends of the sample are locked in the locating holes of the triangular prism by using a jacking type radial stress locking method, and at the moment, the connection of the sample and the commutator is completed.
In the test process, a driving system of the creep testing machine transmits force to the upper and lower movable pull rods, so that the upper and lower pull rods move upwards and downwards respectively, the compressive stress state required by the sample is realized through the commutator, and the commutator converts the tensile stress of the creep testing machine into the compressive stress of the sample.
After the sample is fixed, an upper extension rod group and a lower extension rod group are installed on the sample, a displacement sensor is connected below the extension rods, deformation data of the sample are measured in real time, a thermocouple is fixed on the surface of the middle of the sample, and the temperature of the sample is guaranteed to be basically consistent with the temperature in the creep machine furnace set by the test. And setting specific test parameters, test steps and data sampling frequency of each step on a computer for controlling the creep machine.
After the test is finished, detailed creep variable data including left deformation, right deformation, average deformation and relative elongation can be obtained from a PC display screen of the creep testing machine. The contact ratio of the left deformation and the right deformation along with the time change curve is an important reference for judging the deformation uniformity of the sample and whether the sample is bent, if the left deformation and the right deformation are basically consistent, the deformation of the sample is relatively uniform and basically not bent, and the creep data at the moment is high in accuracy and can be used for subsequent scientific analysis.
In order to verify the utility model discloses a creep compression anchor clamps is at the sample to the beneficial effect in the aspect of neutrality and stability, the utility model discloses use the SUST-D5 creep testing machine of the production of zhhai san Si taijie electrical equipment Limited company to be test equipment, and creep testing machine force control error precision is 3N, and supporting auxiliary heating stove temperature control precision is 2 ℃. The overall creep measurement system comprises: the upper extension rod group, the lower extension rod group and a displacement sensor outside the furnace. In the creep aging process, the creep amount of the sample is transmitted to a 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. Wherein the displacement sensor is a grating linear displacement sensor with the precision of 5 multiplied by 10-4mm。
Carry out unipolar constant stress compression creep age comparative test with above-mentioned creep testing machine, the experiment divide into three groups, and the sample that three groups of experiments used is the 2219 aluminum alloy creep sample that the state is the same completely, and the sample both ends that three groups of experiments used all have the external screw thread, wherein:
the first group uses the existing compression clamp (the selected existing compression clamp has the same structure as that disclosed in the Chinese patent 201910244627.4) to perform the compression creep test on the sample for three times under the completely same test conditions: the test temperature is 165 ℃, the heating rate is 5 ℃/min, the aging time is 9h, and the stress is 120 MPa;
the second group is used for carrying out three times of the same compression creep tests on the sample by the creep compression clamp, and the test conditions are the same as the first group;
third group with the utility model discloses a creep compression anchor clamps carry out twice identical compressive creep test to the sample, except that the stress size is 180MPa, all the other test conditions are the same with the second group.
The creep amounts of the first three tests are respectively 0.27% for the first time (see the graph of fig. 4), 0.215% for the second time (see the graph of fig. 5), and 0.259% for the third time, and the left and right deformation differences of the first, second and third tests are respectively 0.022mm, 0.029mm and 0.018mm (the left and right differences are about 21%, 32% and 18%), but the left and right deformation differences are still large. Therefore, when the conventional compression clamp is used for creep test, the test repeatability is poor, the accuracy of test data is not high, great difficulty is caused in analysis of the test data, and a more accurate test result can be determined after repeated tests are carried out;
the left and right deformation differences of the second group of three tests are between 0.011 mm and 0.014mm (the difference between the left and right is 13 percent to 17 percent), and the change curves of the strain quantities of the three tests along with time can be basically represented by a curve chart of figure 6;
the left and right deformation difference of the third group of two tests is between 0.013-0.016mm (the difference between the left and right is 11% -15%), and the change curves of the strain quantities of the two tests along with the time can be basically represented by a curve chart of fig. 7.
Can know from above data to use the second group and the third group experiment as the representative the utility model discloses a creep deformation compression anchor clamps compare with current compression anchor clamps and obviously reduce, and the experimental data repeatability is high, generally carries out twice the same experiment and can confirm comparatively accurate test data.
In addition, in the three groups of test processes, the inventor finds that the existing compression clamp still slightly shakes after the test sample is installed because the test sample is in clearance connection with the commutator in the test sample installation process, the creep deformation amount of the creep aging test is small, the measurement is very precise, and even slight shaking has great influence on the left and right deformation of the test sample in the creep aging process, so that a tester needs to ensure the accuracy of data as much as possible by means of visual inspection of the parallelism of the test sample and the compression clamp, but the method has high operation requirements on the tester and great uncertainty of the test result. Therefore, the creep data measured by the conventional compression clamp has low accuracy, and only a rough data range and a test rule can be obtained.
And after the improvement the utility model discloses a compression clamp subassembly no longer needs the experimenter to rely on the range estimation at the in-process of installation sample, installation easy operation, and with the experimental data degree of accuracy height, can be accurate to concrete numerical value basically, avoid experimental repetitive operation, greatly shortened test time to enlarge experimental stress range, provide reliable guarantee for the researcher carries out data analysis and the theoretical research of high accuracy. Meanwhile, the using amount of the sample is greatly reduced, the using amount and the processing cost of materials are effectively saved, and the concept of energy conservation and environmental protection is met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The creep compression clamp is characterized by comprising a first jacking component (4), a second jacking component (5) and a commutator connected between an upper connector and a lower connector of a creep testing machine, wherein the commutator comprises an upper pressing block (1) and a lower pressing block (2), a distance for mounting a test sample (3) is kept between the upper pressing block and the lower pressing block along the tensile direction of the creep testing machine, the distance value can be adjusted, the creep compression clamp is used for providing creep compression loading operation for the test sample when the distance becomes smaller, and the test sample is dismounted when the distance becomes larger;
the bottom surface of the upper pressing block is provided with a triangular prism-shaped upper positioning hole (11) for the upper end of a sample to extend into, 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, the upper positioning hole and the lower positioning hole are aligned along the axial direction of a stretching rod of the creep testing machine and have the same position, contour and size, the inner surfaces of the upper positioning hole and the lower positioning hole are smooth surfaces, and the diameter of an inscribed cylinder of the upper positioning hole and the lower positioning hole is larger than that of the end part of the sample to be extended into;
an upper fastening hole (12) penetrating from the outside to the upper positioning hole is formed in the position, corresponding to the upper positioning hole, of the side wall of the upper pressing block, the axis of the upper fastening hole is intersected with one side edge of the upper positioning hole, a first jacking component (4) is arranged in the upper fastening hole, the first jacking component is used for abutting against the outer wall of the upper end of the sample along the axial direction of the upper fastening hole, the upper end of the sample is attached to the other two side walls of the upper positioning hole to form a tangential position relation and is locked, and the intersection line of the two side walls is the side edge of the upper positioning hole, which is intersected with the axis of the upper fastening hole;
a lower fastening hole (22) penetrating from the outside to the lower positioning hole is formed in the position, corresponding to the lower positioning hole, of the side wall of the lower pressing block, the shaft axis of the lower fastening hole is intersected with one side edge of the lower positioning hole, a second jacking part (5) is arranged in the lower fastening hole, the second jacking part is used for abutting against the outer wall of the lower end of the sample along the axial direction of the lower fastening hole, the lower end of the sample is attached to two side walls of the lower positioning hole to form a tangential position relation and is locked, and the intersection line of the two side walls is the side edge, intersected with the shaft axis of the lower fastening hole, of the lower positioning;
the axial leads of the upper fastening hole and the lower fastening hole are located in the same plane parallel to the axial direction of a stretching rod of the creep testing machine, so that when the upper end and the lower end of the sample are respectively abutted by the tail ends of the first abutting part and the second abutting part and are respectively tangent to the upper positioning hole and the lower positioning hole, 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 stretching rod of the creep testing machine, the centering of the sample is realized, and the sample is prevented from being bent too early in the creep compression test.
2. The creep compression jig of claim 1 wherein the axis of the upper fastening hole perpendicularly intersects one of the side edges of the upper positioning hole and the axis of the lower fastening hole perpendicularly intersects one of the side edges of the lower positioning hole.
3. The creep compression jig of claim 1, wherein the upper fastening hole and the lower fastening hole are threaded holes with internal threads, the first tightening member and the second tightening member are bolts or screws with external threads, and the first tightening member and the second tightening member are screwed into the upper fastening hole and the lower fastening hole respectively in a direction close to the test sample to fasten the test sample.
4. The creep compression jig of claim 1 wherein the depth of the upper locating hole and the lower locating hole is less than or equal to the length of the end portion to be inserted into the test sample, and the depth of the upper locating hole and the lower locating hole is greater than or equal to 1/2 of the length of the end portion to be inserted into the test sample, so as to ensure the firmness of clamping without affecting the connection between the upper lug and the lower lug of the test sample and the extension device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921608053.6U CN210690229U (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921608053.6U CN210690229U (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210690229U true CN210690229U (en) | 2020-06-05 |
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| CN201921608053.6U Withdrawn - After Issue CN210690229U (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501217A (en) * | 2019-09-25 | 2019-11-26 | 中南大学 | A kind of creep compression clamp |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501217A (en) * | 2019-09-25 | 2019-11-26 | 中南大学 | A kind of creep compression clamp |
| CN110501217B (en) * | 2019-09-25 | 2024-03-08 | 中南大学 | Creep compression clamp |
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