CN211740927U - Clamp for three-point bending test of small sample - Google Patents
Clamp for three-point bending test of small sample Download PDFInfo
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- CN211740927U CN211740927U CN201921821278.XU CN201921821278U CN211740927U CN 211740927 U CN211740927 U CN 211740927U CN 201921821278 U CN201921821278 U CN 201921821278U CN 211740927 U CN211740927 U CN 211740927U
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 238000013001 point bending Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000003079 width control Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of fusion reaction testing, in particular to a clamp for three-point bending test of small samples, which comprises an upper fixed connecting block and a lower fixed connecting block which are coaxially arranged and are respectively positioned at the upper end and the lower end of the clamp, wherein a punch connecting block and a fixed base are coaxially arranged between the upper fixed connecting block and the lower fixed connecting block, and a guide column is arranged through the punch connecting block and the fixed base; the center of the punch connecting block is coaxially and fixedly provided with a punch; the clamp has the advantages of simple structure, convenient operation and high stability, can basically eliminate the interference of friction force by reasonable clearance fit, and is suitable for three-point bending test of small samples with various sizes.
Description
Technical Field
The utility model belongs to the technical field of the fusion reaction test, concretely relates to small sample three point bending test is with anchor clamps.
Background
The thickness of the first wall of the fusion reactor cladding structure and the thickness of the cooling pipeline are only several millimeters, and when the mechanical property of the cladding structure material is tested, a standard large sample cannot be used, and the size of the test sample needs to be reduced; in the neutron irradiation experiment of the cladding structure material, since the size of the neutron irradiation container is limited (for example, the irradiation volume of a high-throughput testing module (HFTM) of the international fusion reactor material irradiation facility (IFMIF) is only 0.5L, but thousands of samples need to be accommodated), and the neutron irradiation container is limited by the uniformity of flux and temperature distribution in the irradiation process, small samples are also required to be used for testing the irradiation resistance. In addition, the small sample is beneficial to reducing radioactivity and harm of experiment to human body and environment after neutron irradiation. Thus, small sample testing techniques are crucial to the study of fusion reactor materials.
The size of the small sample required by the mechanical property test of the fusion reactor material is millimeter level, the precision requirement on mechanical test equipment and a clamp is higher, and general equipment and the clamp for the mechanical property test of the conventional material can not meet the requirement on the measurement of the small sample, so that a special high-precision small sample mechanical testing machine is required and a novel special clamp device for the small sample test is provided. The invention relates to a clamp device for a three-point bending test, which is used for testing the mechanical properties of small samples in various types; besides the fusion reactor material, the material is also suitable for other non-fusion material fields needing to be related to the mechanical property test of small samples.
Disclosure of Invention
The utility model aims at providing a small sample three point bending test is with anchor clamps can be applicable to millimeter level small sample three point bending capability test.
The technical scheme of the utility model as follows:
a clamp for three-point bending test of a small sample comprises an upper fixed connecting block and a lower fixed connecting block which are coaxially arranged and are respectively positioned at the upper end and the lower end of the clamp, wherein a punch connecting block and a fixed base are coaxially arranged between the upper fixed connecting block and the lower fixed connecting block, and a guide column is arranged through the punch connecting block and the fixed base; the center of the punch connecting block is coaxially and fixedly provided with a punch;
the guide columns are divided into a plurality of inner guide columns and outer guide columns which are arranged in parallel in the vertical direction; the distance between the inner guide post and the central axis of the clamp is less than the distance between the outer guide post and the central axis of the clamp;
the outer guide post penetrates through a guide post mounting hole in the punch connecting block, the upper end of the outer guide post is fixedly connected with the upper fixed connecting block, and the lower end of the outer guide post is fixedly connected with the fixed base; the inner guide column penetrates through a guide column mounting hole in the fixed base, the upper end of the inner guide column is fixedly connected with the punch connecting block, and the lower end of the inner guide column is fixedly connected with the lower fixed connecting block;
the fixed base on be fixed and be equipped with I-shaped linear guide, I-shaped linear guide on place sample supporting block structure, sample supporting block structure can slide along I-shaped linear guide.
The structure of the sample supporting block is that a sample supporting block a and a sample supporting block b are arranged on an I-shaped linear guide rail in a front-back manner; the front end and the rear end of the I-shaped linear guide rail are respectively fixedly provided with a check block a and a check block b, the check block a is connected with the bottom of the sample supporting block a through a screw rod in the horizontal direction, and the check block b is connected with the bottom of the sample supporting block b through a screw rod in the horizontal direction.
The front side of the sample supporting block a is connected with a length adjusting block a through a stud thread, and the rear side of the sample supporting block b is connected with a length adjusting block b through a stud thread.
The sample supporting block structure on be equipped with along width direction and be equipped with two width control pieces, process the sliding tray on every width control piece, be equipped with the pin in the sliding tray, on the installation face of sample supporting block structure, through the cooperation of pin and sliding tray, realize the position removal of each width control piece.
The outer guide post is divided into a left outer guide post and a right outer guide post, and the inner guide post is divided into a left inner guide post and a right inner guide post; last fixed connection piece and be equipped with two guide post mounting holes on the fixed connection piece down respectively, just the distance R1 of two guide post mounting holes on the mounting panel of last fixed connection piece be greater than the distance R2 of two guide post mounting holes on the mounting panel of fixed connection piece down.
Two ends of the punch connecting block are respectively provided with two guide post mounting holes, the distance between two holes on the inner side is R2, and the distance between two holes on the outer side is R1; two guide post mounting holes are respectively machined at two ends of the fixed base, the distance between two holes at the inner side is R2, and the distance between two holes at the outer side is R1; the left inner guide column and the right inner guide column respectively penetrate through two guide column mounting holes in the inner side of the fixed base, the upper ends of the left inner guide column and the right inner guide column are respectively fixed in the two guide column mounting holes in the inner side of the punch connecting block, and the lower ends of the left inner guide column and the right inner guide column are respectively fixed in the two guide column mounting holes of the lower fixed connecting block; the left outer guide post and the right outer guide post respectively penetrate through two guide post mounting holes in the outer side of the punch connecting block, the upper ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes of the upper fixed connecting block, and the lower ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes in the outer side of the fixed base.
The upper end and the lower end of the guide post are connected with the upper fixed connecting block, the punch connecting block, the fixed base or the lower fixed connecting block through the positioning pins during fixed connection.
The upper fixed connecting block and the lower fixed connecting block have the same structure and are composed of a fixed plate and a mounting plate connected with the fixed plate, the fixed plate is provided with a mounting hole used for being connected with test equipment, and the mounting plate is provided with a mounting hole used for mounting a guide column.
The number of the outer guide posts or the inner guide posts of the guide posts is 2, 3 or 4, and the guide posts are uniformly arranged in the radial direction of the clamp.
The utility model has the advantages as follows:
the mechanical structure design converts the tensile force of the high-precision small sample tensile testing machine into the pressure of the punch on the small sample, and the purpose of testing the three-point bending performance of the small sample is achieved by utilizing the interaction of the sample, the punch and the supporting block. The clamp device is suitable for a small sample tensile testing machine with the load range less than or equal to 2 kN.
The clamp has the advantages of simple structure, convenient operation and high stability, can basically eliminate the interference of friction force by reasonable clearance fit, and is suitable for three-point bending test of small samples with various sizes. The clamp is loaded in a high-precision small sample tensile testing machine, and can quickly and accurately measure the three-point bending strength of a small sample.
The structural design of guide post about holistic guarantees that pressure acts on the sample that awaits measuring all the time perpendicularly in the testing process, and sample width regulating block and sample length regulating block are spacing fixed the sample that awaits measuring in best test position for the operating stability of this anchor clamps test improves, and measurement accuracy also promotes to some extent.
Drawings
FIG. 1 is a schematic view of a clamp for three-point bending test of a small sample;
FIG. 2 is a front view of a clamp for three-point bending test of a small sample;
FIG. 3 is a left side view of a clamp for three-point bending test of a small sample;
FIG. 4 is a top view of a clamp for three-point bending test of a small sample;
FIG. 5 is a schematic view of a three-point bend test specimen;
in the figure: 1. an upper fixed connecting block; 2. a punch connecting block; 3. a punch; 4. a guide post; 5. a sample width adjusting block; 6. a sample length adjusting block; 7. a sample supporting block a; 8. a sample supporting block b; 9. a sample length adjusting stud; 10. a linear guide rail; 11. a block a; 12. a block b; 13. the sample supporting block supports the screw; 14. a fixed base; 15. a lower fixed connecting block;
4-1, left outer guide post; 4-2, left inner guide post; 4-3. right outer guide post; 4-4. right inner guide post;
5-1. width adjusting block a; 5-2. width adjusting block b; 5-3. width adjusting block c; 5-4. width adjusting block d;
6-1, a length adjusting block a; 6-2. length adjusting block b;
9-1. length adjusting stud a; 9-2. length adjusting stud b; 9-3. length adjusting stud c; 9-4, adjusting the stud d in length;
13-1, supporting a screw a by a sample supporting block; 13-2, supporting a screw b by a sample supporting block; 13-3, supporting a screw rod c by a sample supporting block; 13-4, supporting a screw rod d by a sample supporting block;
Detailed Description
The guide post 4 is divided into a left outer guide post 4-1, a left inner guide post 4-2, a right outer guide post 4-3 and a right inner guide post 4-4, the sample width adjusting block 5 is divided into a width adjusting block a5-1, a width adjusting block b5-2, a width adjusting block c5-3 and a width adjusting block d5-4, the sample length adjusting block 6 is divided into a length adjusting block a6-1 and a length adjusting block b6-2, the sample length adjusting stud 9 is divided into a length adjusting stud a9-1, a length adjusting stud b9-2, a length adjusting stud c9-3 and a length adjusting stud d9-4, sample support block support screw 13 is divided into sample support block support screw a13-1, sample support block support screw b13-2, sample support block support screw c13-3, and sample support block support screw d 13-4.
As shown in fig. 1 to 4, the upper fixed connection block 1 and the lower fixed connection block 15 have the same structure and are coaxially mounted, and each fixed connection block is composed of a fixed plate and a mounting plate connected with the fixed plate, a mounting hole used for being connected with a test device is processed on the fixed plate, two mounting holes used for mounting guide posts are processed on the mounting plate, wherein the distance R1 between the two guide post mounting holes on the mounting plate of the upper fixed connection block 1 is greater than the distance R2 between the two guide post mounting holes on the mounting plate of the lower fixed connection block 15.
As shown in fig. 2, a punch connecting block 2 and a fixing base 14 are coaxially installed between an upper fixing connecting block 1 and a lower fixing connecting block 15, and a guide post 4 is installed through the punch connecting block 2 and the fixing base 14. Wherein two guide post mounting holes are processed respectively at the both ends of drift connecting block 2, and the distance is R2 between two holes of inboard, and the distance is R1 between two holes of outside, and the coaxial fixed mounting drift 3 in drift connecting block 2 center. Two guide post mounting holes are respectively machined at two ends of the fixed base 14, the distance between two holes on the inner side is R2, and the distance between two holes on the outer side is R1. The left inner guide post 4-2 and the right inner guide post 4-4 respectively penetrate through two guide post mounting holes on the inner side of the fixed base 14, the upper ends of the left inner guide post and the right inner guide post are respectively fixed in the two guide post mounting holes on the inner side of the punch connecting block 2, and the lower ends of the left inner guide post and the right inner guide post are respectively fixed in the two guide post mounting holes of the lower fixed connecting block 15. The left outer guide post 4-1 and the right outer guide post 4-3 respectively penetrate through two guide post mounting holes on the outer side of the punch connecting block 2, the upper ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes of the upper fixed connecting block 1, and the lower ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes on the outer side of the fixed base 14.
Each guide post 4 is connected with the upper fixed connecting block 1, the punch connecting block 2, the fixed base 14 and the lower fixed connecting block 15 by using a positioning pin.
As shown in fig. 1, 3 and 4, in the front-rear direction, the i-shaped linear guide 10 is fixed to the fixed base 14 by bolts and positioning pins, and the stopper a11 and the stopper b12 are fixed to the front and rear ends of the i-shaped linear guide 10 by bolts, respectively.
The I-shaped linear guide rail 10 is provided with a sample support block a7 and a sample support block b8 in a front-back manner, and the sample support block a7 and the sample support block b8 can freely slide on the I-shaped linear guide rail 10 and can be fixed in position by a conventional mode such as a lock nut.
Sample support block a7 is supported by connecting block a11 to the bottom of sample support block a7 at both ends by sample support block support screw a13-1 and sample support block support screw b 13-2. Sample support block support screw a13-1 and sample support block support screw b13-2 are threadably connected to both block a11 and sample support block a7 as described above, so that the relative positions of block a11 and sample support block a7 are adjustable.
Sample support block b8 is supported by sample support block support screw c13-1 and sample support block support screw 13-4 connecting stop b12 to the bottom of sample support block b8 at both ends. Sample support block support screw c13-1 and sample support block support screw d13-4 are threadedly connected to both block b12 and sample support block b8 as described above, so that the relative positions of block b12 and sample support block b8 are adjustable.
Length adjustment:
the front side of the front sample support block a7 is in threaded connection with a length adjustment block a6-1 through a length adjustment stud a9-1 and a length adjustment stud b9-2, and the rear side of the rear sample support block b8 is in threaded connection with a length adjustment block b6-2 through a length adjustment stud c9-3 and a length adjustment stud d 9-4. The relative positions of length adjustment block a6-1 and sample support block a7, and length adjustment block b6-2 and sample support block b8 are adjusted by threaded engagement to accommodate the length of the three-point bend sample.
Width adjustment:
width adjustment block a5-1 and width adjustment block b5-2 are mounted on sample support block a7, and width adjustment block c5-3 and width adjustment block d5-4 are mounted on sample support block b 8. All the width adjusting blocks 5 are provided with oblong sliding grooves, pins are arranged in the sliding grooves and on the upper surfaces of the sample supporting blocks a7 or b8, and the position movement of each width adjusting block 5 is realized through the matching of the pins and the sliding grooves, so that the width of the three-point bending sample on the sample supporting block 7 and the sample supporting block b8 is adapted, and the most appropriate position on the sample supporting block is adjusted.
The tolerance fit of the guide post 4 with the guide holes on the punch connecting block 2 and the fixing base 14 is preferably, but not limited to, a base hole system
The clearance fit of (2) can basically eliminate the interference of friction force on the basis of ensuring the guide function.
The sample width adjusting block 5 can adjust test samples with different widths, and the test sample width adjusting block is suitable for test samples with various sizes, and the size range of the cross section of the test sample is 1.5-10 mm multiplied by 1.5-10 mm; the sample supporting block can freely slide on the I-shaped linear guide rail to adjust the span, the maximum span range is 20mm, and millimeter-scale scales are engraved on the I-shaped linear guide rail, so that the test span can be read quickly; the sample length adjusting stud 9 is used for adjusting the sample length adjusting block 6, so that the purpose that the special fixture device for the three-point bending test of the small sample can be suitable for samples with different widths and lengths is achieved, and the universality of the special fixture device for the three-point bending test of the small sample is improved.
The upper fixed connecting block 1 and the lower fixed connecting block 15 are used for connecting a mechanical testing machine; the upper testing machine fixed connecting block 1 and the lower fixed connecting block 15 also have the function of fixedly connecting the guide post 4; the punch connecting block 2 is used for connecting the punch 3, guiding and fixing the left inner guide column 4-1 and the right inner guide column 4-4; millimeter-scale scales are engraved on the sample supporting block a7 and the sample supporting block b8, the sample supporting block a7 and the sample supporting block b8 can freely slide on the I-shaped linear guide rail 10 by utilizing structural design and have the function of locking and fixing positions, a sample width adjusting block 5 and a sample length adjusting block 6 are respectively arranged above the sample supporting block a7 and the sample supporting block b8, the linear guide rail 10 is fixed on a fixed base 14 through bolts and positioning pins, and meanwhile, the fixed base 14 plays a role in fixing a left outer guide post 4-1 and a right outer guide post 4-3 and guiding. The test device comprises a stopper a11 and a stopper b12, wherein the stopper a 8932 and the stopper b12 are fixed at two ends of a linear guide rail 10 through bolts, threaded holes are respectively punched at two ends of the stopper a11 and the stopper b12, a sample supporting block a7 and a sample supporting block b8 which are likely to slide in a stress process are supported by a sample supporting block supporting screw 13, in a mechanical experiment process, a small sample is placed on a sample supporting block a7 and a sample supporting block b8, a sample width adjusting block 5 and a sample length adjusting block 6, so that the center of the sample is placed at a punch 3, the sample and the punch 3, the sample supporting block a7 and the sample supporting block b8 are bent at three points, a pulling force is converted into a downward pressure between the punch and the sample by mechanical design, and the sample forms three-.
The present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and various modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a small sample three point bending test is with anchor clamps, includes last fixed connection piece (1) and lower fixed connection piece (15) that are located the coaxial arrangement of anchor clamps upper end and lower extreme respectively, its characterized in that: a punch connecting block (2) and a fixed base (14) are coaxially arranged between the upper fixed connecting block (1) and the lower fixed connecting block (15), and a guide column (4) is installed through the punch connecting block (2) and the fixed base (14); the center of the punch connecting block (2) is coaxially and fixedly provided with a punch (3);
the guide columns (4) are divided into a plurality of inner guide columns and outer guide columns which are arranged in parallel in the vertical direction; the distance between the inner guide post and the central axis of the clamp is less than the distance between the outer guide post and the central axis of the clamp;
the outer guide post penetrates through a guide post mounting hole in the punch connecting block (2), the upper end of the outer guide post is fixedly connected with the upper fixed connecting block (1), and the lower end of the outer guide post is fixedly connected with the fixed base (14); the inner guide column penetrates through a guide column mounting hole in the fixed base (14), the upper end of the inner guide column is fixedly connected with the punch connecting block (2), and the lower end of the inner guide column is fixedly connected with the lower fixed connecting block (15);
the test sample testing device is characterized in that an I-shaped linear guide rail (10) is fixedly arranged on the fixed base (14), a test sample supporting block structure is arranged on the I-shaped linear guide rail (10), and the test sample supporting block structure can slide along the I-shaped linear guide rail (10).
2. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the structure of the sample supporting block is that a sample supporting block a (7) and a sample supporting block b (8) are arranged on an I-shaped linear guide rail (10) in a front-back manner; the front end and the rear end of the I-shaped linear guide rail (10) are respectively fixedly provided with a check block a (11) and a check block b (12), the check block a (11) is connected with the bottom of the sample supporting block a (7) through a horizontal screw rod, and the check block b (12) is connected with the bottom of the sample supporting block b (8) through a horizontal screw rod.
3. The clamp for the three-point bending test of the small sample according to claim 2, wherein: the front side of the sample supporting block a (7) is connected with a length adjusting block a (6-1) through a stud thread, and the rear side of the sample supporting block b (8) is connected with a length adjusting block b (6-2) through a stud thread.
4. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the sample supporting block structure on be equipped with along width direction and be equipped with two width control pieces, process the sliding tray on every width control piece, be equipped with the pin in the sliding tray, on the installation face of sample supporting block structure, through the cooperation of pin and sliding tray, realize the position removal of each width control piece.
5. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the outer guide column is divided into a left outer guide column (4-1) and a right outer guide column (4-3), and the inner guide column is divided into a left inner guide column (4-2) and a right inner guide column (4-4); go up fixed connection piece (1) and be equipped with two guide post mounting holes on fixed connection piece (15) down respectively, just the distance R1 of two guide post mounting holes on the mounting panel of last fixed connection piece (1) be greater than the distance R2 of two guide post mounting holes on the mounting panel of fixed connection piece (15) down.
6. The clamp for the three-point bending test of the small sample according to claim 5, wherein: two ends of the punch connecting block (2) are respectively provided with two guide post mounting holes, the distance between two holes on the inner side is R2, and the distance between two holes on the outer side is R1; two guide post mounting holes are respectively machined at two ends of the fixed base (14), the distance between two holes at the inner side is R2, and the distance between two holes at the outer side is R1; the left inner guide column (4-2) and the right inner guide column (4-4) respectively penetrate through two guide column mounting holes in the inner side of the fixed base (14), the upper ends of the left inner guide column and the right inner guide column are respectively fixed in two guide column mounting holes in the inner side of the punch connecting block (2), and the lower ends of the left inner guide column and the right inner guide column are respectively fixed in two guide column mounting holes of the lower fixed connecting block (15); the left outer guide post (4-1) and the right outer guide post (4-3) respectively penetrate through two guide post mounting holes on the outer side of the punch connecting block (2), the upper ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes of the upper fixed connecting block (1), and the lower ends of the left outer guide post and the right outer guide post are respectively fixed in the two guide post mounting holes on the outer side of the fixed base (14).
7. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the upper end and the lower end of the guide post (4) are connected with the upper fixed connecting block (1), the punch connecting block (2), the fixed base (14) or the lower fixed connecting block (15) through positioning pins during fixed connection.
8. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the upper fixed connecting block (1) and the lower fixed connecting block (15) are identical in structure and are composed of a fixed plate and a mounting plate connected with the fixed plate, mounting holes used for being connected with test equipment are formed in the fixed plate, and mounting holes used for mounting guide columns are formed in the mounting plate.
9. The clamp for the three-point bending test of the small sample according to claim 1, wherein: the number of the outer guide posts or the inner guide posts of the guide posts (4) is 2, 3 or 4, and the guide posts are uniformly arranged in the radial direction of the clamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921821278.XU CN211740927U (en) | 2019-10-28 | 2019-10-28 | Clamp for three-point bending test of small sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921821278.XU CN211740927U (en) | 2019-10-28 | 2019-10-28 | Clamp for three-point bending test of small sample |
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| Publication Number | Publication Date |
|---|---|
| CN211740927U true CN211740927U (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921821278.XU Withdrawn - After Issue CN211740927U (en) | 2019-10-28 | 2019-10-28 | Clamp for three-point bending test of small sample |
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| CN (1) | CN211740927U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730098A (en) * | 2019-10-28 | 2021-04-30 | 核工业西南物理研究院 | Clamp for three-point bending test of small sample |
-
2019
- 2019-10-28 CN CN201921821278.XU patent/CN211740927U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730098A (en) * | 2019-10-28 | 2021-04-30 | 核工业西南物理研究院 | Clamp for three-point bending test of small sample |
| CN112730098B (en) * | 2019-10-28 | 2024-06-11 | 核工业西南物理研究院 | Clamp for three-point bending test of small sample |
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