CN107941600B - Buffer device for composite material tensile test - Google Patents
Buffer device for composite material tensile test Download PDFInfo
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- CN107941600B CN107941600B CN201711313774.XA CN201711313774A CN107941600B CN 107941600 B CN107941600 B CN 107941600B CN 201711313774 A CN201711313774 A CN 201711313774A CN 107941600 B CN107941600 B CN 107941600B
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- 239000000872 buffer Substances 0.000 title claims abstract description 40
- 238000009864 tensile test Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 abstract description 22
- 238000004154 testing of material Methods 0.000 abstract description 17
- 230000003139 buffering effect Effects 0.000 description 12
- 230000006378 damage Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a buffer device for a composite material tensile test, which comprises: the main body box, the first-stage top plate and the second-stage top plate; the middle part of the upper end of the main body box is provided with an upper latch head, the middle part of the lower end of the main body box is provided with a through hole, and a cavity is arranged in the main body box; the first-stage top plate is arranged in the cavity, and the bottom surface of the first-stage top plate is provided with a lower latch head; the lower bolt head penetrates through the through hole on the main body box and extends out of the bottom of the main body box; at least two first-stage springs are arranged on the first-stage top plate; two ends of the first-stage spring are respectively connected with the upper surface of the first-stage top plate and the top of the inner wall of the cavity; the second-stage top plate is arranged above the first-stage top plate; at least two second-stage springs are arranged on the second-stage top plate; two ends of the second-stage spring are respectively connected with the upper surface of the second-stage top plate and the top of the inner wall of the cavity. The invention can effectively avoid the impact force of the upper chuck of the material testing machine from damaging or even destroying the test piece.
Description
Technical Field
The application relates to the technical field of composite material tensile tests, in particular to a buffer device for a composite material tensile test.
Background
In performing the composite tensile test, the tensile test may be performed using a non-destructive test method. The core of the non-damage test method is as follows: the same test specimens were used to test the modulus of elasticity throughout the aging period. Therefore, ensuring that the test piece is not destroyed during the tensile test is critical to the success or failure of the test.
In the prior art, tensile testing of composite materials is typically performed using a material testing machine. FIG. 1 is a schematic diagram of the device connection during a tensile test of a composite material according to the prior art. As shown in fig. 1, an upper chuck 12 of the material testing machine is fixedly connected with a reaction beam 11 of the testing machine; the lower clamping head 13 of the material testing machine is fixed on the base 14; the tester reaction beam 11 is connected with the base 14 through a tester jacking column 15.
When a composite material tensile test is carried out, an upper chuck 12 and a lower chuck 13 of the material testing machine respectively clamp two ends of a sample 10; then, the upper chuck 12 of the material testing machine is slowly lifted to provide a corresponding pulling force to stretch the test specimen 10, thereby performing a corresponding tensile test.
In the prior art, material testing machines (e.g., universal testing machines) are often used that are capable of stopping automatically or manually at a certain prescribed deformation or tensile value. However, when the material testing machine reaches a specified tensile force and stops during the tensile test of the composite material, the counter-force beam 11 and the lower chuck 13 of the testing machine immediately stop, and the upper chuck 12 continues to drive the sample 10 upwards due to inertia. Moreover, when the upper jaw 12 is suddenly stopped from the upward pulled state, the upper jaw 12 will generate a large impact force on the specimen 10. The impact force often damages or even destroys the test piece, resulting in failure of the tensile test of the composite material.
Therefore, how to effectively avoid the damage or even destruction of the test piece caused by the impact force of the upper chuck has become a urgent problem in the art.
Disclosure of Invention
In view of the above, the invention provides a buffer device for a composite material tensile test, so that damage or even destruction of a test piece caused by impact force of an upper chuck of a material testing machine can be effectively avoided.
The technical scheme of the invention is realized specifically as follows:
a buffer device for a tensile test of a composite material, the buffer device comprising: the main body box, the first-stage top plate and the second-stage top plate;
an upper latch head is arranged in the middle of the upper end of the main body box; the middle part of the lower end of the main body box is provided with a through hole; a cavity is formed in the main body box;
the first-stage top plate is arranged in the cavity, and a lower latch head is arranged on the bottom surface of the first-stage top plate; the lower latch head penetrates through the through hole in the main body box and extends out of the bottom of the main body box; at least two first-stage springs are arranged on the first-stage top plate; two ends of the first-stage spring are respectively connected with the upper surface of the first-stage top plate and the top of the inner wall of the cavity;
the second-stage top plate is arranged above the first-stage top plate, and at least two second-stage springs are arranged on the second-stage top plate; and two ends of the second-stage spring are respectively connected with the upper surface of the second-stage top plate and the top of the inner wall of the cavity.
Preferably, the buffer device further comprises: a third stage top plate;
the third-stage top plate is arranged above the second-stage top plate, and at least two third-stage springs are arranged on the third-stage top plate; and two ends of the third-stage spring are respectively connected with the upper surface of the third-stage top plate and the top of the inner wall of the cavity.
Preferably, a displacement limiting block is arranged at the top of the inner wall of the cavity of the main body box of the buffer device.
Preferably, two ends of the top plates of all levels except the top plate of the first level are respectively connected with the top of the inner wall of the cavity through inhaul cables.
Preferably, at least one bayonet lock is respectively arranged at two ends of the first-stage top plate;
and clamping grooves corresponding to the clamping pins are respectively arranged on the two side walls of the cavity.
Preferably, each spring in each stage of springs is symmetrically distributed along the length direction of the main body box.
Preferably, 4 first-stage springs are arranged on the first-stage top plate;
2 second-stage springs are arranged on the second-stage top plate;
and 2 third-stage springs are arranged on the third-stage top plate.
Preferably, the upper bolt head is further provided with a first bolt hole for the bolt to pass through.
Preferably, a containing cavity for the upper chuck to be inserted is formed in the bottom of the lower latch head; the lower bolt head is also provided with a second bolt hole for the bolt to pass through.
As can be seen from the above, in the buffer device for tensile test of composite material according to the present invention, since the top plate and the springs of each stage are provided, the buffer device has a good energy absorbing capability, that is, can absorb a lot of impact energy after a small displacement, so that a good buffer effect can be effectively achieved on the impact effect generated when the material testing machine is stopped, damage to a test piece due to the impact effect when the upper chuck of the material testing machine is suddenly stopped from an upward tensile state can be effectively prevented, and damage to the test piece due to an excessive buffer distance can be avoided.
Drawings
FIG. 1 is a schematic diagram of the device connection during a tensile test of a composite material according to the prior art.
Fig. 2 is a schematic view of a material testing machine provided with a buffer device in an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a buffering device according to an embodiment of the present invention.
Fig. 4 is a top view of a cushioning device in an embodiment of the present invention.
Fig. 5 is a vertical sectional view of a buffering device in an embodiment of the present invention.
Fig. 6 is a transverse cross-sectional view of a cushioning device in an embodiment of the present invention.
Fig. 7 is a schematic diagram showing a top view comparison of a first stage top plate, a second stage top plate and a third stage top plate according to an embodiment of the present invention.
FIG. 8 is a schematic view of a cushioning apparatus according to an embodiment of the present invention, wherein a first stage spring set is compressed and a second and third stage spring set is uncompressed.
FIG. 9 is a schematic view of the cushioning apparatus of the present invention with the first and second spring sets compressed and the third spring set uncompressed.
FIG. 10 is a schematic diagram of the first, second and third spring sets of the damper device according to the embodiment of the present invention when compressed.
FIG. 11 is a schematic diagram of the first, second and third spring sets in the damping device according to the embodiment of the present invention when fully compressed.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to prevent the impact action of the pull head when suddenly stopping from an upward stretching state from damaging or even destroying the test piece, the invention provides a buffer device for a composite material stretching test.
Fig. 3 is a schematic perspective view of a damper according to an embodiment of the present invention, fig. 4 is a top view of the damper according to the embodiment of the present invention, fig. 5 is a vertical sectional view of the damper according to the embodiment of the present invention, and fig. 6 is a transverse sectional view of the damper according to the embodiment of the present invention. As shown in fig. 3 to 6, the buffer device for a tensile test of a composite material according to an embodiment of the present invention includes: a main body box 51, a first stage top plate 21, and a second stage top plate 22;
an upper latch head 511 is arranged in the middle of the upper end of the main body box 51; a through hole is formed in the middle of the lower end of the main body box 51; a cavity 510 is provided inside the main body case 51;
the first stage top plate 21 is disposed in the cavity 510, and a lower latch head 211 is disposed on the bottom surface of the first stage top plate 21; the lower latch head 211 protrudes from the bottom of the main body case 51 through a through hole in the main body case 51; at least two first-stage springs 31 are arranged on the first-stage top plate 21; two ends of the first-stage spring 31 are respectively connected with the upper surface of the first-stage top plate 21 and the top of the inner wall of the cavity 510;
the second stage top plate 22 is disposed above the first stage top plate 21, and two ends of the second stage top plate 22 are respectively connected with the top of the inner wall of the cavity 510 through second cables 42; at least two second-stage springs 32 are arranged on the second-stage top plate 22; the two ends of the second-stage spring 32 are respectively connected to the upper surface of the second-stage top plate 22 and the top of the inner wall of the cavity 510.
In the above-described buffer device for composite tensile test, a two-stage top plate is provided in the cavity 510 of the main body case 51: a first stage top plate 21 and a second stage top plate 22.
In the technical scheme of the invention, an N (N is more than or equal to 2) level top plate can be arranged in the cavity of the main body box according to the requirement of the actual application condition, wherein the value of N can be preset according to the requirement of the actual application condition.
For example, as shown in fig. 5, in an embodiment of the present invention, the buffering device may further include: a third stage top plate 23;
the third stage top plate 23 is arranged above the second stage top plate 22, and at least two third stage springs 33 are arranged on the third stage top plate 23; both ends of the third stage spring 33 are respectively connected to the upper surface of the third stage top plate 23 and the top of the inner wall of the cavity 510.
At this time, the buffer device for the tensile test of the composite material in the invention is provided with three stages of top plates: a first stage top plate 21, a second stage top plate 22, and a third stage top plate 23.
The case where an M (M.gtoreq.4) stage top plate is provided in the cavity of the main body box can be analogized and is not listed here.
Fig. 2 is a schematic view of a material testing machine provided with a buffer device in an embodiment of the present invention. Fig. 8 to 11 are schematic diagrams of the operation of the buffer device according to the embodiment of the present invention, in which, as shown in fig. 2 and 8 to 11, the upper latch head 511 of the main body case 51 may be connected to the tester reaction beam 11, and the lower latch head 211 of the first stage top plate 21 may be connected to the upper chuck 12 of the material tester. Therefore, when the composite material tensile test is performed, the upward tensile force of the tester reaction beam 11 can be transmitted to the first stage top plate 21 through the main body box of the buffer device, and the sample 10 clamped by the upper clamping head 12 is driven to move upward together, so that the predetermined tensile task is completed. When the predetermined stretching is completed, the material testing machine is stopped, and the tester reaction beam 11 drives the main body box 51 of the buffer device to stop immediately. However, due to inertia, the first stage top plate 21, the upper jaw 12 and the test piece 10 in the above-described buffer device still continue to move upward. At this time, the above-described buffer device in the present invention will start to function. Taking the example that the three-stage top plate (i.e., n=3) is provided in the buffer device, the whole buffering process of the buffer device may have three buffering processes, as shown in fig. 8 to 10.
For example, in the first cushioning process shown in fig. 8, as the upper jaw continues to move upwardly, the first stage top plate 21 will also continue to move upwardly therewith, and the first stage spring 31 will first be compressed to cushion the upward impact force of the upper jaw 12.
When the first stage top plate 21 moves into contact with the second stage top plate 22, if the upper chuck is still moving upward, the second buffering process shown in fig. 9 will be entered; at this time, the second stage top plate 22 will also start to move upward under the pushing of the first stage top plate 21, the first stage spring 31 continues to be compressed, and the second stage spring 32 also starts to be compressed to continue to buffer the upward impact force of the upper chuck 12.
When the second stage top plate 22 moves into contact with the third stage top plate 23, if the upper jaw is still moving upward, the third buffering process shown in fig. 10 will be entered; at this time, the third stage top plate 23 will also start to move upward under the pushing of the second stage top plate 22, the first stage spring 31 and the second stage spring 32 continue to be compressed, and the third stage spring 33 also starts to be compressed, so as to continue to buffer the upward impact force of the upper chuck 12, until the third stage spring 33 is fully compressed, as shown in fig. 11.
In the above three buffering processes, as the upper jaw 12 moves upward, the first stage spring 31, the second stage spring 32 and the third stage spring 33 are sequentially compressed, and thus, the energy of the upper jaw 12 due to inertia is gradually consumed. If the upward movement rate (i.e., the stretching rate) of the upper jaw 12 is small, the upper jaw 12 is likely to stop moving upward before the third stage spring 33 is fully compressed, thereby achieving a buffering effect on the upward movement of the upper jaw 12 by inertia, and the upward displacement is small; moreover, even if the upward movement rate (i.e., the tensile rate) of the upper jaw 12 is large, the upward movement rate of the upper jaw 12 can be reduced to a small level so as not to damage the test specimen 10 by the compression energy consumption of the three-stage springs during the three buffering processes.
Of course, in the solution of the present invention, in order to further prevent the sample 10 from being damaged due to the large deformation, it is preferable that a displacement limiting block 513 is further provided on the top of the cavity inner wall of the main body case of the buffer device in one embodiment of the present invention. Therefore, when the third stage top plate 23 moves to contact with the displacement limiting block 513, the third stage top plate 23 will stop, so that the upper chuck 12 will eventually stop after undergoing three stage spring energy consumption, and the sample 10 can be effectively prevented from being damaged due to large deformation.
The working principle of the buffer device in the present invention is described above by taking the buffer device provided with three stages of top plates (i.e., a first stage top plate, a second stage top plate and a third stage top plate) as an example. When the buffer device is provided with the N-stage top plate, the working principle of the buffer device can be analogized, and the buffer device is not listed here.
In addition, in a preferred embodiment of the present invention, two ends of each stage of top plates except the first stage of top plate are respectively connected with the top of the inner wall of the cavity through a pull rope.
For example, as shown in fig. 5, when a three-stage top plate is provided in the above-mentioned buffer device, both ends of the second-stage top plate 22 are connected to the top of the inner wall of the cavity 510 through the stay cables 42, respectively; both ends of the third stage top plate 23 are respectively connected with the top of the inner wall of the cavity 510 through the inhaul cables 43.
Therefore, in the solution of the present invention, when the springs (e.g., the second-stage spring and the third-stage spring) of the other stages except the first-stage spring in the buffer are in the relaxed state (i.e., not compressed), the top plates (e.g., the second-stage top plate and the third-stage top plate) of the other stages except the first-stage top plate are suspended in the cavity 510 by the cables at both ends, so that the springs of the other stages except the first-stage spring can be ensured to be in the free state.
In addition, in the embodiment of the present invention, at least one locking pin 213 is preferably disposed at each of two ends of the first stage top plate 21; two side walls of the cavity 510 are respectively provided with a clamping groove 514 corresponding to the clamping pin.
Therefore, the locking pins 213 at the two ends of the first stage top plate 21 may be locked into the locking grooves 514, so that the plate surface of the first stage top plate 21 may be always kept horizontal during the up-and-down movement.
Furthermore, in the embodiment of the present invention, even when the first stage top plate 21 is not subjected to the upward force of the upper chuck 12, the first stage spring 31 may still be in a compressed state, so that the first stage top plate 21 may be closely abutted against the bottom of the inner wall of the cavity 510 by the top supporting force of the first stage spring 31.
In addition, in the technical scheme of the invention, the number and/or the positions of the springs at each stage can be preset according to the requirements of practical application conditions.
For example, in the embodiment of the present invention, 4 first stage springs 31 are preferably disposed on the first stage top plate 21; 2 second-stage springs 32 are arranged on the second-stage top plate 22; the third stage top plate 23 is provided with 2 third stage springs 33.
For example, in a preferred embodiment of the present invention, each of the springs of each stage is symmetrically distributed along the length of the main body case.
In addition, in the embodiment of the present invention, a first pin hole 512 through which the pin passes is further formed on the upper pin head 511.
Thus, the upper pin head 511 can be inserted into an interface on the test machine reaction beam 11, and then a pin can be inserted into the first pin hole 512 to connect and fix the upper pin head 511 to the test machine reaction beam 11.
In addition, in the embodiment of the present invention, a receiving cavity into which the upper chuck 12 is inserted is preferably provided at the bottom of the lower latch head 211; the lower pin head 211 is further provided with a second pin hole 212 through which a pin passes.
Accordingly, the upper jaw 12 may be inserted into the receiving cavity of the lower pin head 211, and then the pins may be inserted into the second pin holes 212 and the pin holes of the upper jaw 12 to connect and fix the lower pin head 211 to the upper jaw 12 of the material testing machine.
In summary, in the technical scheme of the invention, since the buffer device for the tensile test of the composite material is provided with the top plates and the springs at all levels, the buffer device has good energy absorption capability, namely, can absorb a lot of impact energy after a small displacement, thereby effectively playing a good role in buffering impact generated when the material testing machine stops, effectively preventing the impact of the upper clamping head of the material testing machine when the upper clamping head suddenly stops from an upward tensile state from damaging a test piece, and avoiding the damage of the test piece due to an excessive buffering distance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (9)
1. A buffer device for a tensile test of a composite material, the buffer device comprising: the main body box, the first-stage top plate and the second-stage top plate;
an upper latch head is arranged in the middle of the upper end of the main body box; the middle part of the lower end of the main body box is provided with a through hole; a cavity is formed in the main body box;
the first-stage top plate is arranged in the cavity, and a lower latch head is arranged on the bottom surface of the first-stage top plate; the lower latch head penetrates through the through hole in the main body box and extends out of the bottom of the main body box; at least two first-stage springs are arranged on the first-stage top plate; two ends of the first-stage spring are respectively connected with the upper surface of the first-stage top plate and the top of the inner wall of the cavity;
the second-stage top plate is arranged above the first-stage top plate, and at least two second-stage springs are arranged on the second-stage top plate; and two ends of the second-stage spring are respectively connected with the upper surface of the second-stage top plate and the top of the inner wall of the cavity.
2. The cushioning device of claim 1, further comprising: a third stage top plate;
the third-stage top plate is arranged above the second-stage top plate, and at least two third-stage springs are arranged on the third-stage top plate; and two ends of the third-stage spring are respectively connected with the upper surface of the third-stage top plate and the top of the inner wall of the cavity.
3. A cushioning device according to claim 1 or 2, wherein:
the top of the cavity inner wall of the main body box of the buffer device is provided with a displacement limiting block.
4. A cushioning device according to claim 1 or 2, wherein:
the two ends of the top plates of all levels except the top plate of the first level are respectively connected with the top of the inner wall of the cavity through inhaul cables.
5. A cushioning device according to claim 1 or 2, wherein:
at least one bayonet lock is respectively arranged at two ends of the first-stage top plate;
and clamping grooves corresponding to the clamping pins are respectively arranged on the two side walls of the cavity.
6. A cushioning device according to claim 1 or 2, wherein:
each spring in each stage of springs is symmetrically distributed along the length direction of the main body box.
7. The cushioning device of claim 2, wherein:
4 first-stage springs are arranged on the first-stage top plate;
2 second-stage springs are arranged on the second-stage top plate;
and 2 third-stage springs are arranged on the third-stage top plate.
8. A cushioning device according to claim 1 or 2, wherein:
the upper bolt head is also provided with a first bolt hole for the bolt to pass through.
9. A cushioning device according to claim 1 or 2, wherein:
the bottom of the lower latch head is provided with a containing cavity into which the upper chuck is inserted; the lower bolt head is also provided with a second bolt hole for the bolt to pass through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313774.XA CN107941600B (en) | 2017-12-12 | 2017-12-12 | Buffer device for composite material tensile test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313774.XA CN107941600B (en) | 2017-12-12 | 2017-12-12 | Buffer device for composite material tensile test |
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| CN107941600A CN107941600A (en) | 2018-04-20 |
| CN107941600B true CN107941600B (en) | 2024-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111175133B (en) * | 2020-01-13 | 2021-04-09 | 江苏华脉新材料有限公司 | Tension testing machine for pre-twisted hardware fitting |
| CN111766132A (en) * | 2020-07-15 | 2020-10-13 | 华北水利水电大学 | Metal mesh tensile quality detection device and operation method thereof |
| CN112857985B (en) * | 2021-02-08 | 2023-11-17 | 浙江义宇仪器设备有限公司 | Universal material testing machine |
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| CN207850807U (en) * | 2017-12-12 | 2018-09-11 | 中冶建筑研究总院有限公司 | A kind of buffer unit for composite material tension test |
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2017
- 2017-12-12 CN CN201711313774.XA patent/CN107941600B/en active Active
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|---|---|---|---|---|
| CN201075076Y (en) * | 2007-09-24 | 2008-06-18 | 武汉钢铁(集团)公司 | Whole energy level drop hammer type shock testing machine |
| KR101244705B1 (en) * | 2012-08-24 | 2013-03-18 | 지케이엔지니어링(주) | Impact cushioned carrier for transferring a undisturbed soil |
| CN103308300A (en) * | 2013-06-06 | 2013-09-18 | 北京大学 | Buffer device for super-heavy-load tensile tester |
| CN104749029A (en) * | 2015-03-23 | 2015-07-01 | 中国船舶重工集团公司第七二五研究所 | Constant-load tensile test device |
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