CN107024382B - Auxiliary device of Hopkinson pressure bar device - Google Patents
Auxiliary device of Hopkinson pressure bar device Download PDFInfo
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- CN107024382B CN107024382B CN201710457216.4A CN201710457216A CN107024382B CN 107024382 B CN107024382 B CN 107024382B CN 201710457216 A CN201710457216 A CN 201710457216A CN 107024382 B CN107024382 B CN 107024382B
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- rod
- side plate
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- supporting
- test piece
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- 238000012360 testing method Methods 0.000 claims abstract description 68
- 230000001681 protective effect Effects 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims description 30
- 239000011358 absorbing material Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims 1
- 229920005372 Plexiglas® Polymers 0.000 claims 1
- 239000012634 fragment Substances 0.000 abstract description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003280 down draw process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding 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
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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 discloses an auxiliary device of a Hopkinson pressure bar device, which comprises: a support plate; an adjusting bolt in threaded connection with the support plate; the support rod is positioned above the support plate and sleeved on the adjusting bolt, and the support rod can rotate relative to the adjusting bolt; the tray is arranged at the top end of the supporting rod and is used for supporting a test piece. When the test is carried out, firstly, the test piece is placed between the incidence rod and the transmission rod, then the adjusting bolt is screwed, the position of the supporting rod is adjusted, the tray on the supporting rod is located at the bottom of the test piece and used for supporting the test piece, then the supporting rod is rotated, the tray is centered with the test piece, and finally the incidence rod and the transmission rod are pushed to clamp the test piece. Because the test piece is supported by the tray, the test piece does not slip down or fall off. In addition, the invention is additionally provided with the protective box, and the test space is limited in the protective box, so that the splash fragments can be prevented from injuring operators.
Description
Technical Field
The invention relates to the field of test devices for testing material dynamics characteristics at a high strain rate, in particular to an auxiliary device of a Hopkinson pressure bar device.
Background
The Hopkinson pressure bar device is a basic test device for testing the dynamic characteristics of materials under high strain rate, and is widely applied to the test of the dynamic characteristics of the materials under the high strain rate due to the advantages of simple structure, convenient operation, easy control of loading waveforms and the like. In the test process, the incident rod and the transmission rod clamp the test piece, and then the incident rod is impacted, so that the test piece is impacted at a high speed, and an operator records the whole process that the test piece is damaged. The test piece is sandwiched between the incident and transmission bars, and in order to reduce friction between the test piece and the incident and transmission bars, a lubricant is typically applied to the ends of the test piece prior to testing. However, since friction between the test piece and the incident rod and the transmission rod is reduced, the test piece is easily moved or falls off under the action of gravity, so that the test piece cannot be coaxial with the incident rod and the transmission rod, and further errors or even mistakes are generated in the test.
Therefore, how to ensure that the test piece is coaxial with the incident rod and the transmission rod during the hopkinson pressure bar test, so as to improve the accuracy of the test is a critical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide an auxiliary device for Hopkinson pressure bar test, which can ensure that a test piece is coaxial with an incident bar and a transmission bar, thereby improving the accuracy of the test.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an auxiliary device for a hopkinson pressure bar device, comprising:
a support plate;
an adjusting bolt in threaded connection with the support plate;
the support rod is positioned above the support plate and sleeved on the adjusting bolt, and the support rod can rotate relative to the adjusting bolt;
the tray is arranged at the top end of the supporting rod and is used for supporting a test piece.
Preferably, the device further comprises a suspension rod, wherein the support plate is connected to the suspension rod, and the suspension rod can drive the support plate to move up and down.
Preferably, a section of mounting thread is arranged at the bottom of the suspension rod, and the mounting thread penetrates through the supporting plate; the support plate is locked on the suspension rod through the upper nut and the lower nut.
Preferably, the device further comprises a protective box, wherein the supporting plate, the adjusting bolt, the supporting rod and the tray are all positioned in the protective box;
the incident rod and the transmission rod are respectively arranged in the first side plate and the second side plate of the protective box in a penetrating way;
at least one of the third side plate and the fourth side plate of the protective box is made of transparent material, and at least one of the third side plate and the fourth side plate of the protective box is openable.
Preferably, the suspension rod is arranged in the top cover of the protective box in a penetrating way, an adjusting thread is arranged on the suspension rod, and an adjusting nut matched with the adjusting thread locks the suspension rod on the top cover.
Preferably, the number of the suspension rods is two, the suspension rods are distributed on two sides of the supporting plate, and the top ends of the two suspension rods are connected through the cross rod.
Preferably, the device further comprises a collecting box arranged at the bottom of the protective box.
Preferably, the third side plate and the fourth side plate of the protective box are transparent organic glass plates;
the protection box is further provided with a first clamping groove and a second clamping groove which are matched with the third side plate and the fourth side plate respectively, and the third side plate and the fourth side plate can be inserted into the first clamping groove and the second clamping groove respectively and can be pulled out of the first clamping groove and the second clamping groove respectively.
Preferably, the bottom plate of the protection box is provided with a first fixing plate and a second fixing plate which respectively extend out of the first side plate and the second side plate, and the first fixing plate and the second fixing plate are respectively provided with bolt holes for fixing the protection box on the cross beam.
Preferably, foam sound absorbing materials are arranged on the inner wall of the protective box.
Preferably, a top cover handle is arranged on the top cover of the protective box.
According to the technical scheme, when a test is carried out, the test piece is firstly placed between the incidence rod and the transmission rod, then the adjusting bolt is screwed, the position of the supporting rod is adjusted, the tray on the supporting rod is located at the bottom of the test piece and used for supporting the test piece, the supporting rod is rotated, the tray is centered with the test piece, and finally the incidence rod and the transmission rod are pushed to clamp the test piece. Because the test piece is supported by the tray, the test piece does not slide downwards or fall off, so that the coaxial of the test piece, the incident rod and the transmission rod is ensured, and the accuracy of the Hopkinson pressure bar test is improved.
Drawings
In order to more clearly illustrate the solution of the embodiments of the present invention, the following description will briefly explain the drawings needed to be used in the embodiments, it being evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall structure of an auxiliary device of a hopkinson pressure bar device according to an embodiment of the present invention;
FIG. 2 is a front cross-sectional view of FIG. 1;
fig. 3 is a side cross-sectional view of fig. 1.
The device comprises an incident rod 1, a transmission rod 2, an adjusting nut 3, an adjusting bolt 4, a tray 5, a supporting rod 6, a first clamping groove 7, a collecting box 8, a second clamping groove 9, a fixing bolt 10, a test piece 11, a top cover handle 12, a hanging rod 13, a supporting plate 14, a top cover 15, a first fixing plate 16, a second fixing plate 17, a first side plate 18, a second side plate 19, a third side plate 20 and a fourth side plate 21.
Detailed Description
The invention provides an auxiliary device for Hopkinson pressure bar test, which can ensure that a test piece is coaxial with an incident bar and a transmission bar, thereby improving the accuracy of the test.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Please refer to fig. 1-3. In one embodiment of the present invention, the auxiliary device for the hopkinson press test includes a support plate 14, an adjusting bolt 4, a support rod 6, and a tray 5.
The support plate 14 serves to support the tray 5. The adjusting bolt 4 is screwed with the support plate 14. The support rod 6 is located above the support plate 14, and the support rod 6 is of a hollow structure, the support rod 6 is sleeved on the adjusting bolt 4, and the support rod 6 can rotate relative to the adjusting bolt 4. The tray 5 is arranged at the top end of the support bar 6. The pallet 5 may be welded to the support bar 6 by means of welding. When the supporting rod 6 rotates, the tray 5 can be driven to rotate together, so that the centering of the tray 5 and the test piece 11 is realized. When the adjusting bolt 4 is screwed, the supporting rod 6 can move up and down, so that the up and down adjustment of the tray 5 can be realized.
When the test is carried out, firstly, the test piece 11 is placed between the incidence rod 1 and the transmission rod 2, then the adjusting bolt 4 is screwed, the position of the supporting rod 6 is adjusted, the tray 5 on the supporting rod 6 is positioned at the bottom of the test piece 11 and used for supporting the test piece 11, then the supporting rod 6 is rotated, the tray 5 is centered with the test piece 11, and finally the incidence rod 1 and the transmission rod 2 are pushed to clamp the test piece 11. Because the test piece 11 is supported by the tray 5, the test piece 11 does not slide down or fall off, so that the test piece 11 is ensured to be coaxial with the incident rod 1 and the transmission rod 2, and the accuracy of the Hopkinson pressure bar test is improved.
In a specific embodiment of the present invention, a suspension rod 13 connected to the support plate 14 is added, and the suspension rod 13 can move up and down, so that the suspension rod 13 can drive the support plate 14, the support rod 6 and the tray 5 to move up and down, thereby realizing coarse adjustment of the vertical displacement of the tray 5. The adjusting bolt 4 achieves a fine adjustment of the vertical position of the tray 5. In this way, the position of the tray 5 can be adjusted very conveniently. The up-and-down movement of the suspension rod 13 may be achieved in various ways, such as a cylinder, a screw, etc.
In a specific embodiment of the invention, the bottom of the cantilever 13 is provided with a section of mounting threads that extend through the support plate 14. The present embodiment also includes an upper nut and a lower nut. The upper nut is located above the support plate 14, the lower nut is located below the support plate 14, and the upper nut and the lower nut are screwed, thereby locking the support plate 14 to the hanger bar 13. In this embodiment, the support plate 14 can be moved up and down within the length of the mounting threads to achieve further coarse adjustment of the support plate 14, and the upper and lower nuts are tightened when the support plate 14 is moved into position. In addition, the supporting plate 14 and the suspension rod 13 in the embodiment are detachably connected, and when the supporting plate 14 is damaged, the supporting plate 14 can be replaced conveniently.
In one embodiment of the invention, the device further comprises a protective box. The supporting plate 14, the supporting rod 6, the tray 5 and the adjusting bolt 4 are all arranged in the protective box. The protective box is provided with four side plates. The incident rod 1 and the transmission rod 2 are respectively penetrated in the first side plate 18 and the second side plate 19. At least one of the third side plate 20 and the fourth side plate 21 is made of transparent material, so that an operator can observe the test process in the protective box conveniently. In addition, at least one of the third side plate 20 and the fourth side plate 21 is openable, so that the position of the tray 5 can be conveniently debugged, and after the completion of the debugging, the tray can be closed. The openable type can be opened in a drawing mode or in a turnover mode. The embodiment limits the test space in the protective box, so that splashed fragments can be prevented from injuring operators, and the safety performance of the test is effectively improved.
In an embodiment of the present invention, the suspension rod 13 is inserted into the top cover 15 of the protection box, or the suspension rod 13 extends out of the top cover 15. The cantilever 13 is provided with an adjusting thread, and an adjusting nut 3 matched with the adjusting thread can lock the cantilever 13 on the top cover 15. It will be appreciated by those skilled in the art that the axial length of the adjustment screw is the range of up and down movement of the cantilever 13. The axial length of the adjusting screw thread can be set according to actual needs.
Further, in order to secure the smoothness of the suspension rods 13, the suspension rods 13 may be provided in two. Two suspension rods 13 are distributed on both sides of the support plate 14. The tops of the two suspension rods 13 are connected as a whole by a cross bar.
Fragments can be generated in the test process, and a collection box 8 can be arranged at the bottom of the protection box for facilitating the collection of the fragments. In this way, the splashed fragments eventually fall into the collection box 8. After which the third side plate 20 or the fourth side plate 21 is opened to take out the collecting box 8. In addition, a handle can be arranged on the collecting box 8, so that an operator can conveniently take out the collecting box 8.
In one embodiment of the present invention, the third side plate 20 and the fourth side plate 21 of the protection box are transparent organic glass plates, which is more convenient for the operator to observe. In addition, the present embodiment also provides the third side plate 20 and the fourth side plate 21 to be detachable. The specific detachable structure is as follows: the protective box is provided with a first clamping groove 7 matched with the third side plate 20 and a second clamping groove 9 matched with the fourth side plate 21. The third side plate 20 can be inserted into the first clamping groove 7, so that the installation of the third side plate 20 is realized, and the third side plate 20 can also be pulled out from the first clamping groove 7, so that the opening of the third side plate 20 is realized. The fourth side plate 21 can be inserted into the second card slot 9 and can be pulled out from the second card slot 9. The first clamping groove 7 and the second clamping groove 9 can be vertical or horizontal, and respectively correspond to the up-down drawing and the left-right drawing of the third side plate 20 and the fourth side plate 21.
In a specific embodiment of the invention, the bottom plate of the protective box has a first fixing plate 16 and a second fixing plate 17 extending from a first side plate 18 and a second side plate 19, respectively. It is also understood that the first fixing plate 16 and the second fixing plate 17 are extensions of the bottom plate in the direction of the incident beam 1 or the transmission beam 2. The first fixing plate 16 and the second fixing plate 17 are each provided with bolt holes for fixing the protection box to the cross beam, so that the stability of the protection box can be ensured. The cross beam is a cross beam in a Hopkinson pressure bar device.
In order to reduce test noise and optimize test environment, in one embodiment of the present invention, foam sound absorbing material 9 is provided on the inner wall of the protective housing.
To facilitate opening of the top cover 15, a top cover handle 12 may also be provided on the top cover 15.
In summary, in the test, the third side plate 20 and the fourth side plate 21 are first pulled out, and the incident rod 1 and the transmission rod 2 are adjusted to appropriate positions so as to leave an installation distance therebetween. The hanger bar 13 is then moved so that the tray 5 is adjacent to the incident bar 1 and the transmission bar 2, which is a rough adjustment, and after the rough adjustment is in place, the adjustment nut 3 is tightened to lock the hanger bar 13 to the top cover 15. Then, the test piece 11 coated with the lubricant is placed between the incidence rod 1 and the transmission rod 2, then the adjusting bolt 4 is screwed, the tray 5 supports the test piece 11 and is aligned with the test piece 11, fine adjustment is achieved, then the incidence rod 1 and the transmission rod 2 are moved, the test piece 11 is clamped, and finally the third side plate 20 and the fourth side plate 21 are respectively inserted into the first clamping groove 7 and the second clamping groove 9, so that the protective box is in a closed state. After the test is finished, the third side plate 20 and the fourth side plate 21 are pulled out, the incident rod 1 and the transmission rod 2 are moved to proper positions, and a proper distance is left between the incident rod 1 and the transmission rod to prevent interference between the support rod 6 and the tray 5 after the subsequent upward movement. The adjusting nut 3 is unscrewed, the suspension rod 13 is moved upwards, so that enough space is left below the supporting plate 14 for taking out the collecting box 8, and after the adjusting nut 3 is moved in place, the adjusting nut is locked. Finally, the collection box 8 is pulled out and the collected fragments are poured into a test bag.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An auxiliary device for a hopkinson pressure bar device, comprising:
a support plate (14);
an adjusting bolt (4) in threaded connection with the support plate (14);
the support rod (6) is arranged above the support plate (14) and sleeved on the adjusting bolt (4), and the support rod (6) can rotate relative to the adjusting bolt (4);
the tray (5) is arranged at the top end of the supporting rod (6), and the tray (5) is used for supporting a test piece (11);
the device also comprises a suspension rod (13), wherein the supporting plate (14) is connected to the suspension rod (13), and the suspension rod (13) can drive the supporting plate (14) to move up and down;
the bottom of the suspension rod (13) is provided with a section of mounting thread, and the mounting thread penetrates through the supporting plate (14); the device further comprises an upper nut and a lower nut which are matched with the mounting threads, and the upper nut and the lower nut lock the supporting plate (14) on the suspension rod (13);
the device also comprises a protective box, wherein the supporting plate (14), the adjusting bolt (4), the supporting rod (6) and the tray (5) are all positioned in the protective box;
the incidence rod (1) and the transmission rod (2) are respectively arranged in a first side plate (18) and a second side plate (19) of the protective box in a penetrating way;
at least one of the third side plate (20) and the fourth side plate (21) of the protective box is made of transparent material, and at least one of the third side plate and the fourth side plate is openable;
the cantilever (13) is provided with a section of adjusting screw thread, the adjusting screw thread penetrates through the top cover (15) of the protective box, and the adjusting nut (3) matched with the adjusting screw thread locks the cantilever (13) on the top cover (15).
2. The auxiliary device of the hopkinson pressure bar device according to claim 1, wherein two suspension rods (13) are distributed on two sides of the supporting plate (14), and the top ends of the two suspension rods (13) are connected through a cross rod.
3. The auxiliary device of a hopkinson pressure bar arrangement according to claim 1, further comprising a collecting box (8) arranged at the bottom of the protective box.
4. Auxiliary device of hopkinson pressure bar arrangement according to claim 1, characterized in that the third side plate (20) and the fourth side plate (21) of the protective box are transparent plexiglass plates;
the protection box is further provided with a first clamping groove (7) and a second clamping groove (9) which are matched with the third side plate (20) and the fourth side plate (21) respectively, and the third side plate (20) and the fourth side plate (21) can be inserted into the first clamping groove (7) and the second clamping groove (9) respectively and can be pulled out from the first clamping groove (7) and the second clamping groove (9) respectively.
5. The auxiliary device of a hopkinson pressure bar device according to claim 1, characterized in that the bottom plate of the protective box is provided with a first fixing plate (16) and a second fixing plate (17) which respectively extend out of the first side plate (18) and the second side plate (19), and bolt holes for fixing the protective box on a cross beam are arranged on the first fixing plate (16) and the second fixing plate (17).
6. The auxiliary device for a hopkinson pressure bar apparatus as claimed in claim 1, wherein a foam sound absorbing material is provided on an inner wall of the protective case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710457216.4A CN107024382B (en) | 2017-06-16 | 2017-06-16 | Auxiliary device of Hopkinson pressure bar device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710457216.4A CN107024382B (en) | 2017-06-16 | 2017-06-16 | Auxiliary device of Hopkinson pressure bar device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107024382A CN107024382A (en) | 2017-08-08 |
| CN107024382B true CN107024382B (en) | 2023-11-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710457216.4A Active CN107024382B (en) | 2017-06-16 | 2017-06-16 | Auxiliary device of Hopkinson pressure bar device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107024382B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202471505U (en) * | 2012-02-16 | 2012-10-03 | 安徽理工大学 | Protection and specimen bracket mechanism for hopkinson pressure bar test device |
| CN104198274A (en) * | 2014-09-16 | 2014-12-10 | 福建江夏学院 | Novel support device of split Hopkinson pressure bar and adjustment method of support device |
| CN204086002U (en) * | 2014-10-09 | 2015-01-07 | 中国工程物理研究院总体工程研究所 | A kind of test specimen bracing or strutting arrangement for Hopkinson pressure bar system |
| CN205317567U (en) * | 2015-12-31 | 2016-06-15 | 宁波大学 | Be applied to hopkinson pressure bar's piece collection and safety device and test bench |
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN205958353U (en) * | 2016-08-25 | 2017-02-15 | 安徽理工大学 | A support and protector for SHPB is experimental |
| CN206248480U (en) * | 2016-12-15 | 2017-06-13 | 东莞天诚仪器设备有限公司 | A kind of practical tensile testing machine |
| CN206804416U (en) * | 2017-06-16 | 2017-12-26 | 广东工业大学 | The servicing unit of Hopkinson pressure bar device |
-
2017
- 2017-06-16 CN CN201710457216.4A patent/CN107024382B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202471505U (en) * | 2012-02-16 | 2012-10-03 | 安徽理工大学 | Protection and specimen bracket mechanism for hopkinson pressure bar test device |
| CN104198274A (en) * | 2014-09-16 | 2014-12-10 | 福建江夏学院 | Novel support device of split Hopkinson pressure bar and adjustment method of support device |
| CN204086002U (en) * | 2014-10-09 | 2015-01-07 | 中国工程物理研究院总体工程研究所 | A kind of test specimen bracing or strutting arrangement for Hopkinson pressure bar system |
| CN205317567U (en) * | 2015-12-31 | 2016-06-15 | 宁波大学 | Be applied to hopkinson pressure bar's piece collection and safety device and test bench |
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN205958353U (en) * | 2016-08-25 | 2017-02-15 | 安徽理工大学 | A support and protector for SHPB is experimental |
| CN206248480U (en) * | 2016-12-15 | 2017-06-13 | 东莞天诚仪器设备有限公司 | A kind of practical tensile testing machine |
| CN206804416U (en) * | 2017-06-16 | 2017-12-26 | 广东工业大学 | The servicing unit of Hopkinson pressure bar device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107024382A (en) | 2017-08-08 |
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