CN112730106A - Miniature Hopkinson pull rod device - Google Patents
Miniature Hopkinson pull rod device Download PDFInfo
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- CN112730106A CN112730106A CN202110089296.9A CN202110089296A CN112730106A CN 112730106 A CN112730106 A CN 112730106A CN 202110089296 A CN202110089296 A CN 202110089296A CN 112730106 A CN112730106 A CN 112730106A
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- 238000012360 testing method Methods 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 238000010521 absorption reaction Methods 0.000 claims abstract description 20
- 239000000725 suspension Substances 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000012780 transparent material Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- 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
- G01N3/04—Chucks
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
Abstract
The invention provides a micro Hopkinson pull rod device, which comprises: the angle-adjustable base is connected to the fixing piece, and the top end of the base is provided with a plurality of supporting seats; the supporting rod is supported at the bottom end of the base; the base is provided with a transmission rod, an incident rod and an absorption rod from top to bottom in sequence, the absorption rod is abutted against the buffer seat, and a test piece is suitable for being connected between the incident rod and the transmission rod; the incident rod is fixedly sleeved with a flange, the flange is arranged close to the absorption rod, and the outer diameter of the flange is larger than the aperture of the through hole; the incident rod is sleeved with a tubular bullet in a sliding mode, and the tubular bullet slides to impact the flange to enable the incident rod to move towards the absorption rod after being in contact with the power storage spring fixed on the supporting seat. The invention controls the incidence speed of the tubular bullet by changing the inclination angle of the base, the tubular bullet collides with the flange under the action of the self gravity and the elastic force of the power storage spring, and a driving piece is not required to be additionally arranged, thereby being beneficial to the miniaturization of the whole device, and the tubular bullet has low cost and easy operation.
Description
Technical Field
The invention relates to the technical field of dynamic mechanical property testing, in particular to a micro Hopkinson pull rod device.
Background
The Hopkinson pull rod is an experimental device which can be used for carrying out dynamic experimental research on materials, and is widely applied to testing the dynamic mechanical properties of the materials. At present, a micro Hopkinson pull rod device comprises an air gun, an incident rod, a transmission rod and an absorption rod, wherein a flange and an impact tube are arranged in the air gun, and a test piece is connected between the incident rod and the transmission rod; and filling gas into the air gun to enable the impact tube to impact the flange and further pull the incident rod.
The micro Hopkinson pull rod device needs a series of devices such as an air gun and a high-pressure air tank to drive the incident rod to move, so that the cost and the occupied space of the whole device are increased.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of high cost and large volume of the driving system of the micro hopkinson pull rod device in the prior art, so as to provide a micro hopkinson pull rod device.
In order to solve the above technical problem, the micro hopkinson pull rod device provided by the present invention includes:
the angle-adjustable support device comprises a base, a fixing piece and a support frame, wherein one end of the base is connected to the fixing piece in an angle-adjustable manner, the top end of the base is provided with a plurality of support seats which are arranged at intervals, and the support seats are provided with through holes;
the supporting mechanism is provided with a supporting rod arranged towards the base, and one end of the supporting rod is supported at the bottom end of the base;
the base is provided with a transmission rod, an incident rod and an absorption rod which sequentially slide from top to bottom and penetrate through the through hole, one end of the absorption rod, which is far away from the incident rod, is abutted against the buffer seat, and a test piece is suitable to be connected between the incident rod and the transmission rod;
the incident rod is fixedly sleeved with a flange, the flange is arranged close to the absorption rod, and the outer diameter of the flange is larger than the aperture of the through hole; the incident rod is sleeved with a tubular bullet in a sliding mode, and the tubular bullet is suitable for sliding to impact the flange and enable the incident rod to move towards the absorption rod.
Preferably, the method further comprises the following steps:
the power accumulating spring is sleeved at the upstream of the incident rod, one end of the power accumulating spring is connected with the supporting seat, and the other end of the power accumulating spring is suitable for being in compression butt joint with the tubular bullet.
Preferably, the method further comprises the following steps:
and the suspension spring is arranged right above the incident rod upstream, one end of the suspension spring is fixed, and the other end of the suspension spring is connected to the incident rod upstream.
Preferably, the support mechanism includes:
the supporting plate is arranged below the base, and the top end of the supporting plate is provided with a sliding block in sliding arrangement;
one end of the supporting rod is hinged on the sliding block, and the other end of the supporting rod is hinged on the bottom end of the base.
Preferably, a clamp is arranged between the incident rod and the transmission rod, a slot suitable for connecting a test piece is formed in the clamp, and the slot is axially aligned with the incident rod and the transmission rod.
Preferably, the jig includes:
the first clamping column is connected to the end part of the incident rod and is provided with a first half shaft and a second half shaft which are oppositely buckled; a groove is arranged on the buckling surface of the first half shaft and the second half shaft along the axis of the first half shaft and the second half shaft, and the test piece is suitable for being connected in the groove;
the second clamping column is connected to the end part of the transmission rod and is provided with a third half shaft and a fourth half shaft which are oppositely buckled; the buckling surfaces of the third half shaft and the fourth half shaft are provided with grooves along the axes of the third half shaft and the fourth half shaft, and the test piece is suitable for being connected in the grooves.
Preferably, the method further comprises the following steps:
the environment case is connected the top of base to locate the incidence pole with between the transmission pole, the incidence pole and the one end that is suitable for being connected with the test piece of transmission pole stretches into in the environment case.
As a preferred scheme, the side wall of the environment box is provided with an air port communicated with the inner cavity, and the air port is suitable for being communicated with the heating and humidifying equipment.
Preferably, at least one side surface of the environment box is made of transparent materials.
The technical scheme of the invention has the following advantages:
1. according to the micro Hopkinson pull rod device provided by the invention, the incidence speed of the tubular bullet is controlled by changing the inclination angle of the base, and the tubular bullet impacts the flange to enable the incidence rod to drive the test piece to stretch towards the absorption rod; the tubular bullet is impacted with the flange under the action of self gravity, and a driving piece is not additionally arranged, so that the miniaturization of the whole device is facilitated, the cost is low, and the tubular bullet is easy to control.
2. According to the micro Hopkinson pull rod device provided by the invention, the tubular bullet is launched after compressing the force storage spring, so that the tubular bullet can obtain higher speed to meet higher speed requirements, and the tension range of the incident rod is expanded.
3. According to the micro Hopkinson pull rod device provided by the invention, the incident rod is obliquely arranged, and the gravity of the incident rod can generate a gravity component downwards along the axis, so that the incident rod slides towards the absorption rod; suspension spring can produce along the ascending pulling force component of axis to the vertical pulling force of incident pole, and its gravity component can be offset to this pulling force component, avoids the incident pole to lead to mechanical testing result inaccurate because of the action of gravity moves down.
4. According to the micro Hopkinson pull rod device provided by the invention, one end of the support rod supports the base, and the other end of the support rod can slide along the support plate; through adjusting the position of bracing piece in the backup pad, can realize the regulation to the inclination of base, simple structure, flexible operation.
5. According to the micro Hopkinson pull rod device provided by the invention, the clamp is provided with the groove holes axially aligned with the incident rod and the transmission rod, and the test piece is connected with the groove holes, so that the test piece can be sufficiently aligned with the rod piece, and the stress propagation is prevented from being influenced by the distortion deformation generated in the stretching process.
6. According to the micro Hopkinson pull rod device provided by the invention, the clamp is formed by splicing the first half shaft, the second half shaft, the third half shaft and the fourth half shaft, and the test piece is connected in the groove of the buckling surface in the splicing process, so that the test piece is more convenient to disassemble and assemble.
7. According to the micro Hopkinson pull rod device provided by the invention, in the test process, the test piece is positioned in the environment box, and the temperature and the humidity in the environment box are changed through circulating air, so that the requirements of different test conditions are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a micro hopkinson pull rod device provided in the present invention.
Fig. 2 is a schematic structural diagram of the support mechanism.
Fig. 3 is a schematic structural view of the jig.
Fig. 4 is a schematic structural diagram of the environmental chamber.
Description of reference numerals:
1. a base; 2. a fixing member; 3. a supporting seat; 4. an absorption bar; 5. an incident rod; 6. a transmission rod; 7. a buffer seat; 8. a tube-type bullet; 9. a flange; 10. an environmental chamber; 11. a support plate; 12. a slider; 13. a support bar; 14. a connecting member; 15. a linear bearing; 16. a power storage spring; 17. a suspension spring; 18. a first half shaft; 19. a second half shaft; 20. a third half shaft; 21. a fourth half shaft; 22. a first through hole; 23. a second through hole; 24. an air inlet; 25. an air outlet; 26. a test piece; 27. and (4) clamping.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The miniature hopkinson pull rod device that this embodiment provided includes: the device comprises a base 1, a fixing piece 2, a supporting seat 3, a supporting mechanism, an absorption rod 4, an incident rod 5, a transmission rod 6, a buffer seat 7, a pipe-type bullet 8, a flange 9, an environment box 10 and a clamp 27.
As shown in fig. 1 and 2, the fixing member 2 is fixed by a bolt, and the top end of the fixing member 2 is provided with two lug plates arranged at intervals; base 1 is rectangle platelike structure, base 1's one end is connected two between the otic placode, base 1 can for the otic placode rotates and locks. The supporting mechanism is positioned below the base 1 and comprises a supporting plate 11, a sliding block 12 and a supporting rod 13; the supporting plate 11 is fixed through a bolt, and a through sliding groove is formed in the top end of the supporting plate 11 and is arranged along the length direction of the base 1; the sliding block 12 is connected to the sliding groove in a sliding mode, and a hinge block extends out of the top end of the sliding block 12; one end of the supporting rod 13 is hinged to a hinge block at the top end of the sliding block 12, and the other end of the supporting rod 13 is hinged to the bottom end of the base 1 through a connecting piece 14; the inclination angle of the base 1 is adjusted by moving the position of the slider 12 on the support plate 11.
As shown in fig. 1, the six support seats 3 are arranged at intervals, and the six support seats 3 are respectively connected to the top end of the base 1 and distributed along the length direction of the base 1; the top end of the supporting seat 3 is provided with a linear bearing 15, and the center of the linear bearing 15 is provided with a through hole; six the supporting seat 3 top-down divide into three groups, is first support group, second support group and third support group respectively, has two adjacent settings in every group the supporting seat 3. The transmission rod 6 is arranged between the two supporting seats 3 of the first supporting group in a penetrating manner, the incidence rod 5 is arranged between the two supporting seats 3 of the second supporting group in a penetrating manner, and the absorption rod 4 is arranged between the two supporting seats 3 of the third supporting group in a penetrating manner. Buffer seat 7 is connected the top of base 1, and is located the downstream department of third support group, what absorb lever 4 deviates from the one end of incident pole 5 with buffer seat 7 butt. A flange 9 is fixedly sleeved on the incident rod 5, the flange 9 is positioned between the two support seats 3 of the second support group and is close to the absorption rod 4, and the outer diameter of the flange 9 is larger than the aperture of the through hole; the incident rod 5 is slidably sleeved with a tubular bullet 8, the tubular bullet 8 is located on the upstream of the flange 9, and the tubular bullet 8 can impact the flange 9 to enable the incident rod 5 to move towards the absorption rod 4. By changing the inclination angle of the base 1, the tubular bullet 8 can obtain different sliding speeds, so that the incident rod 5 obtains different pulling forces.
As shown in fig. 1, the power storage spring 16 is sleeved on the upstream of the incident rod 5, one end of the power storage spring 16 is connected to the support seat 3, and the other end of the power storage spring 16 is a free end; the tubular bullet 8 can compress the free end of the power storage spring 16, so that the free end can obtain higher sliding speed, and the tension range of the incident rod 5 is expanded. The suspension spring 17 is positioned right above the upstream of the incident rod 5, the upper end of the suspension spring 17 is fixed, and the lower end of the suspension spring 17 is connected to the incident rod 5; the suspension spring 17 can offset the gravity component of the incident rod 5, and the incident rod 5 is prevented from moving downwards under the action of gravity to cause inaccurate mechanical test results.
As shown in fig. 1 and 3, the clamp 27 is connected between the incident rod 5 and the transmission rod 6, and the clamp 27 includes a first clamping column and a second clamping column. The first clamping column is of a columnar structure, is connected to the end part of the incident rod 5 and is axially aligned with the incident rod 5; the first clamping column is provided with a first half shaft 18 and a second half shaft 19 which are oppositely buckled, a buckling surface of the first half shaft 18 and the second half shaft 19 is provided with a groove along the axis thereof, and a test piece 26 can be connected in the groove; firstly, a test piece 26 is adhered in a groove between the first half shaft 18 and the second half shaft 19, then the first half shaft 18 is attached to the second half shaft 19, and finally the first clamping column is connected to the end portion of the incident rod 5. The second clamping column is of a columnar structure, is connected to the end of the transmission rod 6 and is axially aligned with the transmission rod 6; the second clamping column is provided with a third half shaft 20 and a fourth half shaft 21 which are oppositely buckled, a buckling surface of the third half shaft 20 and the fourth half shaft 21 is provided with a groove along the axis thereof, and a test piece 26 can be connected in the groove; firstly, a test piece 26 is adhered in a groove between the third half shaft 20 and the fourth half shaft 21, then the third half shaft 20 is attached to the fourth half shaft 21, and finally the second clamping column is connected to the end part of the transmission rod 6.
As shown in fig. 1 and 4, the environment box 10 is a rectangular structure, is connected to the top end of the base 1, and is disposed between the incident rod 5 and the transmission rod 6; the environment box 10 is provided with a first through hole 22 and a second through hole 23 which are opposite to each other, the incident rod 5 extends into the environment box 10 through the first through hole 22, the transmission rod 6 extends into the environment box 10 through the second through hole 23, and the clamp 27 and the test piece 26 are both located in the environment box 10. An air port communicated with the inner cavity of the environment box 10 is formed in the side wall of the environment box, and comprises an air inlet 24 and an air outlet 25; the air inlet 24 is arranged at the top of the environment box 10, and the air outlet 25 is arranged at the lower end of the rear side surface and the lower ends of the left side surface and the right side surface of the environment box 10; the air inlet 24 and the air outlet 25 are respectively connected with heating and humidifying equipment through heat preservation pipes, and the internal space of the environment box 10 is heated and humidified by circulating air to meet the requirements of different test conditions. The front side of the environment box 10 is made of transparent organic glass, and the high-speed camera can monitor the state of the test piece 26 in real time through the front side of the environment box 10.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A micro Hopkinson pull rod device, comprising:
the base (1) is connected to the fixing piece (2) in an angle-adjustable mode, a plurality of supporting seats (3) arranged at intervals are arranged at the top end of the base (1), and the supporting seats (3) are provided with through holes;
the supporting mechanism is provided with a supporting rod (13) arranged towards the base (1), and one end of the supporting rod (13) is supported at the bottom end of the base (1);
the base (1) is provided with a transmission rod (6), an incident rod (5) and an absorption rod (4) which sequentially slide from top to bottom and penetrate through the through hole, one end of the absorption rod (4) departing from the incident rod (5) is abutted to a buffer seat (7), and a test piece (26) is suitable for being connected between the incident rod (5) and the transmission rod (6);
a flange (9) is fixedly sleeved on the incident rod (5), the flange (9) is arranged close to the absorption rod (4), and the outer diameter of the flange (9) is larger than the aperture of the through hole; the incident rod (5) is sleeved with a tubular bullet (8) in a sliding mode, the tubular bullet (8) is suitable for sliding to impact the flange (9) and enable the incident rod (5) to move towards the absorption rod (4).
2. The micro hopkinson brace apparatus of claim 1, further comprising:
the power accumulating spring (16) is sleeved on the upstream of the incident rod (5), one end of the power accumulating spring (16) is connected with the supporting seat (3), and the other end of the power accumulating spring (16) is suitable for being in compression abutting joint with the tubular bullet (8).
3. The micro hopkinson brace apparatus of claim 1, further comprising:
and the suspension spring (17) is arranged right above the incident rod (5) upstream, one end of the suspension spring (17) is fixed, and the other end of the suspension spring (17) is connected to the incident rod (5) upstream.
4. The micro hopkinson brace apparatus of claim 1, wherein the support mechanism comprises:
the supporting plate (11) is arranged below the base (1), and a sliding block (12) arranged in a sliding mode is arranged at the top end of the supporting plate (11);
one end of the supporting rod (13) is hinged on the sliding block (12), and the other end of the supporting rod is hinged on the bottom end of the base (1).
5. The micro Hopkinson bar device according to claim 1, wherein a clamp (27) is arranged between the incident bar (5) and the transmission bar (6), the clamp (27) is provided with a slot hole suitable for connecting a test piece (26), and the slot hole is axially aligned with the incident bar (5) and the transmission bar (6).
6. The micro Hopkinson bar arrangement according to claim 5, wherein said clamp (27) comprises:
a first clamping column connected to the end of the incident rod (5), the first clamping column having a first half shaft (18) and a second half shaft (19) which are oppositely buckled; the buckling surfaces of the first half shaft (18) and the second half shaft (19) are provided with grooves along the axes thereof, and the test piece (26) is suitable for being connected in the grooves;
the second clamping column is connected to the end part of the transmission rod (6), and is provided with a third half shaft (20) and a fourth half shaft (21) which are oppositely buckled; the buckling surface of the third half shaft (20) and the fourth half shaft (21) is provided with a groove along the axis thereof, and the test piece (26) is suitable for being connected in the groove.
7. The micro-hopkinson brace apparatus of any one of claims 1 to 6, further comprising:
the environment box (10) is connected to the top end of the base (1) and arranged between the incident rod (5) and the transmission rod (6), and one end, suitable for being connected with the test piece (26), of the incident rod (5) and the transmission rod (6) extends into the environment box (10).
8. The micro Hopkinson bar device according to claim 7, wherein the side wall of the environmental chamber (10) is provided with a tuyere communicated with the inner cavity, and the tuyere is suitable for being communicated with a heating and humidifying device.
9. The micro Hopkinson bar means according to claim 7, wherein at least one side of said environmental chamber (10) is made of a transparent material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110089296.9A CN112730106A (en) | 2021-01-22 | 2021-01-22 | Miniature Hopkinson pull rod device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110089296.9A CN112730106A (en) | 2021-01-22 | 2021-01-22 | Miniature Hopkinson pull rod device |
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| Publication Number | Publication Date |
|---|---|
| CN112730106A true CN112730106A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110089296.9A Pending CN112730106A (en) | 2021-01-22 | 2021-01-22 | Miniature Hopkinson pull rod device |
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| Country | Link |
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| CN (1) | CN112730106A (en) |
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| US10481057B1 (en) * | 2016-12-01 | 2019-11-19 | National Technology & Engineering Solutions Of Sandia, Llc | Mechanical testing equipment for material characterization |
| CN108387464A (en) * | 2018-01-22 | 2018-08-10 | 北京理工大学 | A kind of double-deck miniature Hopkinson lever system of reluctance type tension and compression |
| RU2696359C1 (en) * | 2018-09-07 | 2019-08-01 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В. Ломоносова" (МГУ) | Kit for impact rods for experiments on dynamic shift |
| CN111337360A (en) * | 2020-04-20 | 2020-06-26 | 南京山河特种设备科技有限公司 | Double-rod separated Hopkinson pressure bar experimental device |
| CN111337361A (en) * | 2020-04-20 | 2020-06-26 | 南京山河特种设备科技有限公司 | Cluster type Hopkinson pressure bar experimental device |
| CN211955062U (en) * | 2020-04-20 | 2020-11-17 | 南京山河特种设备科技有限公司 | Cluster type Hopkinson pressure bar experimental device |
| CN214472446U (en) * | 2021-01-22 | 2021-10-22 | 泉州装备制造研究所 | Miniature Hopkinson pull rod device |
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