CN109187166A - A kind of Hopkinson pressure bar rod end protective device - Google Patents
A kind of Hopkinson pressure bar rod end protective device Download PDFInfo
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- CN109187166A CN109187166A CN201811027257.0A CN201811027257A CN109187166A CN 109187166 A CN109187166 A CN 109187166A CN 201811027257 A CN201811027257 A CN 201811027257A CN 109187166 A CN109187166 A CN 109187166A
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- positioning sleeve
- cushion block
- round table
- diameter
- rod end
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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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to In Dynamic Testing of Materials equipment technical fields, and in particular to a kind of Hopkinson pressure bar rod end protective device；Positioning sleeve including being set in incident boom end, the positioning sleeve are the hollow tubular structures of large and small diameter segment, and the inner hole of reduced diameter section is round table-like；The self-positioning set of incident bar enlarged diameter section nozzle insertion simultaneously with the larger diameter end for the round table-like cushion block being plugged in positioning sleeve by grease it is closely sealed, the smaller diameter end of round table-like cushion block protrude out the reduced diameter section nozzle of positioning sleeve and with one end of test specimen by grease it is closely sealed；Lean to one side and the reduced diameter section tube wall of positioning sleeve of the round table-like cushion block, which constitute limit cooperation, makes the half of its thickness protrude out the reduced diameter section nozzle of positioning sleeve；Hopkinson pressure bar rod end protective device provided by the invention can make rod end be hit and will not be destroyed infinitely, substantially increase the utilization rate and test accuracy of equipment for protecting the rod end of Hopkinson bar.
Description
Technical field
The invention belongs to In Dynamic Testing of Materials equipment technical fields, and in particular to a kind of Hopkinson pressure bar bar
Hold protective device.
Background technique
Split hopkinson press bar be it is a kind of research one-dimensional stress state under MATERIALS ' DYNAMIC Compressive Mechanical Properties it is effective
Experimental provision.It has at home and abroad been had been widely used since 1949.Associated dynamic compression test enters to test specimen contact
The flatness, the depth of parallelism and verticality for penetrating the end face of bar and transmission bar have very high requirement.It is wanted even if machining accuracy is able to satisfy
It asks, but in use, flatness, the depth of parallelism and the verticality of end face are often destroyed.At present existing method be
In rod end surface plus a cushion block is to protect rod end surface, but since end face cannot be fixed on rod end (only pasting by grease).Work as incidence
Meeting a part is transmitted in test specimen when wave reaches cushion block and test specimen for the first time, and a part is reflected back incident bar.When the wave resistance of test specimen
When the anti-wave impedance for being less than incident bar (overwhelming majority belongs to situation), compressional wave is reflected into stretching on incident bar and test specimen interface
Wave, since tensile stress cannot be born between incident bar and cushion block, so cushion block is under action of pulling stress, it is de- with incident rod end
From, under the effect of gravity, cushion block gradually falls, no longer with rod end is close matches, had dislocation.On the other hand, when back wave reach into
The loading end of bar is penetrated, and is reflected into compressional wave in rod end (rod end surface is the scope of freedom) again, and propagate to test specimen end.When the wave arrives
Rod end surface compresses cushion block when up to cushion block, due to cushion block no longer with rod end is close matches, misplaced, when compression cause rod end surface part by
Power causes rod end to generate pit, destroys the flatness of rod end surface, the depth of parallelism.Over time, rod end surface is badly damaged, seriously
Influence experimental precision.Since bar is general long (several meters), the rare lathe that can accurately process its end face, and from laboratory from adding
Factory's quotient's transport difficult.
Summary of the invention
The purpose of the present invention is to provide a kind of Hopkinson pressure bar rod end protective devices, to solve in above-mentioned background technique
The technical issues of referring to.
To achieve the goals above, the present invention is achieved by the following scheme:
A kind of Hopkinson pressure bar rod end protective device, the positioning sleeve including being set in incident boom end, the positioning
Set is the hollow tubular structures of large and small diameter segment, and the inner hole of reduced diameter section is round table-like；
The enlarged diameter section nozzle of the self-positioning set of incident bar is inserted into and big straight with the round table-like cushion block that is plugged in positioning sleeve
Diameter end is closely sealed by grease, and the smaller diameter end of round table-like cushion block protrudes out the reduced diameter section nozzle of positioning sleeve and one end with test specimen
It is closely sealed by grease；
The side of the round table-like cushion block and the reduced diameter section tube wall of positioning sleeve, which constitute limit cooperation, makes the half of its thickness
Protrude out the reduced diameter section nozzle of positioning sleeve.
Preferably, the larger diameter end diameter of the round table-like cushion block is slightly less than the enlarged diameter section internal diameter of positioning sleeve, and is greater than
The reduced diameter section internal diameter of positioning sleeve；
The smaller diameter end diameter of round table-like cushion block is less than the reduced diameter section internal diameter of positioning sleeve and identical as the bar diameter of incident bar.
Preferably, the other end of test specimen has been arranged symmetrically the second round table-like cushion block and the second positioning sleeve, the second round table-like pad
The larger diameter end of block and the rod end of transmission bar are closely sealed by grease, the smaller diameter end of the second round table-like cushion block and the other end of test specimen
It is closely sealed by grease.
Compared with prior art, the present invention has following technical effect that
Hopkinson pressure bar rod end protective device provided by the invention, for protecting the rod end of Hopkinson bar (including to enter
Penetrate the loading end of bar, incident bar and test specimen contact jaw, transmission bar and test specimen contact jaw)；Can make rod end through infinitely hit and
It will not destroy, substantially increase the utilization rate and test accuracy of equipment.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment.
Detailed description of the invention
Fig. 1 is the schematic diagram of Hopkinson pressure bar rod end protective device provided by the invention；
Fig. 2 is the cross-sectional view of positioning sleeve；
Figure label explanation: 1- test specimen, 10- incident bar, 20- positioning sleeve, 21- reduced diameter section, 22- enlarged diameter section, 30- circle
Mesa-shaped cushion block, the round table-like cushion block of 40- second, the second positioning sleeve of 50-, 60- transmission bar.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific attached drawing is closed, the present invention is furture elucidated.
In conjunction with shown in Fig. 1,2, the present invention provides a kind of Hopkinson pressure bar rod end protective devices, including are set in incidence
The positioning sleeve 20 of 10 end of bar, the positioning sleeve 20 be large and small diameter segment hollow tubular structures, reduced diameter section 21 it is interior
Hole is round table-like；
22 nozzle of enlarged diameter section of the self-positioning set 20 of incident bar 10 be inserted into and with the round table-like pad that is plugged in positioning sleeve 20
The larger diameter end of block 30 is closely sealed by grease, and the reduced diameter section 21 that the smaller diameter end of round table-like cushion block 30 protrudes out positioning sleeve 20 is managed
Mouth is simultaneously closely sealed by grease with one end of test specimen 1；
The side of the round table-like cushion block 30 and 21 tube wall of reduced diameter section of positioning sleeve 20, which constitute limit cooperation, makes its thickness
Half protrude out the reduced diameter section nozzle of positioning sleeve 20.
During specific test, trip rod hits 10 loading end of incident bar, actually impinges upon round table-like cushion block 30
On, protect the rod end of incident bar 10.Load wave is transmitted to test specimen 1 in incident bar 10, and stretching is reflected to form at test specimen 1
Wave, under the action of tensile wave, round table-like cushion block 30 leaves 10 end face of incident bar, but move behind certain distance gap with positioning sleeve
20 inner surfaces will move forward together to cooperation with positioning sleeve 20, and positioning sleeve 20 can play certain positioning action, guarantee circle
Mesa-shaped cushion block 30 does not slide and keeps original state, in this way, guaranteeing when incident bar 10 hits round table-like cushion block 30 again normal
Hit state, and will not rod end surface and round table-like 30 end face of cushion block damage.
According to the present invention, the larger diameter end diameter of the round table-like cushion block 30 is slightly less than in the enlarged diameter section 22 of positioning sleeve 20
Diameter, and it is greater than 21 internal diameter of reduced diameter section of positioning sleeve 20；
The smaller diameter end diameter of round table-like cushion block 30 be less than positioning sleeve 20 21 internal diameter of reduced diameter section and with incident bar 10
Bar diameter is identical.
In the present invention, the length of the positioning sleeve 20 is typically no less than 200mm, to guarantee that it does not take off along bar motion process
It falls；The material of round table-like cushion block 30 is identical as the material of incident bar 10, and hardness may be slightly larger than the material of incident bar 10, round table-like
The both ends of the surface of cushion block 30 have the very high depth of parallelism, flatness.Incident bar 10, round table-like cushion block 30, positioning sleeve 20 are along incident bar
10 axial line arrangement.
Further, according to the present invention, the other end of test specimen 1 has been arranged symmetrically the second round table-like cushion block 40 and the second positioning
Set 50, the larger diameter end of the second round table-like cushion block 40 and the rod end of transmission bar 60 closely sealed, the second round table-like cushion block 40 by grease
Smaller diameter end and test specimen 1 the other end by grease it is closely sealed.In the shock of 60 rod end of transmission bar and the second round table-like cushion block 40
Process and 10 rod end of incident bar are similar to the knockout process of round table-like cushion block 30, also just protect the rod end of transmission bar 60 in this way
Face.
The present invention thoroughly solves the problems, such as that rod end surface is impaired in the prior art, substantially prolongs the service life of equipment,
Improve experimental precision.
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (3)
1. a kind of Hopkinson pressure bar rod end protective device, it is characterised in that: the positioning including being set in incident bar (10) end
It covers (20), the positioning sleeve (20) is the hollow tubular structures of large and small diameter segment, and the inner hole of reduced diameter section (21) is rotary table
Shape；
Enlarged diameter section (22) nozzle of incident bar (10) self-positioning set (20) be inserted into and with the rotary table that is plugged in positioning sleeve (20)
The larger diameter end of shape cushion block (30) is closely sealed by grease, and the smaller diameter end of round table-like cushion block (30) protrudes out the small of positioning sleeve (20)
Diameter segment (21) nozzle is simultaneously closely sealed by grease with one end of test specimen (1)；
The side of the round table-like cushion block (30) and reduced diameter section (21) tube wall of positioning sleeve (20), which constitute limit cooperation, makes its thickness
The half of degree protrudes out the reduced diameter section nozzle of positioning sleeve (20).
2. Hopkinson pressure bar rod end protective device according to claim 1, it is characterised in that: the round table-like cushion block
(30) larger diameter end diameter is slightly less than enlarged diameter section (22) internal diameter of positioning sleeve (20), and is greater than the minor diameter of positioning sleeve (20)
Section (21) internal diameter；
The smaller diameter end diameter of round table-like cushion block (30) is less than reduced diameter section (21) internal diameter of positioning sleeve (20) and and incident bar
(10) bar diameter is identical.
3. Hopkinson pressure bar rod end protective device according to claim 1, it is characterised in that: the other end of test specimen (1)
The second round table-like cushion block (40) and the second positioning sleeve (50) have been arranged symmetrically it, the larger diameter end of the second round table-like cushion block (40) and thoroughly
The rod end for penetrating bar (60) is closely sealed by grease, and the smaller diameter end of the second round table-like cushion block (40) and the other end of test specimen (1) pass through
Grease is closely sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811027257.0A CN109187166A (en) | 2018-09-04 | 2018-09-04 | A kind of Hopkinson pressure bar rod end protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811027257.0A CN109187166A (en) | 2018-09-04 | 2018-09-04 | A kind of Hopkinson pressure bar rod end protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109187166A true CN109187166A (en) | 2019-01-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811027257.0A Pending CN109187166A (en) | 2018-09-04 | 2018-09-04 | A kind of Hopkinson pressure bar rod end protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109187166A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057690A (en) * | 2019-05-09 | 2019-07-26 | 福州大学 | Hopkinson bar concrete material dual shear test device and its application method |
| CN110261252A (en) * | 2019-06-14 | 2019-09-20 | 武汉理工大学 | Hopkinson pressure bar experiment transmission bar and Hopkinson pressure bar experiment device |
| CN113447374A (en) * | 2021-07-12 | 2021-09-28 | 中物院成都科学技术发展中心 | End face stress concentration eliminating device, test method and system |
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2018
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| CN103091159A (en) * | 2013-02-05 | 2013-05-08 | 中国人民解放军陆军军官学院 | Novel split Hopkinson pull bar apparatus |
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| US20160178496A1 (en) * | 2014-12-22 | 2016-06-23 | Rolls-Royce Plc | Output member |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057690A (en) * | 2019-05-09 | 2019-07-26 | 福州大学 | Hopkinson bar concrete material dual shear test device and its application method |
| CN110261252A (en) * | 2019-06-14 | 2019-09-20 | 武汉理工大学 | Hopkinson pressure bar experiment transmission bar and Hopkinson pressure bar experiment device |
| CN110261252B (en) * | 2019-06-14 | 2021-09-03 | 武汉理工大学 | Transmission rod for Hopkinson pressure bar experiment and Hopkinson pressure bar experiment device |
| CN113447374A (en) * | 2021-07-12 | 2021-09-28 | 中物院成都科学技术发展中心 | End face stress concentration eliminating device, test method and system |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| CB02 | Change of applicant information |
Address after: 230000 the intersection of Shui Yangjiang road and Ningguo road in Baohe District, Hefei, Anhui, No. 220, Hefei National University Science Park. Applicant after: Hefei Ginger Hydraulic Dynamics Experimental Technology Co.,Ltd. Address before: 230000 the intersection of Shui Yangjiang road and Ningguo road in Baohe District, Hefei, Anhui, No. 220, Hefei National University Science Park. Applicant before: HEFEI JIANGSHUI CAIXING TECHNOLOGY CO.,LTD. |
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Application publication date: 20190111 |