CN104034589B - Hopkinson pull rod discharger - Google Patents
Hopkinson pull rod discharger Download PDFInfo
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- CN104034589B CN104034589B CN201410208218.6A CN201410208218A CN104034589B CN 104034589 B CN104034589 B CN 104034589B CN 201410208218 A CN201410208218 A CN 201410208218A CN 104034589 B CN104034589 B CN 104034589B
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- gun tube
- sleeve
- bullet
- piston
- stretching
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Abstract
The invention discloses a kind of Hopkinson pull rod discharger, including stretching gun tube, straight-line ball guide pin bushing, transfer block, tubulose bullet, magnetic steel ring, sleeve, gun tube base, piston and incident bar；Existing discharger is improved the requirement adapting to different experiments to bar footpath by the present invention, and the purpose of mounting magnetic steel circle is to eliminate the rigid shock between piston and gun tube, thus avoiding owing to clashing into the impact producing high-frequency signal for signal acquisition.
Description
Technical field
The invention belongs to material mechanical performance experiment field, particularly a kind of Hopkinson pull rod discharger.
Background technology
At present for the research of Hopkinson pull rod and use, much it is intended in eliminating high-frequency signal affecting and reducing dynamical system energy loss in providing dynamic process as far as possible for device.High-frequency signal may be from experimental situation, also may be from experimental provision itself；The interference of experimental situation is uncertain at random, but for improving experimental provision thus reducing the interference to experiment and can realizing.Be currently used on Hopkinson pull rod discharger realizing promoting the relatively simple structure of bullet motion is that piston promotes, when piston promotes bullet accelerator to need piston is slowed down after terminating.In general device as, " a kind of discharger based on Hopkinson pull rod assay device " such as designs such as Mr. Zhang send out adopts the materials such as rubber blanket or hydraulic bjuffer to prevent piston and gun tube generation hard contact, but owing to deceleration distance is short, above-mentioned ways of deceleration still can not be completely eliminated owing to clashing into the interference signal produced, so proposing a kind of structure simply and effectively preventing from clashing into by necessary.
Hopkinson pressure bar is improved for can more convenient research material assay device of this structure and component failure under high strain-rate simultaneously, so the improvement for experimental provision should both meet the one-dimension and uniformity that ripple is propagated in bar, meet certain radial dimension requirement again.Generally, this structure for material is studied, and test club diameter is more little, and test specimen diameter is also more little, and relative stress will be more uniform, also saves test specimen and test club material simultaneously.But some experiments need to adopt big bar footpath Hopkinson bar, Hopkinson pressure bar research double; two bonding testing piece stress under high strain-rate and unsticking form is used such as document " GeorgesChallita; RamziOthman:Finite-elementanalysisofSHPBtestsondouble-la padhesivejoints.InternationalJournalofAdhesionandAdhesiv es.30 (4); 236-244 (2010) ", so that bonding testing piece end uniform force, otherwise very high for the processing request of bonding testing piece；If using small pole diameter test club to test, experimental precision can be greatly affected.Document " Li Jicheng; CHEN XIAOWEI; Chen Gang: 921A steel pure shear hat shaped specimen dynamic deformation in SHPB tests. blast and impact .V30; 2010 " use 25mmSHPB that the shearing stress of material has been studied, but this study limitation is in intermetallic composite coating and experiment, if adopting viscoelastic material or viscous super elastic material, can make processing difficulties and experimental result due to the reason of relative shape become inaccurate.Big bar footpath Hopkinson bar is used to make moderate progress in this case.
Summary of the invention
It is an object of the invention to provide a kind of capacity of resisting disturbance higher, and the Hopkinson pull rod discharger in replaceable different experiments bar footpath.
The technical solution realizing the object of the invention is:
nullA kind of Hopkinson pull rod discharger，Including stretching gun tube、Straight-line ball guide pin bushing、Transfer block、Tubulose bullet、Magnetic steel ring、Sleeve、Gun tube base、Piston and incident bar，Stretch gun tube to be fixedly installed on gun tube base，The screwed sleeve in one end runs through stretching gun tube and is threadedly attached in the air inlet end cap stretching gun tube，Piston bush with centre bore is one end of the close air inlet stretching gun tube on sleeve，Piston does not contact with sleeve，O RunddichtringO is set between the two，And coordinate with stretching gun tube internal surface gaps，Tubulose bullet is slidably socketed on sleeve，The internal diameter of tubulose bullet is more than the external diameter of sleeve，And one end and piston contact，Two magnetic steel rings are separately positioned on the bullet outlet end cap inwall stretching gun tube and the end face of the nearly bullet outlet of piston，And both positions are corresponding，Straight-line ball guide pin bushing is arranged on the nearly bullet port of export of sleeve lining by transfer block，Incident bar runs through whole discharger，And with straight-line ball guide pin bushing inwall matched in clearance，The ring flange end of incident bar is arranged on the nearly bullet port of export.
The present invention compared with prior art, its remarkable advantage:
(1) present invention can pass through to change straight-line ball guide pin bushing and transfer block to allow the incident bar by different bar footpaths, thus adapting to the different experiments requirement to bar footpath.
(2) present invention uses simple magnetic steel ring structure to achieve the non-rigid shock moderating process promoting bullet to accelerate back piston, thus completely eliminating owing to non-test club clashes into the high-frequency signal interference caused.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of Hopkinson pull rod discharger of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1 of Hopkinson pull rod discharger of the present invention.
Detailed description of the invention
nullOne Hopkinson pull rod discharger of the present invention，Including stretching gun tube 1、Straight-line ball guide pin bushing 2、Transfer block 3、Tubulose bullet 4、Magnetic steel ring 5、Sleeve 6、Gun tube base 7、Piston 8 and incident bar 9，Stretch gun tube 1 to be fixedly installed on gun tube base 7，The screwed sleeve 6 in one end runs through stretching gun tube 1 and is threadedly attached in the air inlet end cap stretching gun tube 1，Piston 8 with centre bore is enclosed within sleeve 6 near the one end of the air inlet stretching gun tube 1，Piston 8 does not contact with sleeve 6，O RunddichtringO is set between the two，And coordinate with stretching gun tube 1 internal surface gaps，Tubulose bullet 4 is slidably socketed on sleeve 6，The internal diameter of tubulose bullet 4 is more than the external diameter of sleeve 6，And one end contacts with piston 8，Two magnetic steel rings 5 are separately positioned on the bullet outlet end cap inwall stretching gun tube 1 and the end face of the nearly bullet outlet of piston 8，And both positions are corresponding，Straight-line ball guide pin bushing 2 is arranged on the nearly bullet port of export of sleeve 6 inwall by transfer block 3，Incident bar 9 runs through whole discharger，And with straight-line ball guide pin bushing 2 inwall matched in clearance，The ring flange end of incident bar 9 is arranged on the nearly bullet port of export.
Transfer block 3 is fixed on the nearly bullet port of export of sleeve 6 inwall by snap ring, and straight-line ball guide pin bushing 2 is fixed on transfer block 3 inwall by snap ring.
Tubulose bullet 4 is slidably socketed on sleeve 6, owing to the area of contact is relatively big, therefore designs the internal diameter external diameter more than sleeve 6 of tubulose bullet 4, and tubulose bullet 4 hangs on sleeve 6, reduces frictional force, meets slip requirement；And incident bar 9 is less with the contact area of straight-line ball guide pin bushing 2, thereby ensure that bigger matched in clearance can meet slip requirement.
In the accompanying drawings, after the assembling of modified model Hopkinson pull rod discharger, gun tube base 7 is arranged on horizontal stand.The detailed description of the invention of stretching experiment is described below:
Use tubulose bullet 4 that the piston 8 with centre bore is shifted onto the inlet end stretching gun tube 1 before stretching experiment, make the piston 8 with centre bore contact with stretching gun tube 1 air inlet end cap.Opening cylinder makes gas enter stretching gun tube 1, gas push piston 8, and piston 8 promotes tubulose bullet 4 to be accelerated and finally penetrates from stretching gun tube 1.Tubulose bullet 4 clashes into the ring flange of incident bar 9 near one end generation compressional wave stretching gun tube 1 subsequently, and compressional wave reflects to form tensile wave at the ring flange other end, and data collecting card collects the voltage signal that on incident bar 9, foil gauge produces.
Promoting in the process of bullet 4 at gas push piston 8, piston 8, the active force between two magnetic steel rings 5 is gradually increased, and when the pressure that this power produces more than gas, piston 8 reduces speed now after completing the acceleration to tubulose bullet 4.Zero and adverse movement is reduced to back piston 8 speed；After again reducing to zero, adverse movement；So repeatedly until stopping.The gas stretched in gun tube 1 is released by gap between part gradually.
When needs carry out different bar footpath experiment, first incident bar 9 is taken out, take out transfer block 3 and straight-line ball guide pin bushing 2, the transfer block 3 in test club footpath, straight-line ball guide pin bushing 2 and incident bar 9 needed for fit on subsequently from sleeve 6 inwall.
Claims (2)
- null1. a Hopkinson pull rod discharger，Including stretching gun tube (1)、Tubulose bullet (4)、Piston (8) and incident bar (9)，Tubulose bullet (4) one end contacts with piston (8)，Incident bar (9) runs through whole discharger，The ring flange end of incident bar (9) is arranged on the nearly bullet port of export，It is characterized in that: device also includes straight-line ball guide pin bushing (2)、Transfer block (3)、Magnetic steel ring (5)、Sleeve (6) and gun tube base (7)，Stretch gun tube (1) to be fixedly installed on gun tube base (7)，The screwed sleeve in one end (6) is run through stretching gun tube (1) and is threadedly attached in the air inlet end cap stretching gun tube (1)，Piston (8) with centre bore is enclosed within the upper one end near the air inlet stretching gun tube (1) of sleeve (6)，Piston (8) does not contact with sleeve (6)，O RunddichtringO is set between the two，And coordinate with stretching gun tube (1) internal surface gaps，Tubulose bullet (4) is slidably socketed on sleeve (6)，The internal diameter of tubulose bullet (4) is more than the external diameter of sleeve (6)，Two magnetic steel rings (5) are separately positioned on the bullet outlet end cap inwall stretching gun tube (1) and the end face of the nearly bullet outlet of piston (8)，And both positions are corresponding，Straight-line ball guide pin bushing (2) is arranged on the nearly bullet port of export of sleeve (6) inwall by transfer block (3)，Incident bar (9) and straight-line ball guide pin bushing (2) inwall matched in clearance.
- 2. Hopkinson pull rod discharger according to claim 1, it is characterized in that: described transfer block (3) is fixed on the nearly bullet port of export of sleeve (6) inwall by snap ring, and straight-line ball guide pin bushing (2) is fixed on transfer block (3) inwall by snap ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410208218.6A CN104034589B (en) | 2014-05-16 | 2014-05-16 | Hopkinson pull rod discharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410208218.6A CN104034589B (en) | 2014-05-16 | 2014-05-16 | Hopkinson pull rod discharger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104034589A CN104034589A (en) | 2014-09-10 |
| CN104034589B true CN104034589B (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410208218.6A Expired - Fee Related CN104034589B (en) | 2014-05-16 | 2014-05-16 | Hopkinson pull rod discharger |
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| Country | Link |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458454A (en) * | 2014-12-02 | 2015-03-25 | 南京理工大学 | Improved emitting device of Hopkinson pull rod |
| CN104483185A (en) * | 2014-12-22 | 2015-04-01 | 齐鲁工业大学 | Novel SHPB (split Hopkinson pressure bar) explosive power source device |
| CN104614230A (en) * | 2015-01-28 | 2015-05-13 | 南京理工大学 | Improved firing device of split Hopkinson torsion bar |
| CN105973731A (en) * | 2016-07-07 | 2016-09-28 | 西南交通大学 | SHTB (Split Hopkinson Tension Bar) device capable of eliminating pre-motion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247180Y (en) * | 2008-08-13 | 2009-05-27 | 西北工业大学 | Air valve device for tensile loading |
| PT104167A (en) * | 2008-09-03 | 2010-03-03 | Inst Superior Tecnico | HOPKINSON TESTING MACHINE FOR ELECTROMAGNETIC IMPULSION |
| CN103076223A (en) * | 2012-12-30 | 2013-05-01 | 南京理工大学 | Launcher based on Hopkinson pull rod test equipment |
-
2014
- 2014-05-16 CN CN201410208218.6A patent/CN104034589B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247180Y (en) * | 2008-08-13 | 2009-05-27 | 西北工业大学 | Air valve device for tensile loading |
| PT104167A (en) * | 2008-09-03 | 2010-03-03 | Inst Superior Tecnico | HOPKINSON TESTING MACHINE FOR ELECTROMAGNETIC IMPULSION |
| CN103076223A (en) * | 2012-12-30 | 2013-05-01 | 南京理工大学 | Launcher based on Hopkinson pull rod test equipment |
Non-Patent Citations (2)
| Title |
|---|
| Finite-element analysis of SHPB tests on double-lap adhesive joints;Challita, Georges et al.;《INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES》;20100630;第30卷(第4期);236-244 * |
| 基于显式算法的改进型SHTB实验模型研究;张君发 等;《计算机工程与设计》;20140228;第35卷(第2期);593-597 * |
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|---|---|
| CN104034589A (en) | 2014-09-10 |
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Granted publication date: 20160706 Termination date: 20180516 |