CN102830019A - Tensile synchronous experiment device - Google Patents
Tensile synchronous experiment device Download PDFInfo
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- CN102830019A CN102830019A CN2012103161364A CN201210316136A CN102830019A CN 102830019 A CN102830019 A CN 102830019A CN 2012103161364 A CN2012103161364 A CN 2012103161364A CN 201210316136 A CN201210316136 A CN 201210316136A CN 102830019 A CN102830019 A CN 102830019A
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Abstract
The invention discloses a tensile synchronous experiment device for solving the technical problem that the conventional tensile experiment device cannot be used for testing tensile performance of a material at high temperature and high strain rate. The technical scheme is that an end head of tensile test piece is designed to be in the form of a convex edge, wherein an end head of a pull rod connected to the tensile test piece is designed to be in the form of a wedged groove; and high-temperature synchronization is realized under the control of a linkage emission valve block through matching of the two end heads. By designing a connection mode of the end head of the tensile test piece and the end head of the pull rod, a reserved gap is arranged; the tensile test piece and the pull rod are heat-insulated through a heat insulating material, so that direct contact heat transfer of the tensile test piece and the pull rod is avoided during heating of the test piece; and thus, an incidence bar and a transmission bar are kept in a normal temperature state in an experimental process all the time, and the problem of increase in local temperature of the incidence bar and the transmission bar in the background technology is solved.
Description
Technical field
The present invention relates to a kind of experimental provision, particularly relate to the synchronous experimental provision of a kind of stretching.
Background technology
With reference to Fig. 1, Fig. 2, document " S.Nemat-Nasser, J.B.Isaacs; and J.E.Starrett, Hopkinson Techniques for DynamicRecovery Experiments, Proc.R.Soc. (London) A [J]; 435 (1991) 371-391 " and " S.Nemat-Nasser, Recovery Hopkinson Bar Techniques, Mechanical Test and Evaluation; Vol.8ASM Handbook; American Society for Metals, 2000, P.1068-1073 " a kind of tensile test device of material being realized the high strain rate tensile performance test is disclosed.This device comprises energy absorber 1, energy delivery bar 2, loading flange 3, impact tube 4, emission valve 5, impacts air chamber 6, incident bar 7, tensile sample 8 and transmission bar 9.Wherein energy absorber 1, energy delivery bar 2, impact air chamber 6, incident bar 7 and transmission bar 9 all are placed on the platform.Emission valve 5 is connected through tracheae with impact air chamber 6; Energy delivery bar 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is the tubulose quarter butt, is enclosed within on the incident bar 7, and can be free to slide along incident bar 7, and whole incident bar 7 runs through impact air chamber 6; Incident bar 7 is designed to transmit flange 3 with impact tube 4 colliding parts; All there is aperture in energy delivery bar 2 at axis part with transmission flange 3, in aperture, places one and is about the straight thin iron staff of 3cm, makes the two coaxial; Energy delivery bar 2, loading flange 3, impact tube 4, incident bar 7 and transmission bar 9 are to process (as all being that 18Ni is Ti perhaps) by same material.Tensile sample 8 two ends are threaded, and with incident bar 7 and transmission bar 9 through being threaded.Impact tube 4 is enclosed within on the incident bar 7, and can be free to slide along incident bar 7, and whole incident bar 7 runs through impact air chamber 6.
When carrying out stretching experiment, earlier with tensile sample 8 and incident bar 7 and transmission bar 9 through being threaded, again impact tube 4 is pushed impact air chamber 6.Be added to predetermined pressure through impact air chamber 6; At this moment open emission valve 5; Impact tube 4 can be pushed load to flange 3 at a high speed, loads flange 3 through bump and in incident bar 7, produces a tensile strain ripple, and this ripple is delivered to tensile sample 8 through incident bar 7 and tensile sample 8 is loaded; Through the strain wave pulse of incident bar 7 and transmission bar 9 is calculated, can obtain the dynamic stress strain curve of tensile sample 8.
The disclosed device of document can carry out the dynamic performance testing of material under the normal temperature (room temperature), but can not carry out the dynamic performance testing of material under the high temperature.Reason is: (1) is if directly increase temperature sample; Because tensile sample 8 directly is connected with incident bar 7 and transmission bar 9 through screw thread; The local temperature of the incident bar that is connected with sample 7 and transmission bar 9 is raise; Performances such as the elastic modulus that causes incident bar 7 and transmission bar 9 and intensity descend, and velocity of wave changes in the bar, can't accurately calculate tensile sample 8 dynamic stress strain curves through the strain wave pulse of incident bar 7 and transmission bar 9; (2) if select resistant to elevated temperatures incident bar 7 and transmission bar 9, because tensile sample 8 directly is connected with incident bar 7 and transmission bar 9 through screw thread, specimen temperature is very soon along the pole transmission, also very difficult sample increased temperature; (3) no matter select the incident bar 7 and transmission bar 9 of which kind of metal for use, its elastic modulus can descend rapidly after temperature surpasses about 250 ° of C.
Summary of the invention
For overcome existing tensile test device can not test material the problem of high-strain-rate tensile property at high temperature, the present invention provides a kind of stretching synchronous experimental provision.This device is designed to convex edge platform form with the termination of tensile sample; The termination of the pull bar that is connected with tensile sample is designed to the wedge-shaped slot form; The control that is engaged in interlock emission valve group through both realizes that high temperature is synchronous down, can realize the test to the high rate of strain performance of material at high temperature.
The technical solution adopted for the present invention to solve the technical problems is: the synchronous experimental provision of a kind of stretching; Comprise energy absorber 1, energy delivery bar 2, loading flange 3, impact tube 4, emission valve 5, impact air chamber 6, incident bar 7, tensile sample 8 and transmission bar 9, energy absorber 1, energy delivery bar 2, impact air chamber 6, incident bar 7 and transmission bar 9 all are placed on the platform.Emission valve 5 is connected through tracheae with impact air chamber 6; Energy delivery bar 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is the tubulose quarter butt, is enclosed within on the incident bar 7, and can be free to slide along incident bar 7, and whole incident bar 7 runs through impact air chamber 6; Incident bar 7 is designed to transmit flange 3 with impact tube 4 colliding parts; Energy delivery bar 2 all designs an aperture at axis part with transmitting flange 3, in aperture, places straight thin iron staff, makes the two coaxial.Be characterized in also comprising synchronous air chamber 10, piston 11, tracheae 12, high temperature furnace 13, draft cylinder 14, thermocouple wire 15, thermal insulation material 16.Emission valve 5 is made up of emission valve, impact air chamber valve and draft cylinder valve, and air chamber 10 is connected through tracheae 12 through emission valves 5 with draft cylinder 14 synchronously, and the piston 11 in the draft cylinder 14 is through the transmission bar 9 that is threaded.Incident bar 7 is connected the termination of tensile sample and designs a wedge-shaped slot with transmission bar 9; Tensile sample 8 two ends are designed to convex edge platform shape, remove crescent along diametric(al); Effective gauge length section is cylindrical in the middle of the two convex edge you heads.Both sides, tensile sample termination and wedge-shaped slot inwall are thermal insulation materials 16, and thermocouple wire 15 is strapped in the gauge length section of tensile sample 8, effective bringing-up section of high temperature furnace 13 be fixed on tensile sample 8 gauge length sections around.
The invention has the beneficial effects as follows: through design tensile sample and pull bar termination type of attachment; Preset clearance is set; And through thermal insulation material that tensile sample and pull bar is heat insulation, make when sample is heated, avoided the direct contact heat transfer of tensile sample and pull bar; Thereby in experimentation, make incident bar and the transmission bar to be in the normal temperature state all the time, overcome in the background technology problem that the local temperature of incident bar and transmission bar at high temperature can raise.
Below in conjunction with embodiment the present invention is elaborated.
Description of drawings
Fig. 1 is the synoptic diagram of background technology tensile test device.
Fig. 2 is the partial enlarged drawing of A part among Fig. 1.
Fig. 3 is the stretch synoptic diagram of synchronous experimental provision of the present invention.
Fig. 4 is the partial enlarged drawing of A part among Fig. 3.
Fig. 5 is the partial enlarged drawing of B part among Fig. 3.
Fig. 6 is the synoptic diagram of tensile sample among Fig. 4.
Among the figure, 1-energy absorber, 2-energy delivery bar, 3-load flange, 4-impact tube, 5-emission valve, 6-impact air chamber, 7-incident bar, 8-tensile sample, 9-transmission bar, the synchronous air chamber of 10-, 11-piston, 12-tracheae, 13-high temperature furnace, 14-synchro-draw cylinder, 15-thermocouple wire, 16-thermal insulation material, 17-gauge length section.
Embodiment
With reference to Fig. 3～6, the present invention stretches, and synchronous experimental provision comprises energy absorber 1, energy delivery bar 2, loading flange 3, impact tube 4, emission valve group 5, impact air chamber 6, incident bar 7, tensile sample 8, transmission bar 9, synchronous air chamber 10, piston 11, tracheae 12, high temperature furnace 13, draft cylinder 14, thermocouple wire 15, thermal insulation material 16 link.Energy absorber 1, energy delivery bar 2, impact air chamber 6, incident bar 7 and transmission bar 9 all are placed on the platform.Energy delivery bar 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is the tubulose quarter butt, is enclosed within on the incident bar 7, and can be free to slide along incident bar 7, and whole incident bar 7 runs through impact air chamber 6; Incident bar 7 is designed to transmit flange 3 with impact tube 4 colliding parts; All there is aperture in energy delivery bar 2 at axis part with transmission flange 3, in aperture, places one and is about the straight thin iron staff of 3cm, makes the two coaxial; Energy delivery bar 2, loading flange 3, impact tube 4, incident bar 7 and transmission bar 9 are to process (as all being that 18Ni is Ti perhaps) by same material.Emission valve 5 impacts the air chamber valve by the emission valve, and three valves of draft cylinder valve are formed, and emission valve and impact air chamber 6 are connected through tracheae; Can realize impact air chamber 6 and synchronous air chamber 10 independent pressurising and synchronized transmissions; Synchronously air chamber 10 is connected ventilation with draft cylinder 14 through interlock emission valve group 5 process tracheaes 12, spurs the piston rod in the draft cylinder 14, and then the transmission bar 9 that is connected with piston rod thread of pulling.Incident bar 7 is connected the termination of sample and designs a wedge-shaped slot with transmission bar 9; Tensile sample 8 terminations are designed to convex edge platform shape, remove crescent along diametric(al); Effective gauge length section 17 is cylindrical in the middle of the two convex edge you heads.The physical dimension of convex edge platform is less than the physical dimension of wedge-shaped slot, thereby the gap of 2mm to 3mm easily put into and left in the sample termination can along wedge-shaped slot, makes its integral body remain cylindrical just; Add the thermal insulation material 16 of 2mm in both sides, sample termination and wedge-shaped slot inwall, completely cut off the transmission of heat by contact of the two on the one hand, the sample termination is fixed in the wedge-shaped slot to 3mm.
During work: at first impact tube 4 is pushed and impact air chamber 6, with tensile sample 8 two ends convex edge platform and incident bar 7 and the assembling of transmission bar 9 wedge-shaped slot rod ends.Separate in diametric(al) with the inwall of thermal insulation material 16 during assembling tensile sample 8 two ends sidewalls and wedge-shaped slot rod end; Make it can not transmission of heat by contact; Tensile sample 8 two ends convex edge platform and wedge-shaped slot rod end stay about 3mm gap vertically; Guarantee that tensile sample 8 does not directly contact with transmission bar 9 with incident bar 7, then thermocouple wire 15 is bound to tensile sample 8 gauge length sections 17, move high temperature furnace 13 and make gauge length section 17 positions of the effective bringing-up section of stove at tensile sample 8.At this moment, impact air chamber 6 is stamped into the pressure 0.2Mpa that experiment needs, and synchronous air chamber 10 is pressurized to lucky gap-closing under the predefined pressure 0.06Mpa; When thermocouple wire 15 given temperature reach the temperature 1000K of experiment needs; Open interlock emission valve group 5 and make the high pressure gas of impacting in the air chamber 6 promote impact tube 4 to loading flange 3 motions, the air pressure of air chamber 10 enters into draft cylinder 14 along tracheae 12 synchronously simultaneously, makes piston 11 pulling transmission bar 9 fast; And then convex edge, tensile sample 8 two ends platform is closely contacted with transmission bar 9 rod end wedge-shaped slots with incident bar 7; At this moment, load the stretching ripple and just in time arrive tensile sample 8, tensile sample 8 is loaded; Through incident bar 7 and transmission bar 9 strain waves are calculated, can obtain the stress-strain diagram of tensile sample 8.This device has guaranteed incident bar 7 and transmission bar 9 at low temperatures, only tensile sample is applied high temperature, accurately and reliably material is carried out the high rate of strain coupling performance test of high temperature.
Claims (1)
1. synchronous experimental provision that stretches; Comprise energy absorber (1), energy delivery bar (2), loading flange (3), impact tube (4), emission valve (5), impact air chamber (6), incident bar (7), tensile sample (8) and transmission bar (9), energy absorber (1), energy delivery bar (2), impact air chamber (6), incident bar (7) and transmission bar (9) all are placed on the platform; Emission valve (5) is connected through tracheae with impact air chamber (6); Energy delivery bar (2), incident bar (7), transmission bar (9), be cylindrical bar; Impact tube (4) is the tubulose quarter butt, is enclosed within on the incident bar (7), and can be free to slide along incident bar (7), and whole incident bar (7) runs through impact air chamber (6); Incident bar (7) is fixed with loading flange (3) with an end of impact tube (4) collision; Energy delivery bar (2) all designs an aperture at axis part with transmitting flange (3), in aperture, places straight thin iron staff, makes the two coaxial; It is characterized in that: also comprise synchronous air chamber (10), piston (11), tracheae (12), high temperature furnace (13), draft cylinder (14), thermocouple wire (15), thermal insulation material (16); Emission valve (5) is made up of emission valve, impact air chamber valve and draft cylinder valve; Air chamber (10) is connected through tracheae (12) through emission valve (5) with draft cylinder (14) synchronously, and the piston (11) in the draft cylinder (14) is through the transmission bar that is threaded (9); Incident bar (7) designs a wedge-shaped slot with the termination that transmission bar (9) is connected tensile sample; Tensile sample (8) two ends is designed to convex edge platform shape, removes crescent along diametric(al); Effective gauge length section (17) is cylindrical in the middle of the two convex edge you heads; Both sides, tensile sample termination and wedge-shaped slot inwall are thermal insulation material (16), and thermocouple wire (15) is strapped in the gauge length section (17) of tensile sample (8), effective bringing-up section of high temperature furnace (13) be fixed on tensile sample (8) gauge length section (17) around.
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| CN201210316136.4A CN102830019B (en) | 2011-12-18 | 2012-08-30 | Tensile synchronous experiment device |
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| CN201210316136.4A CN102830019B (en) | 2011-12-18 | 2012-08-30 | Tensile synchronous experiment device |
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Cited By (10)
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| CN104155166A (en) * | 2014-08-29 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Preparation and determination method of sample for compression of metal material with high thermal conductivity |
| CN104280294A (en) * | 2014-10-15 | 2015-01-14 | 北京航空航天大学 | Dynamic temperature measuring device in high-temperature breaking strength tensile test |
| CN104677724A (en) * | 2015-02-13 | 2015-06-03 | 洛阳利维科技有限公司 | Sealing device for piston in pneumatic type Hopkinson equipment emitting device |
| CN105067449A (en) * | 2015-08-01 | 2015-11-18 | 中国人民解放军国防科学技术大学 | Heat insulation apparatus capable of transmitting tension and pressure |
| CN106248496A (en) * | 2016-07-20 | 2016-12-21 | 西北工业大学 | Reciprocating double synchronization package systems based on Hopkinson depression bar |
| CN107543751A (en) * | 2017-09-21 | 2018-01-05 | 宁波大学 | A kind of material large deformation tensile impact experimental method |
| CN107884271A (en) * | 2017-11-15 | 2018-04-06 | 河南理工大学 | Drawing converter and punching drawing test method are rushed in rock dynamic direct tensile test |
| CN110082204A (en) * | 2019-04-24 | 2019-08-02 | 西北工业大学 | A kind of twin shaft Hopkinson bar high strain rate tensile device and test method |
| CN110196198A (en) * | 2019-05-16 | 2019-09-03 | 西北工业大学 | Can accurate quantification Electromagnetic Control high temperature Hopkinson bar tensile test apparatus and method |
| CN113533200A (en) * | 2021-09-15 | 2021-10-22 | 南通苏派义齿有限公司 | Strength testing equipment for accurate guiding and stretching of dental binder |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155166A (en) * | 2014-08-29 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Preparation and determination method of sample for compression of metal material with high thermal conductivity |
| CN104280294A (en) * | 2014-10-15 | 2015-01-14 | 北京航空航天大学 | Dynamic temperature measuring device in high-temperature breaking strength tensile test |
| CN104677724A (en) * | 2015-02-13 | 2015-06-03 | 洛阳利维科技有限公司 | Sealing device for piston in pneumatic type Hopkinson equipment emitting device |
| CN104677724B (en) * | 2015-02-13 | 2017-07-04 | 洛阳利维科技有限公司 | The sealing ring of piston in a kind of pneumatic type Hopkinson equipment emitter |
| CN105067449A (en) * | 2015-08-01 | 2015-11-18 | 中国人民解放军国防科学技术大学 | Heat insulation apparatus capable of transmitting tension and pressure |
| CN105067449B (en) * | 2015-08-01 | 2017-12-05 | 中国人民解放军国防科学技术大学 | It is a kind of to transmit pulling force and the heat-proof device of pressure |
| CN106248496A (en) * | 2016-07-20 | 2016-12-21 | 西北工业大学 | Reciprocating double synchronization package systems based on Hopkinson depression bar |
| CN106248496B (en) * | 2016-07-20 | 2019-02-26 | 西北工业大学 | Reciprocating double synchronous package systems based on Hopkinson compression bar |
| CN107543751B (en) * | 2017-09-21 | 2019-08-06 | 宁波大学 | A kind of material large deformation tensile impact experimental method |
| CN107543751A (en) * | 2017-09-21 | 2018-01-05 | 宁波大学 | A kind of material large deformation tensile impact experimental method |
| CN107884271A (en) * | 2017-11-15 | 2018-04-06 | 河南理工大学 | Drawing converter and punching drawing test method are rushed in rock dynamic direct tensile test |
| CN107884271B (en) * | 2017-11-15 | 2023-09-12 | 河南理工大学 | Impact-pulling converter for rock dynamic direct tensile test and impact-pulling test method |
| CN110082204A (en) * | 2019-04-24 | 2019-08-02 | 西北工业大学 | A kind of twin shaft Hopkinson bar high strain rate tensile device and test method |
| CN110082204B (en) * | 2019-04-24 | 2021-10-12 | 西北工业大学 | Biaxial Hopkinson rod high strain rate stretching device and test method |
| CN110196198A (en) * | 2019-05-16 | 2019-09-03 | 西北工业大学 | Can accurate quantification Electromagnetic Control high temperature Hopkinson bar tensile test apparatus and method |
| CN110196198B (en) * | 2019-05-16 | 2022-05-10 | 西北工业大学 | High-temperature Hopkinson rod tensile test device and method capable of accurately quantifying electromagnetic control |
| CN113533200A (en) * | 2021-09-15 | 2021-10-22 | 南通苏派义齿有限公司 | Strength testing equipment for accurate guiding and stretching of dental binder |
| CN113533200B (en) * | 2021-09-15 | 2021-11-16 | 南通苏派义齿有限公司 | Strength testing equipment for accurate guiding and stretching of dental binder |
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