CN102830019B - Tensile synchronous experiment device - Google Patents
Tensile synchronous experiment device Download PDFInfo
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- CN102830019B CN102830019B CN201210316136.4A CN201210316136A CN102830019B CN 102830019 B CN102830019 B CN 102830019B CN 201210316136 A CN201210316136 A CN 201210316136A CN 102830019 B CN102830019 B CN 102830019B
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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 a kind of stretching synchronous experimental facility.
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 to high strain rate tensile performance test is disclosed.This device comprises energy absorber 1, energy transmission lever 2, loading flange 3, impact tube 4, transmitting valve 5, impacts air chamber 6, incident bar 7, tensile sample 8 and transmission bar 9.Wherein energy absorber 1, energy transmission lever 2, impact air chamber 6, incident bar 7 and transmission bar 9 are all placed on platform.Transmitting valve 5 is connected by tracheae with impact air chamber 6; Energy transmission lever 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is tubulose quarter butt, is enclosed within on 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 at axis part with transmitting flange 3 in energy transmission lever 2, places one and be about the straight thin iron staff of 3cm in aperture, makes the two coaxial; Energy transmission lever 2, to load flange 3, impact tube 4, incident bar 7 and transmission bar 9 be to process (as being all 18Ni or being all Ti) by same material.Tensile sample 8 two ends are threaded, and are threaded connection with incident bar 7 and transmission bar 9.Impact tube 4 is enclosed within on incident bar 7, and can be free to slide along incident bar 7, and whole incident bar 7 runs through impact air chamber 6.
While carrying out stretching experiment, first tensile sample 8 and incident bar 7 and transmission bar 9 are threaded connection, then impact tube 4 is pushed and impacts air chamber 6.By impact air chamber 6, be added to predetermined pressure, at this moment open transmitting valve 5, impact tube 4 can be pushed at a high speed load to flange 3, by shock, load flange 3 and in incident bar 7, produce a tensile strain ripple, this ripple is delivered to tensile sample 8 by incident bar 7 and tensile sample 8 is loaded, by 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 normal temperature (room temperature), but can not carry out the dynamic performance testing of material under high temperature.Reason is: (1) is if directly increased temperature sample, due to tensile sample 8 by screw thread directly and incident bar 7 and transmission bar 9 be connected, can make the local temperature of the incident bar 7 that is connected with sample and transmission bar 9 raise, cause the hydraulic performance declines such as the elastic modulus of incident bar 7 and transmission bar 9 and intensity, and velocity of wave changes in bar, cannot accurately calculate tensile sample 8 dynamic stress strain curves by 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 is directly connected with incident bar 7 and transmission bar 9 by screw thread, specimen temperature is very soon along pole transmission, also very difficult sample increased temperature; (3) no matter select incident bar 7 and the transmission bar 9 of which kind of metal, its elastic modulus can decline 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 invention provides a kind of stretching synchronous experimental facility.This device is designed to convex edge platform form by the termination of tensile sample, the termination of the pull bar being connected with tensile sample is designed to wedge-shaped slot form, under the control that is engaged in interlock transmitting valve group by both, realize high temperature synchronous, 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: a kind of stretching synchronous experimental facility, comprise energy absorber 1, energy transmission lever 2, loading flange 3, impact tube 4, transmitting valve 5, impact air chamber 6, incident bar 7, tensile sample 8 and transmission bar 9, energy absorber 1, energy transmission lever 2, impact air chamber 6, incident bar 7 and transmission bar 9 are all placed on platform.Transmitting valve 5 is connected by tracheae with impact air chamber 6; Energy transmission lever 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is tubulose quarter butt, is enclosed within on 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 transmission lever 2 all designs an aperture at axis part with transmitting flange 3, places straight thin iron staff in aperture, 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.Transmitting valve 5 is comprised of transmitting valve, impact air chamber valve and draft cylinder valve, and synchronous air chamber 10 is connected by tracheae 12 through transmitting valve 5 with draft cylinder 14, and the piston 11 in draft cylinder 14 is threaded connection transmission bar 9.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, along diametric(al), remove crescent; In the middle of two convex edge you heads, effectively gauge length section is cylindrical.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, and effective bringing-up section of high temperature furnace 13 is fixed on tensile sample 8 gauge length sections around.
The invention has the beneficial effects as follows: by design tensile sample and pull bar termination type of attachment, preset clearance is set, and by thermal insulation material, 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 all the time in normal temperature state, overcome in background technology the problem that at high temperature local temperature of incident bar and transmission bar can raise.
Below in conjunction with embodiment, the present invention is elaborated.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of background technology tensile test device.
Fig. 2 is the partial enlarged drawing of A part in Fig. 1.
Fig. 3 is the stretch schematic diagram of synchronous experimental facility of the present invention.
Fig. 4 is the partial enlarged drawing of A part in Fig. 3.
Fig. 5 is the partial enlarged drawing of B part in Fig. 3.
Fig. 6 is the schematic diagram of tensile sample in Fig. 4.
In figure, 1-energy absorber, 2-energy transmission lever, 3-load flange, 4-impact tube, 5-transmitting 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 facility comprises energy absorber 1, energy transmission lever 2, loading flange 3, impact tube 4, transmitting 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 transmission lever 2, impact air chamber 6, incident bar 7 and transmission bar 9 are all placed on platform.Energy transmission lever 2, incident bar 7, transmission bar 9, be cylindrical bar; Impact tube 4 is tubulose quarter butt, is enclosed within on 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 at axis part with transmitting flange 3 in energy transmission lever 2, places one and be about the straight thin iron staff of 3cm in aperture, makes the two coaxial; Energy transmission lever 2, to load flange 3, impact tube 4, incident bar 7 and transmission bar 9 be to process (as being all 18Ni or being all Ti) by same material.Launch valve 5 by transmitting valve, impact air chamber valve, three valves of draft cylinder valve form, and transmitting valve is connected by tracheae with impact air chamber 6; Can realize impact air chamber 6 and the synchronous independent pressurising of air chamber 10 and synchronized transmissions; Synchronous air chamber 10 is launched valve group 5 with draft cylinder 14 by interlock and is connected ventilation through tracheae 12, pulls the piston rod in draft cylinder 14, and then pulls the transmission bar 9 being connected with piston rod thread.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, along diametric(al), remove crescent; In the middle of two convex edge you heads, effectively gauge length section 17 is cylindrical.The physical dimension of convex edge platform is less than the physical dimension of wedge-shaped slot, thereby 2mm easily be put into and be left in sample termination can to the gap of 3mm along wedge-shaped slot, makes its integral body just remain cylindrical; In both sides, sample termination and wedge-shaped slot inwall, add 2mm to the thermal insulation material 16 of 3mm, completely cut off on the one hand the transmission of heat by contact of the two, make on the other hand sample termination be fixed in wedge-shaped slot.
During work: first impact tube 4 is pushed and impact air chamber 6, by tensile sample 8 convex edge, two ends platforms and incident bar 7 and transmission bar 9 wedge-shaped slot rod end assemblings.During assembling, with thermal insulation material 16, the inwall of tensile sample 8 two ends sidewalls and wedge-shaped slot rod end is separated in diametric(al), make it can not transmission of heat by contact, tensile sample 8 convex edge, two ends platforms 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, mobile high temperature furnace 13 makes the effective bringing-up section of stove at gauge length section 17 positions of tensile sample 8.At this moment, impact air chamber 6 is stamped into the pressure 0.2Mpa that experiment needs, synchronous air chamber 10 is pressurized to lucky gap-closing under predefined pressure 0.06Mpa, when the given temperature of thermocouple wire 15 reaches the temperature 1000K of experiment needs, opening the high pressure gas that interlock transmitting valve group 5 makes to impact in air chamber 6 and promoting impact tube 4 to loading flange 3 motions, the air pressure of simultaneously synchronous air chamber 10 enters into draft cylinder 14 along tracheae 12, make piston 11 pull fast transmission bar 9, and then make tensile sample 8 convex edge, two ends platforms and incident bar 7 and transmission bar 9 rod end wedge-shaped slot close contacts, at this moment, load stretching ripple and just in time arrive tensile sample 8, tensile sample 8 is loaded, by 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 to high temperature, accurately and reliably material is carried out to the high rate of strain coupling performance test of high temperature.
Claims (1)
1. a stretching synchronous experimental facility, comprise energy absorber (1), energy transmission lever (2), loading flange (3), impact tube (4), transmitting valve (5), impact air chamber (6), incident bar (7), tensile sample (8) and transmission bar (9), energy absorber (1), energy transmission lever (2), impact air chamber (6), incident bar (7) and transmission bar (9) are all placed on platform; Transmitting valve (5) is connected by tracheae with impact air chamber (6); Energy transmission lever (2), incident bar (7), transmission bar (9), be cylindrical bar; Impact tube (4) is tubulose quarter butt, is enclosed within incident bar (7) upper, 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 one end of impact tube (4) collision; Energy transmission lever (2) all designs an aperture at axis part with loading flange (3), places straight thin iron staff in aperture, 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); Transmitting valve (5) is comprised of transmitting valve, impact air chamber valve and draft cylinder valve, synchronous air chamber (10) is connected by tracheae (12) through transmitting valve (5) with draft cylinder (14), and the piston (11) in draft cylinder (14) is threaded connection transmission bar (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, along diametric(al), removes crescent; In the middle of two convex edge you heads, effectively gauge length section (17) is cylindrical; Both sides, tensile sample termination and wedge-shaped slot inwall are thermal insulation material (16), thermocouple wire (15) is strapped in the gauge length section (17) of tensile sample (8), and effective bringing-up section of high temperature furnace (13) is 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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| CN104155166B (en) * | 2014-08-29 | 2016-08-24 | 山西太钢不锈钢股份有限公司 | The sample preparation of a kind of high thermal conductivity metal material compression and assay method thereof |
| CN104280294B (en) * | 2014-10-15 | 2016-06-29 | 北京航空航天大学 | A kind of dynamic thermometer in high temperature fracture strength tension test |
| 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 |
| 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 |
| CN106248496B (en) * | 2016-07-20 | 2019-02-26 | 西北工业大学 | Reciprocating double synchronous package systems based on Hopkinson compression bar |
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| 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 |
| 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 |
| 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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