CN105300792A - Clamping device of Hopkinson pull bar test-piece and experimental method - Google Patents
Clamping device of Hopkinson pull bar test-piece and experimental method Download PDFInfo
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- CN105300792A CN105300792A CN201510793008.2A CN201510793008A CN105300792A CN 105300792 A CN105300792 A CN 105300792A CN 201510793008 A CN201510793008 A CN 201510793008A CN 105300792 A CN105300792 A CN 105300792A
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Abstract
The invention discloses a clamping device of a Hopkinson pull bar test-piece and an experimental method and belongs to the field of shock dynamics experiment. The experimental device is used in pairs. One end of an adapter is in threaded connection with an incident bar or transmission bar, and the threaded clearance is filled with thread seal tape so as to avoid the damage of shock wave to connecting thread; and the other end of the adapter is provided with a square groove to be connected to a flat test-piece. The square groove which matches the test-piece undergoes plane machining into tiny serrated teeth so as to increase frictional force during clamping. The outer rim of the adapter is processed into taper thread which matches a nut. When the clamping device is in use, clamping force perpendicular to the groove surface is provided by screwing-in the nut. According to the invention, the problem that screw thread is not easy to process in a composite material and high-strength glue is nonuniform during gluing process can be greatly avoided, connection type of a fibrous composite material under dynamic tension is studied, and a forceful foundation is laid for the constitutive relation of the fibrous composite material under dynamic tension.
Description
Technical field
The invention discloses a kind of clamping device and experimental technique of Hopkinson pull rod test specimen, be specifically related to the method for clamping of Hopkinson pull rod and test specimen under pull bar shock load, belong to shock dynamics experiment field.
Background technology
In the dynamic tensile experiment of metal material, the connection of tensile sample and load bar substantially adopts and is threaded.Compound substance, as the very high anisotropy heterogeneous material of a kind of stretching/shear resistance ratio, can not be realized by the mode be directly threaded, and must consider the problem of stress concentration that effect of end surface produces, i.e. the impact of test club and test specimen surface of contact.So in dynamic tensile experiment, the connection of test club and test specimen must consider following problem.1. the stress between load bar and sample is concentrated must reduce to minimum; 2. between load bar and sample, avoid the mismatch of wave impedance as far as possible, to reduce the weakening of the effective impulse load that stress wave reflection causes, thus be conducive to wave form analysis; 3. tensile load is preferably only sheared loading zone by one by load bar and is just passed on sample, avoids multiple pathways transmitted load as far as possible, causes stretching unsuccessfully, or produces too many interference noise and affect waveform acquisition and analysis; 4. the area transmitting shear-type load should be enough large, otherwise probably shear failure occurs.
The connection of earlier experiments bar and test specimen connects to strengthen bond area mainly through high shear strength special adhesive, but pre-service need be carried out to bonding plane, ensure tack coat uniform bubble-free, and take measures to prevent notch from compressing the first transaction of a day's business, increase glue line solidification precompression.In addition because bearing mode is the bonding shearing resistance of glue-line, so dynamic changes process affects larger by the interfacial adhesion strength of experiment glue intensity, bonding groove face and compound substance.Therefore, the selection of adhesive glue, the process in early stage of bonding plane just seems important.The mode of this kind of transmitted load, requires stretching impulse load to pass to test load bar by the bonding plane uniform force at sample two ends, if the uneven sample entirety that just very easily occurs of distribution of force is extracted out or local is extracted.For unidirectional fortifying fibre compound substance, particularly high-strength Unidirectional Fiber-reinforced Composite, more difficult accomplishing the whole bonding plane in sample two ends transmits load diatibution evenly, so such MATERIALS ' DYNAMIC stretching experiment relative difficulty.And for the immersion poor compound substance in the interface that high-strength polyethylene is such, by means of only this adhesive test technology, not by other high pressure method of clamping, dynamic tensile experiment is also difficult to successfully.
And tradition is gluing also exists limitation: 1) connector versatility is not strong, the different material of material mechanical performance need consider redesign connector, 2) repeat comparatively to bother, the glue on connector and test specimen relic need be removed, 3) install, dismantle inconvenience, special gelatin solidification needs the time.
Summary of the invention
In order to the deficiency of the complicacy and traditional experiment equipment that overcome the connection procedure of test club and test specimen in dynamic tensile experiment process, the present invention aims to provide the clamping device of test club and test specimen in a kind of dynamic tensile experiment process, tensile load on load bar just can be passed on test specimen by a large shearing loading zone, and well prevent the shear failure of test specimen loaded segment.
The present invention is achieved by the following technical solutions:
A clamping device for Hopkinson pull rod test specimen, comprises adapter, and adapter left end is provided with circular hole, and circular-hole internal-wall is provided with screw thread, and adapter left end is connected with incident bar or transmission bar by screw thread; Be provided with taper thread outside adapter right-hand member, adapter right-hand member is connected with corresponding conical nut; Adapter right-hand member is provided with square groove, the center line of square groove overlaps with the center line of adapter, Hopkinson pull rod test specimen inserts in this square groove, upper and lower two surfaces of groove are provided with sawtooth, the left end of described square groove vertically connects second segment groove, vertically connects the 3rd section of groove left in the upper end of second segment groove.
In said apparatus, the specification of described taper thread is 3/4'', and tapering is 1: 16, and the effective length of screw thread is 17mm.
In said apparatus, the profile angle of described sawtooth is 60 degree, and chi height is 0.5mm.
In said apparatus, described square groove is the groove of clamping test pieces, and the width of square groove is set as 2mm according to specimen thickness, and groove runs through accurate joint completely in diametric(al), and flute length is set as 35mm according to piece lengths; The width of second segment groove and the 3rd section of groove is 1mm, and the length of second segment groove and the 3rd section of groove is respectively 11mm, 29mm.The object arranging second segment groove and the 3rd section of groove is: be used for reducing integral rigidity and produce effective distortion and reach enough blessing power.
In said apparatus, the thread pitch raw material band of described adapter is filled.
The clamping device of Hopkinson pull rod test specimen provided by the invention, in use: two identical supporting paired uses of adapter, adapter left end (A end) is threaded connection with incident bar or transmission bar, and thread pitch raw material band is filled, thus weakens the destruction to test club screw thread.Adapter right-hand member (B end) is opened square groove and is connected with test specimen.The groove plane machining coordinated with test specimen becomes small zigzag to increase friction force when clamping, connector left end outer rim is processed with taper thread and coordinates with corresponding conical nut, left end Light deformation when second segment groove and the 3rd section of groove allow nut to screw in, thus required holding force is provided.
Experimental technique is:
(1) the respectively incident bar of regulating rotary joint left end or the levelness of transmission bar and right alignment, Hopkinson pull rod test specimen inserts in the square groove of adapter right-hand member, and in the middle of checking experiment bar, whether foil gauge (in the middle of test club) glues, and whether ground wire connects tightly;
(2) adapter is closely tightened by raw material band and test club;
(3) again check levelness and the right alignment of incident bar and transmission bar, avoid the error because raw material band causes;
(4) test specimen is inserted in the square groove of adapter;
(5) flare nut is added raw material band and adapter right-hand member is tightened;
(6) bullet is disclosed in gun tube, open high dynamic strain indicator, high speed data acquisition system and computing machine Datalab data acquisition software, click software Datalab software word sampling instrument button;
(7) open valve to test, and raw data is deposited;
(8) turn on flare nut, take out test specimen;
(9) repeat above-mentioned steps, LOADING RATES can be studied on the impact under compound substance different stretch speed.
The invention has the beneficial effects as follows, while guarantee experimentation accuracy, the experimental period of traditional cementi test specimen can be reduced; Connector is without the need to dismounting, reusable, and connector highly versatile can standardized designs connector; And test specimen is easy for installation, save the test operation time, ensure experimentation accuracy simultaneously.Thus achieve the ease of Use of the stretching experiment of composition fiber.
Accompanying drawing explanation
Fig. 1 is the structural representation of Hopkinson pull rod.
Fig. 2 is the structural representation of adapter.
In figure, 1 is snubber device, and 2 is single wave loops bar, and 3 is load bar head, and 4 is drop bar, and 5 is foil gauge, 6 is incident bar, and 7 is clamping device, and 8 is test specimen, and 9 is transmission bar, and 10 is adapter, 11 is circular hole, and 12 is taper thread, and 13 is square groove, and 14 is second segment groove, and 15 is the 3rd section of groove.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment:
Separate type Hopkinson tie system mainly comprises three parts: holder part, pull bar main part and and part of data acquisition.Wherein holder part be mainly used for support steady brace part and ensure the level of pull bar.
Fig. 1 is the using state schematic diagram of Hopkinson pull rod.Hopkinson pull rod main part comprises snubber device 1, single wave loops bar 2, load bar head 3, impact tube (being commonly called as bullet) 4, incident bar 6, transmission bar 9 and corresponding pneumatic shuttle composition.Data acquisition system (DAS) is then by foil gauge 5, the Hui Sitong bridge road be pasted onto on pole (foil gauge connecting bridge box), high dynamic strain indicator and high speed acquisition system composition.
In separate type Hopkinson pull bar, drop bar, incident bar, transmission bar are all made up of the straight-bar identical with external diameter by material property.When drop bar Impinging coaxial incident bar, produce an approximate compression square wave at incident bar, this elastic compression ripple passes to incident bar and sample interface, and a part passes into sample, and namely a part is reflected back incident bar with the form of stretching ripple becomes reflection strain wave.When the wave of compression entering sample arrives sample and transmission bar interface, have sub-fraction to return sample and roundtrip reaches stress equilibrium in the sample, another part passes to transmission bar formation transmission strain wave.Change mechanical signal into electrical signal by Hui Sitong bridge road and strainmeter, the mechanical property of test specimen can be drawn by process computational analysis electrical signal.
As shown in Figure 2, a kind of clamping device of Hopkinson pull rod test specimen, comprises adapter 10, and adapter 10 left end is provided with circular hole 11, and circular hole 11 inwall is provided with screw thread, and adapter 10 left end is connected with incident bar or transmission bar by screw thread; Be provided with taper thread 12 outside adapter 10 right-hand member, adapter 10 right-hand member is connected with corresponding conical nut; Adapter 10 right-hand member center is provided with square groove 13, the center line of square groove 13 overlaps with the center line of adapter 10, Hopkinson pull rod test specimen inserts in this square groove 13, upper and lower two surfaces of groove are provided with sawtooth, the left end of described square groove 13 vertically connects second segment groove 14, vertically connects the 3rd section of groove 15 left in the upper end of second segment groove 14.
In said apparatus, the specification of described taper thread is 3/4'', and tapering is 1: 16, and the effective length of screw thread is 17mm.
In said apparatus, the profile angle of described sawtooth is 60 degree, and chi height is 0.5mm.
The clamping device that the present embodiment provides, its adapter overall length is 80mm, and left end diameter is 27mm; The left end circular hole degree of depth is 27mm, and aperture is 19mm, and relief groove diameter is 20mm; The vertical length that right-hand member taper thread is corresponding is 32mm; The width of the square groove of clamping test pieces is set as 2mm according to specimen thickness, and groove runs through accurate joint completely in diametric(al), and flute length is set as 35mm according to piece lengths.Second segment groove and the 3rd section of slot thickness are 1mm, and the length of second segment groove and the 3rd section of groove is respectively 11mm, 29mm; The object arranging second segment groove and the 3rd section of groove is: be used for reducing integral rigidity and produce effective distortion and reach enough blessing power.
The experimentation of the clamping device of above-mentioned Hopkinson pull rod test specimen is adopted to be:
(1) preliminary work before experiment, such as: the levelness and the right alignment that regulate incident bar and transmission bar, checks whether foil gauge glues, and whether ground wire connects tightly;
(2) adapter closely being tightened by raw material band and test club, before each test, guarantee that " loading joint " tightens up, in order to eliminate the waveform clutter that " loading joint " and sample connection of thread cause, tightening up in the coupling of screw thread place raw material band;
(3) again check levelness and the right alignment of incident bar and transmission bar, avoid the error because raw material band causes;
(4) test specimen is inserted in square groove;
(5) flare nut is added raw material band and the adapter other end is tightened;
(6) bullet is disclosed in gun tube, open high dynamic strain indicator, high speed data acquisition system and computing machine Datalab data acquisition software, click software Datalab software word sampling instrument button;
(7) again check that whether tie system is ready.By rigidity iron wire, drop bar is pushed in transmitting gun tube.Open charging valve, cylinder is inflated, and see that top tensimeter is to required pressure, removes switch and completes cylinder charge to off-position.
(8) when switch is removed to transmitting site, i.e. emission bullet, equipment is in emission state.Be pasted onto foil gauge on pole by being connected to strain bridge box to ridge method in full-bridge, then output to dynamic strain indicator by bridge box and carry out data amplification, then adopt card through high speed number and carry out data acquiring and recording, on the virtual oscilloscope of computing machine, finally show original waveform can gather, record, store time domain dynamic strain signal.And raw data is deposited;
(9) turn on flare nut, take out test specimen;
(10) repeat above-mentioned steps, LOADING RATES can be studied on the impact under compound substance different stretch speed.
Claims (6)
1. a clamping device for Hopkinson pull rod test specimen, it is characterized in that: comprise adapter, adapter left end is provided with circular hole, and circular-hole internal-wall is provided with screw thread, adapter left end is connected with incident bar or transmission bar by screw thread; Be provided with taper thread outside adapter right-hand member, adapter right-hand member is connected with corresponding conical nut; Adapter right-hand member is provided with square groove, the center line of square groove overlaps with the center line of adapter, Hopkinson pull rod test specimen inserts in this square groove, upper and lower two surfaces of groove are provided with sawtooth, the left end of described square groove vertically connects second segment groove, vertically connects the 3rd section of groove left in the upper end of second segment groove.
2. the clamping device of Hopkinson pull rod test specimen according to claim 1, is characterized in that: the specification of described taper thread is 3/4'', and tapering is 1: 16, and the effective length of screw thread is 17mm.
3. the clamping device of Hopkinson pull rod test specimen according to claim 1, is characterized in that: the profile angle of described sawtooth is 60 degree, and chi height is 0.5mm.
4. the clamping device of Hopkinson pull rod test specimen according to claim 1, is characterized in that: described square groove is the groove of clamping test pieces, and the width of square groove is set as 2mm according to specimen thickness, and flute length is set as 35mm according to piece lengths; The width of second segment groove and the 3rd section of groove is 1mm, and the length of second segment groove and the 3rd section of groove is respectively 11mm, 29mm.
5. the clamping device of Hopkinson pull rod test specimen according to claim 1, is characterized in that: the thread pitch raw material band of described adapter is filled.
6. an experimental technique for Hopkinson pull rod test specimen, adopts the clamping device described in any one of claim 1 ~ 5, it is characterized in that: comprise the following steps:
(1) the respectively incident bar of regulating rotary joint left end or the levelness of transmission bar and right alignment, Hopkinson pull rod test specimen inserts in the square groove of adapter right-hand member, and whether the foil gauge in the middle of checking experiment bar glues, and whether ground wire connects tightly;
(2) adapter is closely tightened by raw material band and test club;
(3) again check levelness and the right alignment of incident bar and transmission bar, avoid the error because raw material band causes;
(4) test specimen is inserted in the square groove of adapter;
(5) flare nut is added raw material band and adapter right-hand member is tightened;
(6) bullet is disclosed in gun tube, open high dynamic strain indicator, high speed data acquisition system and computing machine Datalab data acquisition software, click software Datalab software word sampling instrument button;
(7) open valve to test, and raw data is deposited;
(8) turn on flare nut, take out test specimen;
(9) repeat above-mentioned steps, LOADING RATES can be studied on the impact under compound substance different stretch speed.
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| CN201510793008.2A CN105300792B (en) | 2015-11-18 | 2015-11-18 | Clamping device and experimental method for Hopkinson pull rod test piece |
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| CN106226176A (en) * | 2016-07-07 | 2016-12-14 | 中南大学 | Rock dynamic mechanical test device and method under underwater explosion loading effect |
| CN106442166A (en) * | 2016-09-14 | 2017-02-22 | 太原理工大学 | Device and method for high-temperature impact torsion test of hopkinson bar |
| CN107219139A (en) * | 2017-05-24 | 2017-09-29 | 西北工业大学 | High-speed cutting experimental provision based on split hopkinson press bar system |
| CN108595873A (en) * | 2018-05-07 | 2018-09-28 | 北京理工大学 | A kind of novel twin shear strength criterion and test method for realizing stress state control |
| CN108956333A (en) * | 2018-08-08 | 2018-12-07 | 西南交通大学 | Dynamic draws and cuts load testing machine and dynamic tensile shear testing system |
| CN110308035A (en) * | 2019-06-10 | 2019-10-08 | 南京理工大学 | SHTB for soft material test specimen tests clamping device and test method |
| CN110579413A (en) * | 2019-06-28 | 2019-12-17 | 天津大学 | variable-rod-diameter Hopkinson pressure bar experiment device and method |
| CN111398163A (en) * | 2020-03-23 | 2020-07-10 | 浙江方圆检测集团股份有限公司 | Disc brake pad shear test device |
| CN113945514A (en) * | 2021-10-21 | 2022-01-18 | 中交鹭建有限公司 | SHPB reinforcing bar and concrete dynamic bonding slippage test additional device |
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| CN106226176A (en) * | 2016-07-07 | 2016-12-14 | 中南大学 | Rock dynamic mechanical test device and method under underwater explosion loading effect |
| CN106226176B (en) * | 2016-07-07 | 2018-12-25 | 中南大学 | Underwater explosion loading acts on lower rock dynamic mechanical test method |
| CN106442166A (en) * | 2016-09-14 | 2017-02-22 | 太原理工大学 | Device and method for high-temperature impact torsion test of hopkinson bar |
| CN107219139A (en) * | 2017-05-24 | 2017-09-29 | 西北工业大学 | High-speed cutting experimental provision based on split hopkinson press bar system |
| CN108595873A (en) * | 2018-05-07 | 2018-09-28 | 北京理工大学 | A kind of novel twin shear strength criterion and test method for realizing stress state control |
| CN108956333A (en) * | 2018-08-08 | 2018-12-07 | 西南交通大学 | Dynamic draws and cuts load testing machine and dynamic tensile shear testing system |
| CN110308035A (en) * | 2019-06-10 | 2019-10-08 | 南京理工大学 | SHTB for soft material test specimen tests clamping device and test method |
| CN110579413A (en) * | 2019-06-28 | 2019-12-17 | 天津大学 | variable-rod-diameter Hopkinson pressure bar experiment device and method |
| CN111398163A (en) * | 2020-03-23 | 2020-07-10 | 浙江方圆检测集团股份有限公司 | Disc brake pad shear test device |
| CN111398163B (en) * | 2020-03-23 | 2022-07-22 | 浙江方圆检测集团股份有限公司 | Disc brake pad shear test device |
| CN113945514A (en) * | 2021-10-21 | 2022-01-18 | 中交鹭建有限公司 | SHPB reinforcing bar and concrete dynamic bonding slippage test additional device |
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