CN109883858A - A kind of Hopkinson pressure bar test device of magnetic drive - Google Patents
A kind of Hopkinson pressure bar test device of magnetic drive Download PDFInfo
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- CN109883858A CN109883858A CN201910176023.0A CN201910176023A CN109883858A CN 109883858 A CN109883858 A CN 109883858A CN 201910176023 A CN201910176023 A CN 201910176023A CN 109883858 A CN109883858 A CN 109883858A
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- mover
- magnetic drive
- stator
- pressure bar
- hopkinson pressure
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Abstract
The invention discloses a kind of Hopkinson pressure bar test devices of magnetic drive, including the acquisition of rack, magnetic drive module, shock measurement component and data and processing module, the rack includes firm banking and support base, and the support base is arranged and installed on the fixed base in "-" type；The magnetic drive module includes stator, mover and control system, and the stator is fixedly connected on rack, and the mover is assemblied on the sliding rail of stator inner hole；The shock measurement component is made of trip rod, incident bar, transmission bar and buffer block, and is assemblied on support base.The present invention can be realized the material dynamic mechanical performance test of high-precision, high strain rate, solves compressed air in conventional air big gun formula Hopkinson pressure bar test process time-consuming that noise is big, Impact energy is not easy trip rod after the completion of accurately controlling and testing and retracts inconvenient problem, Hopkinson pressure bar measuring accuracy can be greatly improved, shorten the testing time, improves testing efficiency.
Description
Technical field
The invention belongs to material dynamic mechanical technical field of performance test, and in particular to a kind of Hopkinson of magnetic drive
Compression bar test device.
Background technique
Hopkinson (Hopkinson) compression bar measuring technology is to be put forward in 1914 by Hopkinson, originally can only
It is enough to measure the impulse waveform under shock loading.Kolsky improves the device within 1949, and compression bar is divided into two-section,
Sample is placed in one, so as to measure strain-stress relation of the material under impact load.Divide since this device uses
From formula structure, thus referred to as Split Hopkinson Bar.The theory of Hopkinson (Hopkinson) compression bar measuring technology
Basis is one-dismensional stress wave theory, and the strain-stress relation of sample material is derived by the strain on measurement compression bar.At present
It has developed into and obtains material in the main research technique of high-speed dynamic strain rate range internal stress-strain stress relation.The technology
Technical advantage be mainly manifested in: first, successfully avoiding will be on the sample same position while measurement changes over time
The problem of stress and strain；It includes that flow stress becomes with strain rate that second, SHPB test related strain rate range just
Change the strain rate transferred；Third, incident waveform is easily controllable, changes the stroke speed and shape of bullet, that is, be adjusted into
Penetrate shock wave waveform.Material deformational behavior research in this dynamic tensile, Dynamic Fracture provides great convenience.Current
Hopkinson compression bar mostly uses greatly compressed air big gun to project cylindrical type bullet with certain speed as motive drive source, hits
Incident bar.Need to assemble gas chamber using compressed air as driving source, gas chamber compressed air need the regular hour and noise compared with
Greatly；And the impact energy of bullet and being not easy accurately control and can not real-time display, measurement data consistency is poor, needs repeatedly to survey
Amount.After the completion of test, the gas chamber as driving source bullet can not be sucked back it is primary penetrate position, manually incident bullet need to be moved back
It returns.
Magnetic driving equipment, which is equivalent to, radially splits a rotating electric machine, and by the circumference of motor expansion be in line and
It is formed, after stator coil is passed through converting commutating current, generates travelling-magnetic-field in the air gap between stator, mover, in mover
For permanent magnet under the driving force effect that travelling-magnetic-field generates, mover, which obtains, accelerates kinetic energy.Magnetic driving equipment structure is simple, passes through
The current value and commutation sequence of stator coil are adjusted, mover can realize that the high-speed straight-line that different motion speed requires moves back and forth,
Mover can obtain high motion energy in a very short period of time, and stator, Structure of mover can be packaged into epoxy resin
It is whole, there is preferable anti-corrosion, humidity resistance.Magnetic driving equipment can provide huge straight line in short time, short distance
Motion energy can use the linear motion kinetic energy and accelerate to the trip rod in the test of Hopkinson compression bar.Carry magnetic force
The Hopkinson compression bar of driving device can be realized the material dynamic mechanical performance test of high-precision, high strain rate range, solution
It has determined in current conventional air big gun formula Hopkinson pressure bar test process, time-consuming for compressed air, and noise is big, and Impact energy is not easy
Trip rod retracts inconvenient problem after the completion of control and test, can greatly improve Hopkinson pressure bar measuring accuracy, hence it is evident that contracting
The short testing time improves testing efficiency.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of magnetic force drive for segmental defect of the existing technology
Dynamic Hopkinson pressure bar test device is not necessarily to air compressor, is quickly accelerated using magnetic driving equipment to trip rod,
The material dynamic mechanical performance test conditions of high strain rate range are provided, solving compressed air, time-consuming, and noise is big, hits
Trip rod retracts inconvenient problem after the completion of energy velocity is difficult to control and tests, and can improve Hopkinson pressure bar test essence
Degree shortens the testing time, improves testing efficiency.
To achieve the above object, the invention provides the following technical scheme: a kind of Hopkinson pressure bar of magnetic drive is tested
Device, including rack, magnetic drive module, shock measurement component and data acquisition and processing module, magnetic drive module and punching
It hits measurement component to be assemblied in rack, the rack includes firm banking and support base, and the support base is arranged in "-" type
And it installs on the fixed base；
The magnetic drive module includes stator, mover and control system, and the stator is by encapsulating multiphase inside it
Coil composition, the enclosed inside of the mover have the permanent magnet with certain intervals distance arrangement, and the stator and mover are adopted
Integral with epoxy resin encapsulation, the stator is fixedly connected on rack, and the mover is assemblied in the sliding rail of stator inner hole
On, the mover reciprocatingly slides along sliding rail, and the control system is by control circuit board, position sensor and interactive display
Screen composition, control circuit board are mainly used for the coil current commutation control of stator, the interactive display screen person of being convenient to operation input
Related test parameters and real-time display equipment operating parameter；
The shock measurement component is made of trip rod, incident bar, transmission bar and buffer block, and is assemblied in support base
On, and axially align, high speed strain piece is mounted on the incident bar and transmission bar, the high speed strain piece is connected to dynamic
Strain testing instrument.
Preferably, the coil on the stator is three-phase electricity coil, and coil inside is equipped with iron core, when three-phase current is by changing
When phase sequence is powered to the coil on stator, travelling-magnetic-field is formed between air gap, which will carry out straight line by current commutation sequence
It is mobile.
Preferably, the position sensor is hall sensor, real for detecting the movement position and movement velocity of mover
Existing brushless commutation.
Preferably, the rack is splicing structure, can freely adjust length, assembly is reserved on the firm banking
Hole is adopted with support base and is screwed.
Preferably, the control circuit board is using external programming control access, for accessing External memory equipment read-write control
System order, and record the kinergety of mover.
Preferably, it is reserved with pilot hole on the mover, with shock boom end assembly connection.
Preferably, the permanent magnet on the mover is made of rare earth permanent-magnetic material, such as neodymium iron boron, SmCo or alnico,
It can also be made of ferrite permanent-magnet materials, the coil of the stator is made of red copper material or brass material.
Preferably, the buffer block is that soft rubber damps material, for playing buffer stop to transmission bar.
Loop A X, BY, CZ are stator A, B, C three-phase windings, after being passed through three phase sine electric current in stator coil winding, gas
Travelling-magnetic-field is generated in gap, mover obtains electromagnetic push under traveling wave magnetic fields, into stage of accelerated motion, mover movement speed
Degree always slightly lags behind the movement speed of stator travelling-magnetic-field, and the translational speed difference of the two may be expressed as:
S=(Vs-V)/Vs
Wherein, Vs is stator travelling-magnetic-field movement speed；V is mover movement speed.
The acceleration of motion of mover determined by the weight of travelling-magnetic-field thrust, mover rail friction resistance, mover, traveling wave
Magnetic field thrust is by the size of gaps and mover between stator coil the number of turns, power-on voltage, electrical current and commutation frequency, stator mover
Interior permanent magnet performance is determined.Mover is accelerated along guide rail to certain distance, obtains material dynamic mechanical performance test institute
The impact kinetic energy needed.Stator coil is stopped powering, travelling-magnetic-field disappears, and mover impacts incident together with trip rod high-speed motion
Bar, the stress wave of generation pass sequentially through incident bar, tested material and transmission bar, superelevation dynamic strain indicator acquire incident bar and
The compression verification data under high-speed can be obtained in stress wave data on transmission bar after data processing.It is fixed by adjusting
The size of current of subcoil can control the impact energy of mover, and adjusting to the commutation of stator coil electric current can be achieved the quick of mover
Accurate back resetting improves the operational efficiency of test macro.
Technical effect and advantage of the invention:
Magnetic drive Hopkinson pressure bar test device solves in current conventional air big gun formula high speed compression bar test process,
Time-consuming for compressed air, and noise is big, and trip rod retracts inconvenient problem after the completion of Impact energy is difficult to control and tests, and can mention
High Hopkinson pressure bar measuring accuracy shortens the testing time, improves testing efficiency.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is magnetic drive module assembling structure schematic diagram of the invention；
Fig. 3 is stator structure schematic diagram of the invention；
Fig. 4 is Structure of mover schematic diagram of the invention；
Fig. 5 is dynamic strain measuring instrument of the invention, high speed strain slice mounting structure schematic diagram；
Fig. 6 is magnetic drive schematic diagram of the invention.
In figure: 1 buffer block, 2 transmission bars, 3 support bases, 4 samples, 5 incident bars, 6 trip rods, 7 stators, 701 coils,
702 sliding rails, 8 firm bankings, 9 movers, 901 permanent magnets, 10 high speed strain pieces.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
As shown in figures 1 to 6, the Hopkinson pressure bar test device of a kind of magnetic drive, including rack, magnetic drive module,
Shock measurement component and data acquisition and processing module, magnetic drive module and shock measurement component are assemblied in rack, institute
Stating rack includes firm banking 8 and support base 3, and the support base 3 is arranged and is mounted on firm banking 8 in "-" type；
The magnetic drive module includes stator 7, mover 9 and control system, and the stator 7 is by encapsulating inside it more
Phase coil 701 forms, and the enclosed inside of the mover 9 has the permanent magnet 901 with certain intervals distance arrangement, the stator 7
With mover 9 be all made of epoxy resin encapsulation it is integral, the stator 7 is fixedly connected on rack, and the mover 9 is assemblied in stator 7
On the sliding rail 702 of inner hole, the mover 9 reciprocatingly slides along sliding rail 702, the control system by control circuit board,
Position sensor and interactive display screen composition, control circuit board are mainly used for 701 current commutation of the coil control of stator 7, hand over
The mutual formula display screen person of being convenient to operation inputs related test parameters and real-time display equipment operating parameter；
The shock measurement component is made of trip rod 6, incident bar 5, transmission bar 2 and buffer block 1, and is assemblied in branch
It supports on seat 3, and axially aligns, high speed strain piece 10, the high speed strain piece are mounted on the incident bar 5 and transmission bar 2
10 are connected to dynamic strain measuring instrument.
Coil 701 on the stator 7 is three-phase electricity coil, and iron core is equipped with inside coil 701, when three-phase current is by changing
When phase sequence is powered to the coil 701 on stator 7, travelling-magnetic-field is formed between air gap, which will be carried out by current commutation sequence
Linear movement.
The position sensor is hall sensor, for detecting the movement position and movement velocity of mover 9, is realized brushless
Commutation.
The rack is splicing structure, can freely adjust length, pilot hole is reserved on the firm banking 8, with branch
Support seat 3, which is adopted, to be screwed.
The control circuit board is using external programming control access, for accessing External memory equipment Read-write Catrol order,
And record the kinergety of mover 9.
It is reserved with pilot hole on the mover 9, with 6 end assembly connection of trip rod.
Permanent magnet 901 on the mover 9 is made of rare earth permanent-magnetic material, can also such as neodymium iron boron, SmCo or alnico
To be made of ferrite permanent-magnet materials, the coil 701 of the stator 7 is made of red copper material or brass material.
The buffer block 1 is that soft rubber damps material, for playing buffer stop to transmission bar 2.
Start-up circuit after 7 polyphase winding 701 of stator is powered, generates travelling-magnetic-field, in the driving effect of magnetic field coupling power
Under, mover 9 obtains high impact velocity in moment, and drives trip rod 6, and high-speed impact incident bar 5, stress wave passes through incidence
Bar 5 is transferred to transmission bar 2 through tested material, and transmission bar 2, which flies out, to be encountered buffer block 1 and stop and stop motion, dynamic strain
Tester acquires the stress wave data on incident bar 5 and transmission bar 2, and completing Correlation method for data processing can be obtained under high-speed
4 compression verification data of material sample.
Specifically includes the following steps:
1) test material sample 4 is bonded and fixed between incident bar 5 and transmission bar 2；
2) the initial relative position of incident bar 5, transmission bar 2, trip rod 6 and mover 9 is adjusted；
3) high speed strain piece 10 is pasted on incident bar 5 and transmission bar 2, connecting wire to dynamic strain measuring instrument；
4) equipment inspection powers on；
5) according to material high-speed test request, required impact energy is calculated, in the interaction display of system control module
Parameter input is completed in screen；
6) control system issues equipment enabled instruction, and the coil 701 of stator 7 flows through electric current, under the thrust of magnetic field, moves
Son 9 drives trip rod 6 to obtain very big speed kinetic energy in a very short period of time, hits incident bar 5, forms incidence wave；
7) dynamic strain measuring instrument acquires data and is stored in data storage, and carries out calculating analysis to acquisition data,
Calculated result is shown on interactive display；
8) 701 electric current of the coil commutation of stator 7, magnetic field apply backhaul pulling force to mover 9, and 9 drawback movement of mover is to initial
Position；
9) pass hull closure, power-off；
10) discharged material sample 4, test are completed.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of Hopkinson pressure bar test device of magnetic drive, including rack, magnetic drive module, shock measurement component and
Data acquisition and processing module, magnetic drive module and shock measurement component are assemblied in rack, it is characterised in that:
The rack includes firm banking (8) and support base (3), and the support base (3) arranges in "-" type and is mounted on fixation
On pedestal (8)；
The magnetic drive module includes stator (7), mover (9) and control system, and the stator (7) is by encapsulating inside it
Polyphase winding (701) composition, the enclosed inside of the mover (9) have the permanent magnet (901) with certain intervals distance arrangement, institute
It states stator (7) and mover (9) is all made of that epoxy resin encapsulation is integral, and the stator (7) is fixedly connected on rack, the mover
(9) it is assemblied on the sliding rail (702) of stator (7) inner hole, the mover (9) reciprocatingly slides along sliding rail (702), described
Control system is made of control circuit board, position sensor and interactive display screen, and control circuit board is mainly used for stator (7)
The control of coil (701) current commutation, the interactive display screen person of being convenient to operation input related test parameters and real-time display equipment
Operating parameter；
The shock measurement component is made of trip rod (6), incident bar (5), transmission bar (2) and buffer block (1), and is assembled
It on support base (3), and axially aligns, is mounted on high speed strain piece (10), institute on the incident bar (5) and transmission bar (2)
It states high speed strain piece (10) and is connected to dynamic strain measuring instrument.
2. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: described fixed
Coil (701) on sub (7) is three-phase electricity coil, and iron core is equipped with inside coil (701), when three-phase current presses commutation sequence pair
When coil (701) on stator (7) is powered, travelling-magnetic-field is formed between air gap, which will carry out straight line by current commutation sequence
It is mobile.
3. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: institute's rheme
It sets sensor and realizes brushless commutation for detecting the movement position and movement velocity of mover (9) for hall sensor.
4. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: the machine
Frame is splicing structure, can freely adjust length, be reserved with pilot hole on the firm banking (8), uses spiral shell with support base (3)
Nail is fixed.
5. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: the control
Circuit board processed for accessing External memory equipment Read-write Catrol order, and records mover (9) using external programming control access
Kinergety.
6. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: described dynamic
It is reserved with pilot hole on sub (9), with trip rod (6) end assembly connection.
7. the Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: the mover
(9) permanent magnet (901) on is made of rare earth permanent-magnetic material, such as neodymium iron boron, SmCo or alnico, can also use ferrite
Permanent-magnet material is made, and the coil (701) of the stator (7) is made of red copper material or brass material.
8. a kind of Hopkinson pressure bar test device of magnetic drive according to claim 1, it is characterised in that: described slow
Rushing block (1) is that soft rubber damps material, for playing buffer stop to transmission bar (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910176023.0A CN109883858A (en) | 2019-03-08 | 2019-03-08 | A kind of Hopkinson pressure bar test device of magnetic drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910176023.0A CN109883858A (en) | 2019-03-08 | 2019-03-08 | A kind of Hopkinson pressure bar test device of magnetic drive |
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| CN201910176023.0A Pending CN109883858A (en) | 2019-03-08 | 2019-03-08 | A kind of Hopkinson pressure bar test device of magnetic drive |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243704A (en) * | 2019-06-21 | 2019-09-17 | 武汉理工大学 | The Hopkinson high-speed hydraulic bulging test device and method of electromagnetism power drive |
| CN111579401A (en) * | 2020-05-21 | 2020-08-25 | 西北工业大学 | Brittle material dynamic compression experimental method based on electromagnetic Hopkinson bar |
| CN112113828A (en) * | 2020-09-28 | 2020-12-22 | 中煤科工开采研究院有限公司 | Push rod assembly of Hopkinson pressure bar system and method for performing material impact test |
| CN112665994A (en) * | 2020-12-17 | 2021-04-16 | 武汉理工大学 | Gravity unloading rock mass dynamic unloading test system and method |
| CN114112743A (en) * | 2020-09-01 | 2022-03-01 | 西安石油大学 | Electromagnetic Hopkinson bar and stress wave generator thereof |
| CN114166617A (en) * | 2021-11-09 | 2022-03-11 | 武汉理工大学 | Hopkinson pressure bar transmitting device based on electromagnetic coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243704A (en) * | 2019-06-21 | 2019-09-17 | 武汉理工大学 | The Hopkinson high-speed hydraulic bulging test device and method of electromagnetism power drive |
| CN111579401A (en) * | 2020-05-21 | 2020-08-25 | 西北工业大学 | Brittle material dynamic compression experimental method based on electromagnetic Hopkinson bar |
| CN114112743A (en) * | 2020-09-01 | 2022-03-01 | 西安石油大学 | Electromagnetic Hopkinson bar and stress wave generator thereof |
| CN114112743B (en) * | 2020-09-01 | 2024-04-05 | 西安石油大学 | Electromagnetic hopkinson rod and stress wave generator thereof |
| CN112113828A (en) * | 2020-09-28 | 2020-12-22 | 中煤科工开采研究院有限公司 | Push rod assembly of Hopkinson pressure bar system and method for performing material impact test |
| CN112665994A (en) * | 2020-12-17 | 2021-04-16 | 武汉理工大学 | Gravity unloading rock mass dynamic unloading test system and method |
| CN112665994B (en) * | 2020-12-17 | 2024-03-22 | 武汉理工大学 | Gravity unloading rock mass dynamic unloading test system and method |
| CN114166617A (en) * | 2021-11-09 | 2022-03-11 | 武汉理工大学 | Hopkinson pressure bar transmitting device based on electromagnetic coil |
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