CN109187231A - A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar - Google Patents
A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar Download PDFInfo
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- CN109187231A CN109187231A CN201811026294.XA CN201811026294A CN109187231A CN 109187231 A CN109187231 A CN 109187231A CN 201811026294 A CN201811026294 A CN 201811026294A CN 109187231 A CN109187231 A CN 109187231A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/26—Investigating twisting or coiling properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to In Dynamic Testing of Materials equipment technical fields, and in particular to a kind of electromagnetism pressure-rotary split-Hopkinson torsional bar, including incident bar, transmission bar and the test specimen for being placed on incident bar Yu transmission bar adjacent end portion；It further include a cylinder-shaped fixed frame, the fixed frame is disposed coaxially on the cantilevered end of incident bar, several rotating vanes are fixed on the incident bar, the rotating vane is pushed by being arranged in the pulsed electromagnetism loader on the inside of fixed frame, and the pulsed electromagnetism loader is electrically connected with transient state power supply group and control unit；In the present invention, pressure is applied to rotating vane using pulsed electromagnetism loader, the shortcoming for compensating for existing pre- energy-storage type separate type split-Hopkinson torsional bar, the Hopkinson torsion bar device of explosive driving and T shape Hopkinson torsion bar device substantially reduces experiment difficulty, greatly improves conventional efficient.
Description
Technical field
The invention belongs to In Dynamic Testing of Materials equipment technical fields, and in particular to a kind of electromagnetism pressure-rotary Hope
The gloomy torsion bar of gold.
Background technique
Split hopkinson bar is a kind of effective experiment dress for studying material dynamic mechanical performance under one-dimensional stress state
It sets.Compared with Hopkinson pressure bar and pull rod, radial inertial effect is not present in split-Hopkinson torsional bar in bar.Therefore, torsion examination
Furthermore test closest to one-dimension stress wane it is assumed that, disperse will not occur for the propagation of torsional wave in elastic rod.In the seventies
T.Nicholas et al. has invented pre- energy-storage type separate type split-Hopkinson torsional bar.So-called pre- energy-storage type separate type split-Hopkinson torsional bar
That will reverse incident bar to be divided into two, wherein one end have convenient for plus moment of face (load) swivel head, the other end then with test specimen phase
Even (this section is known as pretwist section).In boundary, with a tight-holding type fixture, (wherein main part is the spiral shell that a middle part is provided with annular V-shaped groove
Bolt) bar cramp is lived, prevent its torsion.Swivel head is rotated to reverse to pretwist section with jack or other devices and is loaded,
Torsional energy is store in advance in this section.When pre- energy storage magnitude reaches experimenter expectation value, experimenter discharges rapidly clamping device,
The energy (stress, strain) for preloading section is transmitted to the non-loaded segment formation torsion load wave of incident bar in the form of wave.Using this
The main shortcoming of kind mode has:
1. clamping device is difficult to clamp bar completely without rotating, reinforcement clamp is often constantly removed during loading
Clamp force (further tightens bolt), to prevent rotational slide.Bolt can usually occur in the process to be broken suddenly, cause this time
The failure of an experiment.
2. the bolt release clip that this pre- energy-storing-type torsion bar is provided with annular V-shaped groove by twisting into two parts middle part in experiment, and
The process for twisting into two parts bolt has very big randomness, seriously affects the repeatability of the experiment condition of waveform.
1971, Duffy etc. proposed a kind of novel explosively loading mode.It is symmetrical (same in incident bar loading end two sides
Diametrically) be connected two panels rotating vane, and two groups of blastings charge are symmetrically arranged in the same side of two rotating vanes.When load, two
Packet explosive passes through the in parallel of fuse cord and realizes while lighting, and the impact force for generation of exploding, which is equivalent to, applies a pair of of power to load bar
It is even, torsional wave is formed, the instantaneous herk of dynamic torsion load is completed.Blast impulse loads compared with pretorque loading method,
It can be difficult to control to avoid chucking pressure, test the problem of being easy failure, and explosively loading also has the characteristics that instantaneity, energy
When enough substantially reducing stress wavefront and rising, but there is also obvious short slabs: (1) since Explosive ingredients, quantity are not easy accurately to control and
The influence of the unpredictable factors such as explosive dampness, load torque are unable to accurately control, and experimental repeatability is poor；(2) explosively loading mistake
Cheng Zhong, test specimen are actually by allergic effect variability loading effect, i.e., common explosively loading mode is difficult to ensure that constant strain rate loads.
Therefore, this kind of method is not also used widely.
Ginger tin power in 2013 etc. has invented T shape separate type split-Hopkinson torsional bar, and this invention almost overcomes pre- energy-storing-type
All disadvantages of torsion bar, but because of reasons in structure, complicated bending wave is inevitably generated in conversion equipment, it is this curved
Bent wave is difficult to eliminate again, can be passed in torsion incident bar.In addition, for the torsion bar of major diameter (such as 1000mm), because wave is in bar
It is propagated on cross section and needs the long period, at the same time, wave spreads along axial direction, causes the rising edge for reversing incidence wave can not
It is precipitous, affect the raising of experiment strain rate.
Summary of the invention
For the problems of the prior art, the purpose of the present invention is to provide a kind of electromagnetism pressure-rotary split-Hopkinson torsional bar,
Make up the split-Hopkinson torsional bar of pre- energy-storage type separate type split-Hopkinson torsional bar defect existing for loading procedure and explosive driving
Defect existing for device.
To achieve the goals above, the present invention is achieved by the following scheme:
A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar, including incident bar, transmission bar and it is placed on incident bar and transmission bar phase
The test specimen in neighboring terminal portion；It further include a cylinder-shaped fixed frame, the fixed frame is disposed coaxially on the cantilevered end of incident bar,
It is fixed with several rotating vanes on the incident bar, the rotating vane is by the pulsed electricity that is arranged on the inside of fixed frame
Magnetic loader pushes, and the pulsed electromagnetism loader is electrically connected with transient state power supply group and control unit.
Preferably, described pulsed electromagnetism loader one end is fixed on the inside of fixed frame, and the other end has movable
Push-pull rod, the movable push-pull rod act on rotating vane.
Preferably, there are four rotating vane settings, respectively by four pulseds on the inside of fixed frame are arranged in
Electromagnetism loader pushes.
Compared with prior art, the present invention has following technical effect that
In the present invention, pressure is applied to rotating vane using pulsed electromagnetism loader, compensates for existing pre- energy-storage type point
From formula split-Hopkinson torsional bar, the shortcoming of the Hopkinson torsion bar device that explosive drives and T shape Hopkinson torsion bar device, greatly
Experiment difficulty is reduced greatly, greatly improves conventional efficient.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment.
Detailed description of the invention
Fig. 1 is the front view of electromagnetism pressure-rotary split-Hopkinson torsional bar provided by the invention；
Fig. 2 is the side view of electromagnetism pressure-rotary split-Hopkinson torsional bar provided by the invention；
Figure label explanation: 1- test specimen, 10- incident bar, 11- rotating vane, 20- transmission bar, 30- fixed frame, 40- arteries and veins
Rush formula electromagnetism loader, 41- cable, 50- transient state power supply group and control unit.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific attached drawing is closed, the present invention is furture elucidated.
In conjunction with shown in Fig. 1,2, the present invention provides a kind of electromagnetism pressure-rotary split-Hopkinson torsional bar, including incident bar 10, thoroughly
It penetrates bar 20 and is placed on the test specimen 1 of incident bar 10 Yu 20 adjacent end portion of transmission bar；It further include a cylinder-shaped fixed frame 30, it is described
Fixed frame 30 be disposed coaxially on the cantilevered end of incident bar 10, be fixed with several rotating vanes on the incident bar 10
11, the rotating vane 11 is pushed by the pulsed electromagnetism loader 40 for being arranged in 30 inside of fixed frame, the pulse
Formula electromagnetism loader 40 is electrically connected with transient state power supply group and control unit 50.
Heretofore described transient state power supply group and control unit 50 is one to have high voltage, heavy current and be equipped with transient state and open
The component of pass, the momentary switch are microsecond rank.
The pulsed electromagnetism loader 40, according to current-carrying conductor interaction principle, one end is fixed on fixed frame
30 insides, the other end have movable push-pull rod, and the movable push-pull rod acts on rotating vane 11.
The working principle of split-Hopkinson torsional bar provided by the invention are as follows:
Control unit in transient state power supply group and control unit 50 issues instruction first, connects high voltage, heavy current, simultaneously
Driving pulse formula electromagnetism loader 40, pulsed electromagnetism loader 40 compress rotating vane 11 simultaneously, apply one to incident bar 10
A transient state reverses wave impulse.The wave is propagated in incident bar 10 to 1 place end of test specimen, reflection and transmission occurs at test specimen 1, instead
It penetrates signal and forms the loading end that back wave is transmitted to incident bar 10 in incident bar 10；Transmission signal forms transmission wave direction transmission bar 20
Free end propagate.Incidence wave, back wave and transmitted wave are recorded, can handle to obtain 1 institute of test specimen according to one-dismensional stress wave theory
Dynamic shearing stress, dynamic shearing strain and its strain rate received, obtain stress-strain of the material for test under certain strain rate
Curve.
The present invention thoroughly compensates for existing pre- energy-storage type separate type split-Hopkinson torsional bar, the Hopkinson of explosive driving is turned round
The shortcoming of lever apparatus and T shape Hopkinson torsion bar device substantially reduces experiment difficulty, greatly improves experiment effect
Rate.
In one embodiment of the invention, there are four the rotating vane 11 settings, respectively by fixed frame is arranged in
Four pulsed electromagnetism loaders 40 of 30 inside of frame push.Extend the confession of cable 41 on the pulsed electromagnetism loader 40
It is electrically connected with transient state power supply group and control unit 50.
The working principle of heretofore described pulsed electromagnetism loader 40 is the interaction principle of current-carrying conductor, this
This will not be repeated here for invention.
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (3)
1. a kind of electromagnetism pressure-rotary split-Hopkinson torsional bar, including incident bar (10), transmission bar (20) and it is placed on incident bar (10)
With the test specimen (1) of transmission bar (20) adjacent end portion；It is characterized by also including a cylinder-shaped fixed frames (30), and described consolidates
Determine the cantilevered end that frame (30) is disposed coaxially on incident bar (10), is fixed with several rotating vanes on the incident bar (10)
(11), the rotating vane (11) is pushed by being arranged in the pulsed electromagnetism loader (40) on the inside of fixed frame (30), institute
The pulsed electromagnetism loader (40) stated is electrically connected with transient state power supply group and control unit (50).
2. electromagnetism pressure-rotary split-Hopkinson torsional bar according to claim 1, it is characterised in that: the pulsed electromagnetism adds
It carries device (40) one end to be fixed on the inside of fixed frame (30), the other end has movable push-pull rod, the movable push-pull rod
It acts on rotating vane (11).
3. electromagnetism pressure-rotary split-Hopkinson torsional bar according to claim 1, it is characterised in that: the rotating vane (11)
There are four settings, is pushed respectively by four pulsed electromagnetism loaders (40) on the inside of fixed frame (30) are arranged in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811026294.XA CN109187231A (en) | 2018-09-04 | 2018-09-04 | A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar |
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|---|---|---|---|
| CN201811026294.XA CN109187231A (en) | 2018-09-04 | 2018-09-04 | A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar |
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| CN109187231A true CN109187231A (en) | 2019-01-11 |
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| CN201811026294.XA Pending CN109187231A (en) | 2018-09-04 | 2018-09-04 | A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487119A (en) * | 2019-09-06 | 2020-08-04 | 西北工业大学 | Torsional stress wave releasing device |
| CN115452551A (en) * | 2022-08-23 | 2022-12-09 | 中国人民解放军空军工程大学 | Pneumatic Hopkinson torsion bar device and operation method |
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| US20040073385A1 (en) * | 2002-10-11 | 2004-04-15 | Kazuyoshi Miyamoto | Method of computing energy loss generated in viscoelastic material and method for evaluating energy loss of golf ball by using method of computing energy loss |
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| CN105571961A (en) * | 2015-12-18 | 2016-05-11 | 西北工业大学 | Electromagnetic induction type Hopkinson torsion and pressure bar loading device and experimental method |
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| CN106655674A (en) * | 2017-02-21 | 2017-05-10 | 中国人民解放军陆军军官学院 | Microsecond pulse torsional load motor |
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| US20040073385A1 (en) * | 2002-10-11 | 2004-04-15 | Kazuyoshi Miyamoto | Method of computing energy loss generated in viscoelastic material and method for evaluating energy loss of golf ball by using method of computing energy loss |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487119A (en) * | 2019-09-06 | 2020-08-04 | 西北工业大学 | Torsional stress wave releasing device |
| CN115452551A (en) * | 2022-08-23 | 2022-12-09 | 中国人民解放军空军工程大学 | Pneumatic Hopkinson torsion bar device and operation method |
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