Electromagnetic torsional split-Hopkinson bar loading device

A loading device, electromagnetic technology, applied in the field of electromagnetic Hopkinson torsion bar loading device, can solve problems such as inability to control stress waves, and achieve simple operation, strong controllability, and good repeatability

Active Publication Date: 2015-09-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the inability to control the stress wave existing in the pri...

Method used

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  • Electromagnetic torsional split-Hopkinson bar loading device
  • Electromagnetic torsional split-Hopkinson bar loading device
  • Electromagnetic torsional split-Hopkinson bar loading device

Examples

Experimental program
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Embodiment Construction

[0038] This embodiment is an electromagnetic Hopkinson torsion bar loading device and test method.

[0039] The electromagnetic Hopkinson torsion bar loading device includes a power supply 4 , an electric energy storage and release device 3 and a torsion gun 2 . Wherein, the torsion gun includes a rotor 7, the joints 22 of the four stators 6 in the torsion gun are connected in series with wires to form a coil group, and the positive and negative terminals of the coils are respectively connected to the electric energy storage and release device 3 The positive output line and the negative output line are connected. The power supply 4 adopts 380V industrial three-phase alternating current.

[0040] In this embodiment, the electric energy storage and release device 3 adopts the power supply part of the electromagnetic riveting equipment published in the patent No. 200520079179, and the power supply part of the electromagnetic riveting includes a capacitor box and a control box. ...

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PUM

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Abstract

Disclosed is an electromagnetic torsional split-Hopkinson bar loading device, which comprises power supplies, an electric energy storing and releasing device, and a torsional gun. The torsional gun communicates with the electric energy storing and releasing device via conducting wires, and the electric energy storing and releasing device communicates with power supplies. The electric energy storing and releasing device is used for supplying an instantaneous strong current to a stator coil of the torsional gun, so that the stator coil generates electromagnetic force to a rotator on a permanent magnet, and the rotator is allowed to rotate to generate an instantaneous torque. The torsional gun is composed of the stator and the rotator, generates the instantaneous torque, converts the instantaneous torque into a torsional wave, and outputs the torsional wave to a torsional split-Hopkinson bar via a rotor shaft. The amplitude of a torsional stress actually generated is controlled via the charging voltage of the electric energy storing and releasing device, and the width of a torsional stress wave actually generated is controlled by adjusting the capacitance of the electric energy storing and releasing device. A conventional torsional split-Hopkinson bar sample is adopted, and torsion loading of a material can be performed at an anticipated pulse amplitude and pulse width. The whole device is simple to operate and has strong controllability.

Description

technical field [0001] The invention relates to a loading device and an experimental method for testing the dynamic torsional mechanical properties of materials, in particular to an electromagnetic Hopkinson torsion bar loading device and a testing method, and the device can be used as a loading device for a separate Hopkinson torsion bar experiment device. Background technique [0002] Although Hopkinson tension and compression equipment has been widely used to measure the mechanical properties of materials under high strain rate compression and tension. However, both the compression rod and the tension rod adopt the axial loading method. When the compression and tension longitudinal waves propagate, the waveguide rod is accompanied by mirror deformation, which produces a transverse inertia effect, resulting in wave dispersion and friction on the end surface of the sample, which affects the accuracy; while torsion The Hopkinson experimental equipment has no three-dimension...

Claims

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Application Information

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IPC IPC(8): G01N3/26
Inventor 李玉龙聂海亮索涛郭伟国汤忠斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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