Dynamic dual-shaft two-way stretch loading device and experiment method

A biaxial stretching and loading device technology, which is applied to measuring devices, instruments, scientific instruments, etc., can solve problems such as the inability to realize simultaneous loading of biaxial and bidirectional stress waves

Active Publication Date: 2018-07-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the invention of the present invention is to provide a dynamic biaxial bidirectional tension loading device, specifically a separate Hopkinson rod loading device and experimental method f...

Method used

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  • Dynamic dual-shaft two-way stretch loading device and experiment method
  • Dynamic dual-shaft two-way stretch loading device and experiment method
  • Dynamic dual-shaft two-way stretch loading device and experiment method

Examples

Experimental program
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Embodiment

[0057] This embodiment is a separate Hopkinson rod experimental device with electromagnetic induction biaxial bidirectional loading, including a control module 1, a main circuit charging and discharging module 2, a horizontal capacitor bank 3, a longitudinal capacitor bank 4 and a loading platform module.

[0058] In this embodiment, the control module mainly includes a circuit board, a PLC, a synchronous transformer, a pulse transformer, an electromagnetic relay, a delay signal generator, and the like. Siemens S7-200SMART series PLC and Siemens SMART 1000IE touch screen are used as the core of the loading control module to realize the control of the entire electromagnetic loading workflow. The delay signal generator adopts the DG645 digital delay pulse generator of Stanford Research Systems Company, which respectively triggers the discharge circuit corresponding to each loading gun according to the delay time setting.

[0059] The main circuit charging and discharging module ...

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Abstract

The invention relates to a device and method for testing mechanic performance of materials under dynamic dual-shaft two-way loading, in particular to a dynamic dual-shaft two-way stretch loading device and an experiment method. The dynamic dual-shaft two-way stretch loading device comprises a control module, a main circuit charging and discharging module, a capacitor set module and a loading platform module, wherein the loading platform module comprises four identical loading guns and four waveguide rods with the same length, the identical loading guns conduct stress wave loading on a specimenin four directions, transverse loading and longitudinal loading are perpendicular, stress waves generated in the same axial direction share the same amplitude and pulse width, and thus the errors generated in waveforms and times in the propagation process of the stress waves are reduced; meanwhile, it is guaranteed that the specimen is in a dual-shaft stress state, the stress state in the specimen is also symmetrically distributed, and the influence of shearing strength components in the loading process is reduced. By means of the dynamic dual-shaft two-way stretch loading device and the experiment method, the problem in the prior art that synchronous loading of the dual-shaft two-way stress waves cannot be achieved can be solved.

Description

technical field [0001] The invention relates to a device and method for testing the mechanical properties of materials under dynamic biaxial and bidirectional loading. Jinsen Tie Rod Experimental Apparatus and Experimental Method. Background technique [0002] The separated Hopkinson rod test technique is the main experimental method for studying the mechanical properties of materials under medium and high strain rates. The basic principle of this method is: a short sample is placed between two tension rods or compression rods, and a tensile stress wave or a compressive stress wave is input to the incident rod in a certain way to load the sample. Simultaneously, the pulse signal is recorded by using the strain gauge glued on the tie rod or the pressure rod at a certain distance from the end of the rod. If the tension or compression rod remains elastic, the pulses in the rod will propagate at the elastic wave velocity without distortion. In this way, the strain gauge paste...

Claims

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Application Information

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IPC IPC(8): G01N3/317
CPCG01N3/317G01N2203/005G01N2203/0254
Inventor 李玉龙金康华刘琛琳聂海亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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