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An Experimental Method for Stretch and Compression Bars with Medium Strain Rate

A loading experiment and strain rate technology, which is applied in the field of materials, can solve the problems such as the inability to achieve medium strain rate loading

Active Publication Date: 2021-05-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiency that the pneumatically driven Hopkinson bar device and data processing method in the prior art cannot realize medium strain rate loading, the present invention proposes a medium strain rate tensile and compression bar loading experimental method

Method used

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  • An Experimental Method for Stretch and Compression Bars with Medium Strain Rate
  • An Experimental Method for Stretch and Compression Bars with Medium Strain Rate
  • An Experimental Method for Stretch and Compression Bars with Medium Strain Rate

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Embodiment Construction

[0065] This embodiment is a method of using the medium strain rate tension and compression rod experiment based on electromagnetic force.

[0066] The loading device of the present invention adopts the loading device proposed in the invention creation with application number 201510956545.4. For medium strain rate loading, in order to generate large strain in the sample, long pulse loading is required, so the outer diameter and number of turns of the main coil are 3 to 5 times that of the ordinary Hopkinson rod loading device, and the capacitance is also the ordinary Hopkinson rod loading device. 3 to 5 times that of the Jinsen rod loading device.

[0067] The waveguide rods include two tension rods with the same length and two compression rods with the same length, one of the two waveguide rods is an incident rod, and the other is a transmission rod. The diameter of the waveguide rod is 10-20mm, and the length is 20-50cm. The tensile rod is a cylindrical rod, one end is proc...

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Abstract

A medium strain rate tension and compression rod loading experiment method, which uses the principle of electromagnetic energy / mechanical energy conversion to generate and load stress waves. The amplitude and pulse width of the generated stress waves are only limited by electromagnetic energy, so there is no bullet length. limitations, reducing the size of the mechanism. Secondly, when the medium strain rate is loaded, the wave propagation effect is already very weak. In the present invention, both the incident rod and the transmission rod are made of rods shorter than the stress pulse, ignoring the reflection effect of the stress wave, and can measure the internal force of the sample. The stress value, the strain of the specimen can be measured by the optical measurement method or the strain gauge method.

Description

technical field [0001] The invention relates to an experimental method for testing mechanical properties at medium strain rates in the field of materials, in particular to an experimental method for medium strain rate materials based on electromagnetic force. Background technique [0002] At present, in the field of material science, the most widely used methods for measuring the mechanical properties of materials under high strain rates are split Hopkinson compression rod technology and tension rod technology. The equipment for measuring the quasi-static mechanical properties of materials includes quasi-static testing machines. However, there is no relatively complete equipment for the medium strain rate mechanical properties of materials, and most of them are realized by hydrostatic pressure testing machines. [0003] In the 1960s, in order to solve the problems existing in ordinary riveting, the Boeing Company of the United States began to study electromagnetic riveting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0019G01N2203/005G01N2203/0075
Inventor 李玉龙郭翔聂海亮
Owner NORTHWESTERN POLYTECHNICAL UNIV