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Method for controlling pure shear strain of high-speed impact load

A high-speed impact and pure shearing technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of uncontrollable strain of the material being tested

Pending Publication Date: 2021-09-10
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0006] The invention proposes a method for controlling the pure shear strain of high-speed impact, and its purpose is to solve the problem that the existing separate Hopkinson loading device cannot control the strain of the material to be tested

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  • Method for controlling pure shear strain of high-speed impact load
  • Method for controlling pure shear strain of high-speed impact load
  • Method for controlling pure shear strain of high-speed impact load

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Embodiment Construction

[0032] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0033] The invention provides a method for controlling pure shear strain of high-speed impact load, which is applied in the process of high-speed impact to obtain predetermined pure shear strain. The method uses a high-speed impact test loading device for loading impact load and performing impact compression; the present invention is based on a Hopkinson compression bar test device, and introduces a sample device, namely a cap-shaped sample 1 and an annular pressure-bearing device 2 . The cap-shaped sample 1 provides a geometric characteristic for obtaining a pure shear state; the annular pressure-bearing device 2 bears the load after the sample reaches the set strain, effectively limiting the continuous compressive loading of the sample by subsequent loading pulses , the combination of the two achieves effective control of pure shear strain.

[0034] A method ...

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Abstract

The invention relates to a method for controlling pure shear strain of a high-speed impact load. The method comprises the steps of processing a sample to be tested into a cap-shaped sample, and setting pre-deformation d1; calculating the inner diameter dc and the height h of an annular pressure-bearing device through an annular pressure-bearing model, the outer diameter D0 of the annular pressure-bearing device being the diameter of a Hopkinson pressure bar, and manufacturing the annular pressure-bearing device; and putting a cap-shaped sample into the annular pressure-bearing device, and then putting the annular pressure-bearing device filled with the cap-shaped sample between a transmission bar and an incident bar of the Hopkinson pressure bar system to carry out a dynamic compression test. Through the cap-shaped sample and the annular pressure-bearing device, the problems that an existing split Hopkinson loading device cannot control the dependent variable of an experimental material and pure shear deformation is difficult to accurately control under a high-speed impact load are solved, and dynamic reproduction of the forming process of an adiabatic shear band or a localized deformation band is realized.

Description

technical field [0001] The invention relates to a method for controlling the pure shear strain in the high-speed impact process, in particular to a method for controlling the pure shear strain in the high-speed impact. Background technique [0002] Magnesium alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing and shipbuilding industries. With the rapid development of science and technology and industrial economy in recent years, the dynamic performance requirements of magnesium alloys are also increasing. [0003] With the extensive application of magnesium alloys, the original research on quasi-static mechanical properties and microstructures is difficult to meet the needs of magnesium alloy applications. The research on dynamic mechanical properties and microstructure evolution of magnesium alloys has become a hot research issue today. [0004] The separated H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/307G01N3/02
CPCG01N3/307G01N3/02G01N2203/0044Y02E30/30
Inventor 毛萍莉王志周乐王峰魏子淇刘正
Owner SHENYANG POLYTECHNIC UNIV
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