Dynamic damage experimental method based on dynamic tensile strain rate serving as single variable

Abstract

The invention provides a dynamic damage experimental method based on the dynamic tensile strain rate serving as a single variable, and relates to the field of impact dynamics. The dynamic damage experimental method includes S1, producing a plurality of flying sheets; S2, producing a plurality of sample targets, wherein the thickness difference value between a first sample target body and a second sample target body of each sample target is the same; S3, corresponding the flying sheets to the sample targets one to one to form a plurality of impact experiment groups, wherein the ratios of the thicknesses of the flying sheets in the impact experiment groups to the total thicknesses of the sample target bodies are the same, and the sums of the thicknesses of the flying sheets in the impact experiment groups and the total thicknesses of the sample target bodies are different; S4, performing impact experiments on the impact experiment groups; S5, measuring post-impact data and analyzing results. The dynamic damage experimental method has the advantages that the difficulty in strain rate effect theoretical analysis can be remarkably lowered, and the method is more suitable for research on dynamics processes and rules in the early stage of dynamic strain damage evolution.

Description

technical field [0001] The invention relates to the field of impact dynamics, in particular to a dynamic damage experiment method with a single variable of dynamic tensile strain rate. Background technique [0002] Impact dynamics is a branch of mechanics based on mechanics, materials science, and physics. The main research object is the dynamic behavior and structural characteristics of materials under impact loads, including the movement and deformation of material components under dynamic loads. , damage and failure. The main application fields are: blasting engineering, drilling and mining, mechanical processing, underwater explosive cutting, weapon engineering, etc. [0003] In impact dynamics, according to the different applied loads, the fracture forms of materials are mainly divided into tensile fracture and shear fracture. These are the two main directions of dynamic fracture research. Obviously, when a material member is broken by tensile stress, it is called te...

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Problems solved by technology

[0006] However, in the existing experimental process, it is found that the dynamic tensile strain rate of material damage under dynamic loading is studied through the change of the collision velocity between the flyer and the sample or the thickness of the flyer and the sample. The dynamic tensile strain rate in the experiment is There is a large deviation between the spalling change caused by the change and the same value of the theoretical dynamic tensile strain rate change, which seriously affects the accuracy of the plane impact test and the subsequent processing of the data.

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