Material dynamic damage evolution experiment method of high temporal-spatial resolution

Abstract

The invention discloses a material dynamic damage evolution experiment method of a high temporal-spatial resolution. A flying sheet is controlled to hit against a large head end surface of a cone sample. After impact, a flying sheet impact compression wave and a sample impact compression wave are generated to large head surfaces of the flying sheet and the cone sample. When a sample compression wave front reaches a conical surface of the cone sample, oblique reflection is performed to form a sample sparse wave, simultaneously, a flying sheet sparse wave is spread towards a small head end direction in plane wave form in the cone sample, and forms a flying sheet sparse wave front. The sample sparse wave and the flying sheet sparse wave front encounter in the cone sample, and generate stretching stress and damages, and finally form a spall damage surface parallel to a cone bus as time goes on. The method has advantages that material dynamic stretching damage and destroy information underdifferent impulse conditions after single loading can be acquired; and a characteristic of the high temporal-spatial resolution is possessed, which is beneficial to study of a spall strength criteriontheory and investigation of microscopic damage evolution physical image information in the sample.

Description

technical field [0001] The invention relates to the performance research of materials under impact loads in the field of explosion and impact dynamics, in particular to an experimental method for dynamic damage evolution of materials with high temporal and spatial resolution. Background technique [0002] Under the action of impact load, different degrees of damage or even fracture often appear in the material, among which spallation caused by reflected unloading wave (sparse wave) is a typical tensile fracture mode common in macroscopic view. Among them, the dynamic tensile damage or fracture under the condition of one-dimensional strain is a dynamic tensile fracture behavior of a relatively simple stress state, and it is relatively easy to realize experimentally. Rich dynamic damage evolution content in the fracture process. On the other hand, the analytical techniques used in the dynamic tensile fracture experiment under one-dimensional strain are also relatively easy to...

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Problems solved by technology

At present, the research on the damage evolution or spallation strength of materials under strong dynamic loads usually takes the plate impact spallation experiment under one-dimensional strain as the research object. or the study of the influence of duration, but a single loading experiment can only obtain the information of a tensile stress amplitude and pulse width duration, and the damage inside the sample is formed by the result of multiple stretches. Therefore, in In sample recovery, only single impulse evolution damage and fuzzy damage distribution information can be obtained, which has the characteristics of low temporal and spatial resolution, which is not conducive to the study of spall strength criterion theory and the physical image information of internal mesoscopic damage evolution of the sample. study

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