An Experimental Method for Dynamic Damage Evolution of Materials with High Temporal and Spatial Resolution

Abstract

The invention discloses an experimental method for dynamic damage evolution of materials with high temporal and spatial resolution, which is characterized in that flying pieces are controlled to hit the big end face of a conical sample, and after the impact, flying pieces are respectively produced on the flying piece and the big head surface of the conical sample Shock compression wave and sample shock compression wave. When the sample compression wave front reaches the conical surface of the conical sample, it is obliquely reflected to form a sample sparse wave. At the same time, the flyer sparse wave is in the form of a plane wave in the conical sample. It propagates toward the small head end and forms the sparse wave front of the flyer. The sparse wave of the sample and the sparse wave front of the flyer meet in the conical sample to generate tensile stress and damage. As time goes by, Finally, a spallation damage surface parallel to the generatrix of the cone surface is formed; the advantage is that the information of dynamic tensile damage and destruction of materials under different impulse conditions after a single loading can be obtained, and it has the characteristics of high temporal and spatial resolution, which is beneficial to the spallation strength criterion Theoretical research and the investigation of the physical image information of the mesoscopic damage evolution inside 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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