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《Journal of Vibration and Shock》 2007-08
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QI Mei-lan1,2 HE Hong-liang2 WANG Yong-gang2 YAN Shi-lin1(1.School of Science, Wuhan University of Technology, wuhan 430070, China; 2.Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China)  
The dynamic evolution of micro void under different loading conditions was calculated by use of two-dimensional program LS-DYNA. The Result shows, under low impact velocity, the initial void is first compressed by the shock wave, and nearly closes. After that, the void grows bigger and bigger under the effect of tension stress due to reflection wave. The void nearly keeps a circular shape during the growth, but the shape will change with time because of the shear strain. Under higher impact velocity, the collapse of the void will occur during the process of void closing. The change curve of void after shocked by the flyer is also plotted. It is hard to observe these appearing and resulting in the experiment. The results are helpful to study the fracture of the material with voids under dynamic loading.
【Fund】: 国家自然科学基金NSAF项目(10476027)
【CateGory Index】: O347.3
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