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Numerical and experimental investigation of the fracture behavior of shock loaded alumina

science china(Physics,Mechanics & Astronomy) 2010年第2期53卷 244-252页

作者： ren huilan1,shu xuefeng2.& li ping3.1 state key laboratory of explosion science and technology,{2. Institute of technology,beijing 100081,china 2.Institute of Applied Mechanics and Biomedical Engineering,Taiyuan University of technology,Taiyuan 03002.,china 3 Labroratory for Shock Wave and Detonation Physics Research,Institute of Fluid Physics,CAEP,Mianyang 610059,china state key {2. of explosion science and technology Beijing Institute of Technology Beijing China Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan China Labroratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics CAEP Mianyang China

Plate impact expeiments are conducted to investigate the dynamic behavior of alumina by using one stage light gas gun. A ve-locity interferometer system for reflectors (VISAR) is used to obtain Hugoniot elastic limit and the free surface velocity profile,which consists of an elastic wave followed immediately by a dispersive inelastic wave. The stress histories under diffe{2.t impact velocities are measured by in-material manganin gauges. Based on the experimental data a Hugoniot curve is fitted,which shows the compressive characteristics that alumina changes typically from elastic to "plastic" ,and under higher pressure it will be transferred to similar-fluid state. The turning point of the Hugoniot curve from a high pressure region to a low pressure region is about 11.4 GPa. The fracture process of alumina is simulated by way of finite element code. After the analysis of the fracture mechanism,the numerical results show an important role played by the nucleation and the growth of the cracks in the macro-scopic fracture of the alumina target. The numerical predictions of stress histories are compared with the experimental results,which indicates consistency between them.

关键词： plate impact experiment hugoniot curve fracture characteristics numerical simulation

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