TY - EJOU AU - Yang, Pengfei AU - Liu, Yan AU - Zhang, Xiong AU - Zhou, Xu AU - Zhao, Yuli TI - Simulation of Fragmentation with Material Point Method Based on Gurson Model and Random Failure T2 - Computer Modeling in Engineering \& Sciences PY - 2012 VL - 85 IS - 3 SN - 1526-1506 AB - The material point method is extended to the simulations of fragmentation driven by detonation. A crack modeling scheme based on contact algorithm with material failure process is developed to study the dynamic crack propagation in plastic media. When considering microscopic damage of material, the plastic behavior is described by Gurson model with randomly-distributed initial void of material points. Gurson model can degenerate to J2 plastic theory while the microscopic void is ignored, in which situation the Weibull random failure scheme will be used. Meanwhile, a background-grid-based searching method is proposed to capture the statistical feature of the fragmentation. The scaling of the fragments in simulation tends to exhibit the same law as that in the experiment. It is found that the material point method possesses great potential for simulating high strain-rate, large deformation fragmentation phenomena. KW - material point method KW - fragmentation KW - Gurson model KW - Weibull random KW - material failure DO - 10.3970/cmes.2012.085.207