Modeling of blast and impact effects with meshfree method
A meshfree formulation suitable for modeling fragmentation of structures induced by blast and impact loads is developed in this research. It has been attracting a lot of interests in the society of computational mechanics to analyze weapon-target interaction problems. This class of problems is difficult for finite element method due to its regularization requirements, which is related to mesh distortion in the large deformation problems. On the other hand, meshfree particle method has been successfully applied to many large deformation structural problems 1, 2. It has also shown some promises in handling the complex physics problems such as the penetration and fragmentation problems with conventional munitions. Therefore, meshfree particle method is employed in modeling impact penetration and fragmentation problems in this research. An advanced material model, namely, K&C concrete model 3, is implemented under the framework of meshfree method for modeling concrete materials, which are widely used in structures. Both Lagrangian and semi-Lagrangian formulations 4, 5 are constructed for the meshfree method. Impact induced penetration and blast induced fragmentation problems are simulated by the semi-Lagrangian and Lagrangian meshfree formulations, respectively. The penetration and fragmentation phenomena are properly captured by the meshfree formulation developed in this work.
Youcai Wu John E. Crawford Hyung Jin Choi
Karagozian & Case, 2550 N Hollywood Way, Suite 500, Burbank, CA 91505, U.S.A
国际会议
南京
英文
143
2009-10-12（万方平台首次上网日期，不代表论文的发表时间）