MODELING IMPACT FAILURE OF POLYCRYSTALLINE MICROSTRUCTURES: POWER DIAGRAMS VS. PARTICLES
Two different strategies of investigating the shock wave failure of brittle granular materials such as polycrystalline ceramics upon impact are proposed. In a first approach, impact failure behavior is modeled within the framework of classical particle dynamics. Here, instead of trying to mimic the geometrical shape of polyhedral grains on the microscale, the solid is modeled as unordered network soft particles, connected by non-linear elements which are allowed to break upon a given load. Alternatively, in a second approach to modeling granular microstructures in three dimensions, the theory of power diagrams is used to generate polyhedral cell complexes which are subsequently optimized against experimental data using a reverse Monte-Carlo scheme. The proposed optimization scheme which results in very realistic grain structures in three dimensions is based on the moments of the grains area and perimeter distributions. As a proof of principle we present shock-impact simulations of the obtained polycrystalline structures.
Martin O. Steinhauser
Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut EMI Eckerstrasse 4, 79104 Freiburg Department of Composite Structures
国际会议
25th International Symposium on Ballistics(第25届国际弹道会议)
北京
英文
1477-1484
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）