Fragment Identification and Statistics Method of Hypervelocity Impact SPH Simulation  

作　　者：ZHANG Xiaotian JIA Guanghui HUANG Hai 

机构地区：[1]School of Astronautics, Beo'ing University of Aeronautics and Astronautics, Beijing 100191, China

出　　处：《Chinese Journal of Aeronautics》2011年第1期18-24,共7页中国航空学报（英文版）

摘　　要：A comprehensive treatment to the fragment identification and statistics for the smoothed particle hydrodynamics （SPH） simulation of hypervelocity impact is presented. Based on SPH method, combined with finite element method （FEM）, the computation is performed. The fragments are identified by a new pre- and post-processing algorithm and then converted into a binary graph. The number of fragments and the attached SPH particles are determined by counting the quantity of connected domains on the binary graph. The size, velocity vector and mass of each fragment are calculated by the particles’ summation and weighted average. The dependence of this method on finite element edge length and simulation terminal time is discussed. An example of tungsten rods impacting steel plates is given for calibration. The computation results match experiments well and demonstrate the effectiveness of this method.A comprehensive treatment to the fragment identification and statistics for the smoothed particle hydrodynamics （SPH） simulation of hypervelocity impact is presented. Based on SPH method, combined with finite element method （FEM）, the computation is performed. The fragments are identified by a new pre- and post-processing algorithm and then converted into a binary graph. The number of fragments and the attached SPH particles are determined by counting the quantity of connected domains on the binary graph. The size, velocity vector and mass of each fragment are calculated by the particles’ summation and weighted average. The dependence of this method on finite element edge length and simulation terminal time is discussed. An example of tungsten rods impacting steel plates is given for calibration. The computation results match experiments well and demonstrate the effectiveness of this method.

关 键 词：IMPACT SIMULATION smoothed particle hydrodynamics FRAGMENT HYPERVELOCITY 

分 类 号：TP334.2[自动化与计算机技术—计算机系统结构] O35[自动化与计算机技术—计算机科学与技术]