Element Splitting Algorithm Of High Velocity Impact Debris Cloud

When a projectile perforates a target plate there will often be a cloud of debris around the residual projectile behind the plate. To be able to predict the consequences of an attack one has to estimate the number of particles, their masses, velocities and directions in the cloud, as well as the residual velocity, mass and direction of the projectile. This work proposes a new method - element splitting algorithm, for simulating the process of formation of debris and debris cloud from dynamic impact events. Specifically, the prediction of fragment statistics is obtained by a two-step process:(1) a well-resolved ESIA calculation of the impact event, during which important state variables are saved in"Input"file; and (2) read"Input"file with a Fortran program, find out the deleted elements, according to the previous step element equivalent strain rate, generate debris with element splitting algorithms. Comparison of the numerical results with experimental data for the fragment size distribution and the evolution of the debris cloud have been done. The conclusions are as follows:1. The method is able to simulate the process of debris generated form high velocity impact events, the numerical results of the debris'mass and velocity distribution are good agreement with experimental results;2. The numerical results of character of the debris cloud are good agreement with the experimental results. The shape of debris cloud of ductile material is ellipsoid and the brittle material's is cone-shaped.It provides a good approach to simulate the second damage of the debris.