Effect of compressibility on the hypervelocity penetration

作     者：W.J.Song X.W.Chen P.Chen 

作者机构：Department of Mechanics and Engineering Science College of Engineering Peking University Advanced Research Institute for Multidisciplinary ScienceBeijing Institute of Technology The State Key Lab of Explosion Science and TechnologyBeijing Institute of Technology Centre for Applied Physics and Technology (CAPT) Peking University 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2018年第34卷第1期

页      面：82-98页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：China Academy of Engineering Physics, CAEP National Outstanding Youth Foundation of China, (11225213) 

主　　题：Compressibility Hypervelocity penetration Equation of state(EOS) Shockwave Bernoulli equation 

摘      要：We further consider the effect of rod strength by employing the compressible penetration model to study the effect of compressibility on hypervelocity ***, we define different instances of penetration efficiency in various modified models and compare these penetration efficiencies to identify the effects of different factors in the compressible model. To systematically discuss the effect of compressibility in different metallic rod-target combinations, we construct three cases, i.e., the penetrations by the more compressible rod into the less compressible target, rod into the analogously compressible target, and the less compressible rod into the more compressible target. The effects of volumetric strain, internal energy, and strength on the penetration efficiency are analyzed simultaneously. It indicates that the compressibility of the rod and target increases the pressure at the rod/target interface. The more compressible rod/target has larger volumetric strain and higher internal energy. Both the larger volumetric strain and higher strength enhance the penetration or anti-penetration ability. On the other hand, the higher internal energy weakens the penetration or anti-penetration ability. The two trends conflict, but the volumetric strain dominates in the variation of the penetration efficiency, which would not approach the hydrodynamic limit if the rod and target are not analogously compressible. However, if the compressibility of the rod and target is analogous, it has little effect on the penetration efficiency.