斜冲击界面动力学研究  

On Interface Dynamics with Applications to Oblique Impact

作　　者：陈大年[1] 俞宇颖[1] 尹志华[1] 沈雄伟[1] 

机构地区：[1]宁波大学力学与材料科学研究中心,浙江宁波315211

出　　处：《爆炸与冲击》2002年第2期104-110,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目 (19972 0 2 8)

摘　　要：讨论了界面受到斜冲击时的动力学问题。有效冲击摩擦系数被处理成冲击过程及初始冲击角的函数 ;界面的法向响应描述计及弹性接触、弹性变形极限以及依赖于应变、应变率及温度的完全塑性接触 ;界面在冲击过程中的构形变化也予考虑 ,并采用平均应变、应变率及最大温升的概念与估算。这种新的斜冲击界面动力学模型用于数值模拟刚性球对于延性靶的斜冲击实验 ,计算与实验比较 。Interface dynamics with applications to oblique impact is discussed. The effective friction coefficient is designed to model the experimentally observed dependence of impact effective coefficient of friction on the impact process and the initial angle. Elastic contact, limit of elastic deformation and full plastic contact dependent on strain, strain-rate and temperature are considered in the description of normal interface response to oblique impact. The change in configuration during collision is considered and the estimation of average strain, strain rate and maximum rise in temperature are adopted. The new model of interface response to oblique impact is used to simulated the oblique impact of a hard sphere against ductile target. Some simulations of the experimental apparatus give good agreement with the experimental results.

关 键 词：界面响应 斜冲击 有效冲击摩擦系数 完全塑性接触 构形变化 延性靶 法向响应 三维有限元法 

分 类 号：O343.3[理学—固体力学] O313.5[理学—力学]