随机可变负载下硅塑性行为预测(英文)  

Predicting Plastic Behavior of AlN Subjected to Randomly Variable Load *

作　　者：宗祥福[1] 周正刚[1] 翁渝民 王旭[1] 唐国安 

机构地区：[1]复旦大学电子工程系

出　　处：《复旦学报（自然科学版）》1999年第3期289-293,299,共6页Journal of Fudan University：Natural Science

摘　　要：用有限元法分析了在随机加载的圆柱形刻痕器作用下氮化铝的行为，模拟了应力场的整个扩展过程．结果显示，主应力的方向总是处于不停的随机变化之中；而完全卸载时残余张应力的方向最终将趋向于平行于刻痕表面，残余压应力平行于表面．这将易于导致材料的分层断裂；最大塑性应变区并不在整个接触面下．The behavior of AlN subjected to micro indentation with random load by a cylindrical flat punch indenter was analyzed by finite element method for the first time. The development of stress field was thoroughly simulated. The directions of the principal stress fields are always in random change. The direction of the tensile residual stress field becomes perpendicular to the indentation surface whilst that of the compressive is parallel to the surface. Such a distribution may easily lead to fracture delimitation. The maximum plastic strain zone is not at the whole region of the contact interface.

关 键 词：随机可变负载 塑性行为 氮化铝 圆柱形刻痕器 残余张应力 残余压应力 有限元法 应力场 

分 类 号：O344.1[理学—固体力学]