双材料界面Ⅰ型扩展裂纹尖端的弹黏塑性场  

THE ELASTIC-VISCOPLASTIC FIELD NEAR MODE I DYNAMIC PROPAGATING CRACK-TIP OF INTERFACE IN DOUBLE DISSIMILAR MATERIALS

作　　者：王振清[1] 梁文彦[1] 吕红庆 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院智能结构与先进复合材料实验室,哈尔滨150001

出　　处：《力学学报》2011年第2期417-422,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：中国高校基本科研业务费专项基金(HEUCF20100201;HEUCF100204);哈尔滨工程大学基础研究基金(HEUFT07005)资助项目~~

摘　　要：双材料界面中存在材料黏性效应,对界面裂纹尖端场的分布和界面本身性能的变化起着重要的影响.考虑裂纹尖端的奇异性,建立了双材料界面扩展裂纹尖端的弹黏塑性控制方程.引入界面裂纹尖端的位移势函数和边界条件,对刚性-弹黏塑性界面I型界面裂纹进行了数值分析,求得了界面裂纹尖端应力应变场,并讨论了界面裂纹尖端场随各影响参数的变化规律.计算结果表明,黏性效应是研究界面扩展裂纹尖端场时的一个主要因素,界面裂纹尖端为弹黏塑性场,其场受材料的黏性系数、马赫数和奇异性指数控制.The existence of viscosity effect at the interface of double dissimilar materials has an important impact to the distribution of interface crack-tip field and the properties variety of the interface itself.The singularity is considered in crack-tip,and the elastic-viscoplastic governing equations of double dissimilar materials at interface crack-tip field are established.The displacement potential function and boundary condition of interface crack-tip are introduced,and the numerical analysis of rigid-elastic viscoplastic interface for modeⅠwas worked out.The stress-strain fields are obtained at the crack-tip and the variations of solutions are discussed according to each parameter.The numerical results show that the viscosity effect is a main factor of interface propagating crack-tip field,and the interface crack-tip is elastic-viscoplastic field that is governed by viscosity coefficient,Mach number and singular factor.

关 键 词：界面裂纹 黏性效应 动态扩展 弹黏塑性材料 

分 类 号：O346.1[理学—固体力学]