两种材料界面裂纹的应力强度因子
STRESS INTENSITY FACTOR OF A CRACK AT THE BI-MATERIAL INTERFACE
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摘要: 选用复变函数的幂级数作为应力函数,分析在两种材料界面上存在裂纹的情况。利用裂纹自由表面力的边界条件及材料界面上的连续条件求得特征值及待定系数之间的关系式,从而求得应力、位移及应力强度因子表达式。本文修改了Lin[1]和Mar[2]的应力函数表达式,使所得应力、位移表达式与Williams[6]及Sih—Rice[3,4]结果一致。基于上述解析解建立了裂纹尖端的奇异元。并以含有界面中心裂纹平板拉伸情况作为计算实例。Abstract: An analysis using complex exponential series is developed for the problem of a crack on the boundary between two dissimilar materials.The eigenvalues and the relations among the complex constants are determined by the use of crack face boundary conditions and the continuity conditions at the interface.From these results the stress and displacement fields and the stress intensity factors have been determined,the stress function used by Lin[1] and by Lin and Mar[2] are modified and the solution reduces to results obtained by Williams[6] and by Sih and Rice[3,4].A singular element based on the results is used to develop a finite element analysis of finite tension sheet with a central crack on a straight interface boundary.
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