Evaluation of Singular Stress Field at the End of the Interface of Dissimilar Materials Using Akin's Singular Element

A three-noded triangular element proposed by Akin, which has a stress singularity of O (γ^<-λ>), was investigated. A singular element was incorporated into a general-purpose finite element program MARC, in order to analyze the two-dimensional stress field of joints made up of dissimilar materlals. A typical eight-noded isoparametric element was also used to analyze the same problem. Finally, by comparing the accuracy and efficiency of the two example problems, we have shown that Akin's singular element is very useful for the analysis of the stress field at the interface of dissimilar materials.半導体パッケージのような特異応力場が多数ある構造に対してAkinが提案した特異要素を使用することを提案し，一般の要素で密な分割を行った場合と結果の精度と労力について検討した