中間層を有する三次元接着接合体の角部における熱残留応力の特異場の強さ : 中間層のヤング率を変えた場合

概要

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A mismatch of material properties may cause stress singularity, which lead to the failure of bonding part in joints. It is very important to analyze a stress singularity field for evaluating the strength of interface in three-dimensional joints. Thermal residual stresses occur in a cooling process after bonding the joints at a high temperature, and the stress singularity for thermal stresses also occurs. In the present paper, a boundary element method and an eigen value analysis based on a finite element method are used for envaluating the intensity of singularity of residual thermal stresses at a vertex in joints. Three-dimensional boundary element program based on the fundamental solution for two-phase isotoropic body is used. The singular stress field for residual thermal stresses at the vertex in three-dimensional bonded structures with an interlayer is calculated with varying material properties of interlayer. Additionally, a relationship between Dundurs' parameter a_<3D> for three-dimensional stress states and the intensity of sigularity K_<66>. Stress singularity field will be able to estimate for an arbitrary material combination in the present study using this relationship under thermal loadings.
一般社団法人日本機械学会の論文
2007-08-25