セラミックス/金属接合残留応力の有限要素解析の基礎的検討 : 残留応力の弾塑性特異性に及ぼす中間層の厚さの影響

抄録

In general, a very thin metal with low yield strength is inserted into a ceramic/metal joint as an interlayer to reduce the residual stresses. A two-dimensional finite-element analysis was performed to study the effect of the thickness of the interlayer on an elastic-plastic singularity of residual stresses in the ceramic/metal joint. The yielding of the interlayer caused the change of the singularity. In the case of the joint with a relatively thick interlayer, the exponent of the elastic-plastic singularity depends on only the elastic-plastic properties of the materials. When the interlayer is very thin, however, the exponent depends on not only the elastic-plastic properties but also the thickness of the interlayer. This elastic-plastic singularity can be approximately estimated by a simplified elastic-plastic analysis.