セラミックス/金属接合材の特異応力場の弾塑性有限要素解析

概要

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Singular stress analysis of a Si_3N_4/SUS304 joint with a copper sheet as the interlayer was performed for tensile and 4-point bending specimens with and without residual stress using the elastic-plastic finite-element method (FEM). It was found that the superposition principle is not applicable, by summing loading and residual stresses. The singular stress on the ceramic side near the interface can be expressed in the form of σ=K/x^λ (x : distance from interface). The values of the exponen λ and the intensity coefficient K were examined. With increasing loading stress, λ and Kvary nonlinearly reflecting the change of the plastic zone size in the interlayer. However, after the general yielding of the interlayer, λ becomes constant and K increases linearly for both cases with and without residual stress. A fracture assessment diagram on the λ - K plot is proposed to evaluate the crack initiation in a ceramic/metal joint.
一般社団法人日本機械学会の論文
1994-09-25