Residual Stress in a Soft‐Buffer‐Inserted Metal/Ceramic Joint

Abstract

Residual stresses in a soft buffer layer developing during cooling of a metal/buffer/ceramic joint were analyzed. It is shown that there is a parabolic distribution for normal stress and a cubic parabola for shear stress in the buffer. The maximum shear stress, τ 12 or τ 13 , is approximately proportional to the ratio of length to thickness of the buffer, and it is far more than the normal stress σ 1 , σ 2 or σ 3 . With increasing thickness of the soft buffer, the maximum shear stress will decrease, but the normal stress will change little. A new physics parameter m is suggested in this paper to describe the beneficial role of the buffer, and the influence factors of m are also discussed.