Abstract
For a successful study on strength evaluation of ceramic-metal joints with interface crack based on interfacial fracture mechanics, there is a study by Yuuki et al. [1] on Si3N4/Mo joints. In this study, they assumed that a metal was elastic, since Mo had a high yield stress. However, in the actual ceramic-metal joints, the soft metal layer such as copper and aluminum is generally inserted between a ceramics and a joint metal, in order to decrease a thermal residual stress by plastic deformation of soft metal. In this problem, it is necessary to evaluate the strength considering the plastic deformation of the soft metal layer and the joint metal. But the strength evaluation method of this problem have not been found, since the interfacial fracture mechanics considering plasticity has not been established yet.
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