Effect of Sigularity in Stress Field on Optimum Shape of Ceramics/Metal Joint(Mechanics, Strength & Structural Design)

概要

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Due to their brittleness and poor machinability, ceramics are used in the form of composite structure with metals. However, stress concentration occurs is the region near the edge of interface between the ceramics and the metal. Such high stress may cause cracking of ceramics under thermal loads and reduce the reliability under external loads. In general, the stress concentration greatly depends on the geometry or the shape of the joint. The authors have proposed a shape optimization procedure based on the reliability estimation and demonstrated the possibility of reducing the failure probability through controlling the shape of the joint in the previous report. However, the stress field near the edge of the interface exhibits a singularity. It is also known that the strength of singularity changes with the geometry of the joint. The relation between the singularity and the failure probability and that between the strength of singularity and the optimum shape were not discussed in the previous report. Thus, these points are focused in this report. Further, the primary factor which is the most effective to reduce the failure probability is investigated.
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