Cyclic Fatigue Characteristics and Crack Extension of a Ceramic/Metal Joint

抄録

Fatigue strength and crack propagation characteristics of ceramic/metal joints were investigated under cyclic bending loading. Fracture surfaces were examined by SEM and X-ray methods. Fatigue fracture occurred at the metal/interlayer interface as well as the ceramic/interlayer interface. Fatigue strength was independent of the fracture path. Fatigue crack initiated and grew on the ceramic/interlayer interface at the specimen corner. Under constant amplitude cyclic loading, the fatigue crack decelerated and finally halted. Under increasing amplitude cyclic loading, the final fracture occurred at the metal/interlayer interface. Even under cyclic compressive loading, fatigue cracks were initiated on the ceramic/interlayer interface.