Abstract
Cyclic fatigue of Si3N4/SUS304 joints with copper interlayer was analyzed using the thermoelastic-plastic finite-element method (FEM). It is found that the equivalent plastic strain (ε^-p) is concentrated on the copper interlayer near the interface of the ceramic side due to the joining process. The equivalent plastic strain range (Δε^-p) is increased and the residual stresses (σx, σy) of the ceramic side are relaxed due to cyclic fatigue. Stress singularity near the interface of the ceramic side was also studied. The exponent of stress singularity (λ) and intensity of stress singularity (K) are decreased due to cyclic fatigue. Therefore, fracture originates in the copper interlayer near the interface of the ceramic side due to cyclic fatigue. It is concluded that the cyclic fatigue strength and fracture mechanism of the ceramic/metal joints are influenced by the elastic-plastic behavior of the copper interlayer.
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