Abstract
The effect of cyclic fatigue on residual stresses of Si3N4/SUS304 joints with copper interlayer was analyzed for 4-point bending specimens using the three-dimensional elastic-plastic finite-element method (FEM). The residual stresses were found to relax due to cyclic fatigue, which was consistent with the results of residual stress measurement by the X-ray diffraction method. The relaxation of residual stresses of the joints and equivalent plastic strain of the copper interlayer increase due to cyclic fatigue. Accordingly, the relaxation of residual stresses is thought to be caused by the elastic-plastic behavior of the copper interlayer. Bending tests were performed after cyclic fatigue and measurement of the residual stresses. The bending strength was found to increase with the decrease of residual stresses due to cyclic fatigue.
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