Abstract
Residual stress occurred in Si3N4 to metals joints were analyzed by thermal elastic-plastic finite element method. In order to investigate the effect of the bonded material to Si3N4 on residual stress, numerical analysis were conducted on the condition simulating Si3N4-Si3N4, W, Mo, Ta, Nb or Cr-Mo steel joints with the insert layer. Maximum principal stress occurred in Si3N4 was lowering in the order of Cr-Mo steel, Nb, Ta, Mo, W, Si3N4. Maximum principal stress in Si3N4 of Si3N4 to Cr-Mo steel joints decreased with increasing the insert layer thickess in the range up to about 1.0 mm thick. As diameter of specimen increased, maximum principal stress in Si3N4 increased. Maximum principal stress in Si3N4 of Si3N4 to Cr-Mo steel joints was reduced irrespective of diameter of specimen with an increase in the thickness of W being used as the interlayer.
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