RESIDUAL-STRESS ANALYSIS OF BIMATERIAL STRIPS UNDER MULTIPLE THERMAL LOADING

The residual stress distribution in bimaterial beams induced by multip le thermal loadings has been investigated. Three models for the nonlin ear stress-strain material behavior were considered: bilinear elastic- plastic, power law elastic-plastic, and power law purely plastic. The equations governing equilibrium, compatibility of strain, and stress-s train for the bimaterial configuration make up a system of nonlinear a lgebraic equations which is solved numerically. The elastic-plastic po wer law model leads to stress discontinuity in the layers. The other t wo models have been verified with a finite element analysis. Several e xamples are included using materials common to the microelectronics in dustry.