Stress Calculation by Finite-Element Analysis

The mesh is built using 8-node elements. A fine mesh is used at the edges of the interface between the two materials. The calculations are performed by using ANSYS 5.5 (PLANE82-elements). Since the implementation of ANSYS is displacement-oriented, displacement-controlled boundary conditions are used. Symmetry implies that the nodes on the y-axis should be constrained, so that no displacement occurs in thex-direction. 

The following elastic properties have been used for the stress analysis Material 1, elastic modulus = 0.33 GPa, Poisson s ratio v, = 0.49 Material 2, 2=3 GPa, V2 = 0.35. The thermal residual stresses caused by the sample preparation are neglected. 

---