NUMERICAL SIMULATION OF DAMAGE IN CERAMIC MATRIX COMPOSITES BASED ON THE BOUNDARY ELEMENT METHOD

摘要

Based on an advanced BEM-code, a direct approach to damage in ceramic matrix composites was implemented. Damage evolution under the action of external loads is modelled by simulating the formation of micro crack patterns in a piecewise homogeneous, anisotropic, linear elastic material. Local failure is predicted in terms of fracture mechanics concepts taking also into account the stochastic nature of microcrack formation in brittle disordered materials. Thereby - besides the prediction of the macroscopic constitutive response -, an immediate insight is possible into the very complex interactions between the constituents of the hierarchic structure of those composites which govern the features of damage evolution.