Effects of processing induced residual stresses on damage dependent micromechanics of metal matrix composites

A computational scheme is utilized herein to perform micromechanics analysis of a SiC/Ti continuous fiber laminated composite for the purpose of gaining insight into the selection of initiation criteria for damage in the form of radial cracks. The analysis assumes that the matrix can be modeled effectively as an isotropic thermoviscoplastic medium, and that an elastic interphase exists adjacent to the fiber. Analyses indicate that although inelastic behavior occurs during cool down from the processing temperature, the residual stresses induced by thermal expansion mismatch between fiber and matrix are little affected in the process zone by matrix inelasticity. However, once mechanical loading is applied in the presence of residual thermal stresses there is a marked difference in the elastic and viscoplastic analyses.

Effects of processing induced residual stresses on damage dependent micromechanics of metal matrix composites Conference Paper