Finite element simulation of nonlinear deformation of carbon/carbon-fiber reinforced composites

The mechanical properties of a 2D continuous fiber reinforced Carbon/Carbon-composite are described with a macroscopic model. The chosen material is representative for ceramic matrix composites which are damage tolerant because of a porous and weak matrix and not because of a weak fiber matrix interphase. Occurring damage of the matrix and inelastic deformation of the composite are modeled and the corresponding equations are included to the finite-element-program MARC in order to calculate the stress-strain behavior dependent on different angles between loading direction and fiber orientation. Thus, the behavior in tensile, shear and mixed tensile-shear loading can be predicted.