Constitutive modeling of ceramic matrix composites
Varun Rajan (University of California at Sa), Frank Zok ()
Materials for Extreme Environments: Multiscale Experiments and Simulations
Mon 4:20 - 5:40
Salomon 203
An approach is presented for modeling of ceramic matrix composite (CMC) laminates subject to spatially non-uniform, multiaxial states of stress. It utilizes a novel micromechanical model for the mechanical behavior of unidirectional CMCs in shear. The model reveals that fibers undergo local bending at matrix cracks: a mechanism that may govern shear fracture in these materials. It is also used to provide insight into the effects of constituent properties on the matrix cracking stress and inelastic response of CMCs in shear. The shear micromechanical model is combined with an already existing micromechanical model for the tensile response of unidirectional CMCs; the resulting stress-strain curves are used as inputs to a phenomenological model for CMC laminates. The utility of this multi-scale modeling approach is demonstrated through comparison with the results of selected experiments, each instrumented with digital image correlation.