Multiscale progressive damage analysis of CFRP composites using a mechanics based constitutive relation

摘要

A continuum damage mechanics-based material model for the constituent phases of a carbon fiber reinforced polymer composite material is presented. This constitutive model is applied to Eigenstrain based Reduced-order Homogenization framework for multiscale modeling. A key contribution is that all model parameters are directly or indirectly calibrated using experimental data and these model parameters can be readily updated by describing the evolution of damage as a function of the strain state. The constitutive model for polymer matrix captures mixed mode from pure uniaxial to pure shear loading without using any conventional failure criterion. The accuracy of the constitutive model is demonstrated by comparing experimental results of unnotched and open-hole laminates. In addition, a demonstration is presented to alleviate spurious residual stiffness appearing from the reduction of model order of the microstructure.