Microscale damage evolutions in fiber-reinforced composites with different initial defects

In this study, an effective microscale model for fiber-reinforced composites with initial damages is presented to investigate local stress distribution and damage evolution at constitutive material level. To validate the proposed numerical model, experimental data of uniaxial stress–strain responses off-axis failure strength are employed a comparison, good agreement by comparing results can be found. represent in representative volume element, stiffness degradation coefficients subtly applied describe sub-cells. Moreover, evolutions subjected biaxial loads both investigated. The effect three different modes studied. influences distribution, location orientation on also