Micromechanical analysis of UD CFRP composite lamina under multiaxial loading with different loading paths

The influences of loading path on the failure unidirectional (UD) carbon fibre reinforced polymer (CFRP) composite laminae IM7/8552 are studied. A 3D representative volume element (RVE) based micromechanical model is established using finite method (FEM) to capture coupled effects fibres, matrix and fibre/matrix interface under different multiaxial conditions. An artificial neural network (ANN) adopted identify experimentally difficult-to-measure micro-parameters interface, such as thickness stiffnesses, for construction high-fidelity RVE. In order precisely control with consideration Poisson’s effects, RVE loaded by force at dummy points instead commonly used displacement approach. Three paths compared in each case, results show that strength patterns combined transverse out-of-plane compressions well in-plane shear independent paths.