Micromechanical analysis of damage mechanisms under tension of 0°-90° thin-ply composite laminates

摘要

A micromechanical model is used to investigate ply thickness effect on damage evolution of thin-ply carbon fiber reinforced laminate under transverse tensile load. Representative volume element (RVE) for 90 degrees lamina are constructed and sandwiched between two homogenized zero degree plies. Four different thicknesses for 90 degrees RVEs including 30, 60, 90, and 120 mu m are considered for analysis. The three dimensional (3D) computational micromechanics are combined with augmented finite element method (AFEM) to provide high-fidelity results of damage evolution. Random arrangement for fibers and normal distribution for interface toughness and strength are considered within RVEs. Damage evolution in different RVEs under tensile loading are discussed and compared. The results show that decreasing 90 degrees lamina thickness alters damage progression mechanism and suppresses cracking within matrix loading. A detailed comparative discussion on the influence and importance of material parameters as well as voids/defects on the process of cracking are given.