Invited Speaker

Abstract: In this work, we proposed a new framework to simulate various material degradation mechanism of fibrous composite material with a triple-damage-model. The model is derived based on an inter- and intra-laminar decomposition. The inter-laminar model states the delamination behavior through the thickness, with fracture toughness in the normal and two tangential directions. Besides, analytical solutions for these fracture toughness are given in this work based on the fracture toughness of the matrix phase. On the other hand, the intra-laminar model is described by the reduced-order-homogenization method, where the fiber phase is described by the classic continuum damage model driven by longitudinal strain of the fiber, and the degradation of the matrix phase is stated by the phase field method. The damage state variables for the delamination, the fiber and the matrix phases form the triple-damage-model, which is numerically implemented by user-defined element under Abaqus environment. A number of numerical examples are performed to verify and validate the method, including uniform strain, double cantilever beam (DCB), end-notched flexure (ENF), mixed-mode bending test (MMB) as well as open hole tension (OCT) test of a four-layer composite laminates.

Keywords: Fibrous composite material, intra- and inter-laminar, continuum damage mechanics, phase field method, reduced-order-homogenization