Progressive delamination analysis of composite materials using XFEM and a discrete damage zone model

摘要: The modeling of progressive delamination by means a discrete damage zone model within the extended finite element method is investigated. This framework allows for both bulk and interface damages to be conveniently traced, regardless underlying mesh alignment. For interfaces, new mixed-mode force---separation relation, which accounts coupled interaction between opening sliding modes, proposed. based on concept Continuum Damage Mechanics shown thermodynamically consistent. An integral-type nonlocal adopted in regularize softening material response. resulting nonlinear equations are solved using Newton scheme with dissipation-based arc-length constraint, an analytical Jacobian derived. Several benchmark studies, as well failure analyses fiber/epoxy unit cell, presented discussed detail. proposed validated against available analytical/experimental data found robust insensitive.