A Shell/3D Modeling Technique for Delaminations in Composite Laminates

摘要: A shell/3D modeling technique was developed for which a local solid finite element model is used only in the immediate vicinity of delamination front. The goal to combine accuracy full three-dimensional solution with computational efficiency plate or shell model. Multi-point constraints provide kinematically compatible interface between 3D and global structural has been meshed elements. For simple double cantilever beam (DCB), end notched flexure (ENF), single leg bending (SLB) specimens, mixed mode energy release rate distributions were computed across width from nonlinear analyses using virtual crack closure technique. served test pure I case II (ENF) I/II (SLB). Specimens unidirectional layup where located two 0 degrees plies, as well multidirectional non-zero degree simulated. extending minimum about three specimen thicknesses front behind front, results good agreement strain rates obtained computations entire had modeled large built-up composite structures elements, offers great potential, since relatively small section needs be