ALL INTERLAMINAR BONDING THEORY FOR DELAMINATION AND NONRIGID INTERFACE ANALYSIS

This study presents a theory for investigating composite laminates wit h delamination or nonrigid interfaces. It is extended from a previous study, the so-called Interlayer Shear Slip Theory (ISST), in examining composite laminates with shear slip interfaces. The ISST consists of the Interlaminar Shear Stress Continuity Theory (ISSCT) and a shear sl ip theory. It has been proved to be feasible for studying composite la minates with shearing-mode (mode II and mode III) fractures. Based on a previous study on the Interlaminar Stresses Continuity Theory (ISCT) , the present study adds both shear slip and normal separation to the composite interfaces. It then is useful for studying open-mode (mode I ) and mixed-mode fracture problems.