Abstract
This study presents a theory for investigating composite laminates with 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 in terfaces. The ISST consists of the Interlaminar Shear Stress Continuity Theory (ISSCT) and a shear slip theory. It has been proved to be feasible for studying composite laminates 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.
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