NASTRAN COHESIVE ZONE MODELING OF COMPOSITE BONDED JOINTS

摘要

A computationally efficient method for modeling delamination initiation and propagation inrncomposite bonded joints is presented to aid in aircraft structural analysis. The modeling strategyrnincorporates the following state of the art finite element technologies to accurately capture therncomplex damage mechanisms in bonded composite joints: cohesive zone modeling (CZM),rnthree-dimensional layered solid elements, and micromechanics-based damage degradation.rnSimulation results are presented for a Double Cantilevered Beam (DCB) Mode I Fracture Testrnand a Mixed Mode Skin Stiffener Tension Test, and compared to experimental data fromrntechnical publications.