Abstract
This paper investigates the ultimate strength failure probability of composite laminates. A probabilistic progressive failure model is proposed based on system reliability theory. In this model, the overall failure of the laminate is caused by a series of ply-level failure events, such as matrix cracking and fiber breakage, and the structural stiffness matrix is modified after each failure to simulate the laminate progressive failure process. The first-order reliability method (FORM) is employed to compute the failure probability of the plylevel events. The branch-and-bound technique is used to identify the significant failure sequences. The system failure probability is computed using reliability bounding techniques.
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