Abstract
The mechanical responses of composite structures are dependent on the parameter uncertainties, such as fiber orientations, ply thicknesses, and applied loads. In view of these problems, a universal gray system approach is applied to accurately reflect the impact of parameter uncertainties on the failure load and the initial damage of composite laminates. Deterministic failure criteria of composite laminates is modified based on nonlinear behavior and maximum stress criteria. The user subroutines USDFLD in Abaqus are used to modify the linear elastic material behavior. The maximum range of failure indexes are obtained and the lower and upper bounds of the uncertain parameters are drawn based on progressive failure method and universal gray system approach. The proposed method is then demonstrated by considering an open-hole composite laminate subjected to different types of load conditions. The results indicate that the framework can find the ranges of exact failure probability distributions in an efficient and accurate manner.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call