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• W4288901805 abstract "• An efficient and robust strength optimization method for novel composite laminates. • A global Tsai-Wu oriented failure index is built to aggregate strength measurement. • A lamination-parameter-based approximation, ensuring smooth convergence, is derived. • Benchmark tests confirm the superiority of the global approach to the local-based one. A computationally-efficient strength optimization method tailoring novel composite laminates using lamination parameters is developed. The method adopts a global p -norm approach to aggregate local failure indices into a global failure index, based on the Tsai-Wu failure criterion. For design purposes, the novel composite laminates are characterized via lamination parameters that can subsequently be transformed into locally variable fiber orientations in an existing three-step optimization method. An elliptical formulation of the conservative failure envelope is applied to represent the Tsai-Wu criterion in terms of lamination parameters. A lamination-parameter-based two-level approximation for the global failure index is derived, which guarantees the anticipated conservativeness and convexity in a gradient-based optimization framework. Numerical results show that the computational efficiency of the proposed strength optimization method improves remarkably with a proper value of p , compared to the existing local-based min-max method. The method is also shown to be robust and generate converged optimum designs even in the presence of stress concentrations and singularities." @default.
• W4288901805 created "2022-07-31" @default.
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• W4288901805 date "2022-10-01" @default.
• W4288901805 modified "2023-10-05" @default.
• W4288901805 title "Efficient strength optimization of variable stiffness laminates using lamination parameters with global failure index" @default.
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• W4288901805 doi "https://doi.org/10.1016/j.compstruc.2022.106856" @default.
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