Efficient strength optimization of variable stiffness laminates using lamination parameters with global failure index

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