Accurate equilibrium-based interlaminar stress recovery for isogeometric laminated composite Kirchhoff plates

Despite the accelerated deployment of laminated composites in a wide variety markets due to their peculiar engineering features, design those materials is often restrained by lack cost-efficient modeling techniques. In fact, existing strategies allowing for cheap simulations usually fail directly capture out-of-plane through-the-thickness stresses, which prove be typically responsible delamination failure modes. this paper, we introduce fast and accurate stress recovery strategy model behavior Kirchhoff plates. The proposed technique can regarded as two-step approach: First, classical composite plates theory, providing lowest computational cost among known literature strategies, applied obtain coarse displacement solution; afterwards, solution used compute necessary in-plane derivatives recover stresses imposing equilibrium strong form. Since posteriori step relies on high-order continuity requirements, isogeometric analysis (IGA) represents natural simulation framework given its accuracy higher properties. Both Galerkin collocation formulations are herein considered. effectiveness approach proven extensive numerical tests.