On Bending-Twisting coupled laminates

摘要

The definitive list of stacking sequences is presented for Bending-Twisting coupled (A(S)B(0)D(F)) laminates, with up to 21 plies. This class of laminate arises from the ubiquitous balanced and symmetric design rule, but symmetry is shown to be a sufficient rather than a necessary constraint. Each stacking sequence configuration is derived in symbolic form together with dimensionless parameters from which the extensional and bending stiffness terms are readily calculated for any fibre/matrix system and angle-ply orientation. Expressions for ply orientation dependent lamination parameters are also given, together with graphical representations, which demonstrate the extent of the design space. Pseudo QuasiHomogeneous (A(S)B(0)D(F)) laminates are introduced as an important laminate sub-set, since such laminates have concomitant orthotropic properties, i. e. matching orthotropic or isotropic stiffnesses in extension and bending, from which the isolated effects of Bending-Twisting coupling can be studied. These coupling effects are quantified for compression buckling of Angle-ply and Quasi-Isotropic laminated plates with simply supported and clamped edges. (C) 2016 Elsevier Ltd. All rights reserved.