Optimization of Anisotropic Composite Panels with T-shaped Stiffeners including Transverse Shear Effects and Out-of-plane Loading
JE Herencia, PM Weaver & MI Friswell (University of Bristol)
Structural and Multidisciplinary Optimization, Vol. 37, No. 2, December 2008, pp. 165-184
A two step method to optimize anisotropic composite panels with T-shaped stiffeners, including a new formulation of the transverse shear properties and an approximation of the ply contiguity (blocking) constraints as functions of the lamination parameters is provided. At the first step, a representative element of the stiffened panel (superstiffener) is optimised using mathematical programming and lamination parameters subjected to combined loading (in and out-of-plane) under strength (laminate or ply failure), buckling and practical design constraints. Ply blocking constraints are imposed at this step to improve convergence towards practical laminates. At the second step, the actual superstiffener’s laminates are obtained by using a genetic algorithm. Results, for the case considered, show that the inclusion of transverse shear effects has a 2.5% mass penalty associated and that neglecting its effects might invoke earlier buckling failure. In addition, the influence of designing for strength failure at laminate or ply level is assessed.
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Link to paper using doi:10.1007/s00158-008-0227-6
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