Abstract
Based on the classical laminate theory and proceeding from the necessary and sufficient conditions for the hygrothermal stability of materials, interlayer hybrid extension-twisting coupled free-layer laminates are designed. Then, analytical solutions for their yield and buckling strengths are derived. A mathematical model for the optimum design of composite structure is established to realize a synchronous multiobjective design of for interlayer hybrid extension-twisting coupled laminates. The finite-element method is used to simulate the hygrothermal effect, extension-twisting coupling, and buckling load of the laminates. Afterwards, an analysis of hygrothermal warping deformation and stiffness performance of the laminates is carried out to verify the suitability of the design method. Finally, the extension-twisting and bending-twisting coupled structures are constructed using the hybrid extension-twisting coupled laminates.
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