Abstract
Material-independent necessary and sufficient conditions are derived for extension-shear coupled laminate with immunity to hygro-thermal shearing distortion (HTSD) using classical lamination theory. It is proven that no standard form of extension-shear coupled laminate with immunity to HTSD exists. A survey is performed to identify free form of extension-shear coupled laminate with immunity to HTSD that produce maximum extension-shear coupling. This is achieved through a constrained optimization routine, where the constraints are the material-independent necessary and sufficient conditions for laminates with immunity to HTSD. Results are presented for the symmetric laminates that consist of 8–14 plies. Comparisons are made on hygrothermal behavior and buckling strength of extension-shear coupled laminates with and with immunity to HTSD. The robustness of the extension-shear coupled laminates with immunity to HTSD is verified by using Monte Carlo simulation for laminates with fiber orientation that slightly deviates from the theoretically designed direction.
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