Inheriting previous studies on the optimal cool-down path of the composite laminate, this article incorporates the consideration of a new element-humidity-to analyze the residual stresses which develop in a composite material laminate after termination of cool down due to further exposure to humid environment.Computations are performed for AS4/3502 symmetric balanced cross ply laminate. Hygrothermorheologically simple material viscoelastic behavior and the constant expansion coefficients of temperature and moisture are considered and an optimal temperature path is obtained with the aid of variations to yield the minimal value for the average residual stress within the laminate.
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