Hygrothermal Effects on the Buckling of Laminated Composite Plates with Random Geometric and Material Properties

The combined effects of temperature and moisture on the buckling of laminated composite plates with random geometric and material properties are investigated. A C0 finite element based on higher order shear deformation theory has been used for deriving the standard eigenvalue problem. The random material and geometric properties are modeled as basic random variables. A Taylor series based mean-centered first order perturbation technique is used to find mean and standard derivation of the hygrothermal buckling loads of laminated composite plates subjected to uniform temperature and moisture rise with different boundary conditions. The effects of modulus ratio, fiber orientation, length to thickness ratio, aspect ratio, and boundary conditions on the hygrothermal buckling are analyzed. It is found that a small amount of material and geometric variations of the composite plate significantly affect the hygrothermal buckling loads. The results have been validated with independent Monte Carlo simulations and those are available in literature.

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