Effect of Lamina Material Properties on Dilatation and Through-Thickness Poisson’s Ratio of Angle-Ply Laminates

In this paper, a study of the through-thickness Poisson's ratio and the dilatation for the [±30°] 4s , [±45°] 4s , and [±60°] 4s angle-ply laminates is presented. Based on the classical lamination theory and the generalized Hook's law, a dimensionless analysis has been used to evaluate the values of the through-thickness Poisson's ratio and the dilatation in the angle-ply laminates. Also, the influences of the various lamina material properties such as Young's modulus, shear modulus, and Poisson's ratio on the through-thickness Poisson's ratio and the dilatation of the angle-ply laminates are obtained. The results from this dimensionless analysis provide a set of general guidelines for designing the values of the through-thickness Poisson's ratio and the dilatation of the angle-ply laminates to meet different environment conditions in engineering application.