This paper presents an analytical method to model the non-linear behavior of polymeric resin matrix composites. Complementary energy density is used to derive a stress-strain relation which is non-linear in uniaxial loadings in the longitudinal, transverse directions and in shear. The laminae behaviors are modeled by an n-order terms equation, with n going from two to five according to the non-linearity behavior. This paper presents results for [mat/0 well-balanced woven/mat] E-glass/polyester laminates with high matrix ratio and shows good agreement with experimental data.
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