A postprocessing scheme is developed to accurately determine transverse stresses in composite and sandwich panels undergoing geometrically nonlinear deformations. Transverse stresses are recovered at a point of interest via a one-dimensional, equilibrium-based least-square finite element method that utilizes the in-plane stresses and shear forces obtained by a finite element analysis. Numerical results demonstrate that, with minimal addition of computational efforts, the present postprocessing approach can be used to enhance the accuracy of transverse stresses.

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A micromechanical model is developed to characterize the constitutive behavior of stretch broken carbon fiber (SBCF) materials. The model takes into account the characteristics of the viscous resin materials and the effect of randomly distributed discontinuous fibers. The predicted force-to-stretch (FTS) values for uniaxial stretching of SBCF prepreg tapes favorably compare with experimental data.