Abstract
A three dimensional finite element code has been developed for the elastic-plastic analysis of fiber-reinforced composite materials and structures. The geometry, constitutive equations, and stiffness relations of the continuum element representing the composite are described. The finite element solution is obtained in the context of the displacement method of analysis. Solution of the nonlinear equilibrium equations is obtained with a Newton-Raphson type iteration technique. Results obtained using the finite element program for uniaxial loading of composite laminates show agreement with experiments. Other results for laminates describing development of plastic zones and overall stress-strain response are also shown for two problems: a plate with a hole and a notched plate.
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