A NONLINEAR PREDICTING METHOD FOR FIBERREINFORCEDCOMPOSITE LAMINATES SUBJECTEDTO UNIAXIAL COMPRESSIVE LOAD

摘要

A simply and efficiently computational model for the fiber-reinforcedcomposite laminates, including stress analysis and failure detection, is developed to predictthe ultimate strengths of the composite laminates. In stress analysis, the proposed nonlinearconstitutive law for a single fiber-reinforced composite layer assumes that an elastic-plasticbehavior exists in normal stress of fiber and matrix and the nonlinear behavior exists in inplaneshear stress. The onset of failure for individual lamina within the laminate is detectedby a mixed failure criterion. In addition, the post-damage modes of composites are also takeninto account. The individual layer constitutive equations are superimposed by using theclassical lamination theory to yield the global laminate response. The accuracy of theproposed model is illustrated by comparing the results of numerical simulations withexperimental data available in the literature and the results predicted by other failure models.