Abstract
This paper treats construction of the constitutive equation for inelastic behavior of CFRP, in which the damage effect is incorporated. At first, the authors propose an inelastic constitutive equation for CFRP subjected to cyclic loading. The constitutive equation is based on the constitutive model for cyclic plasticity proposed by the authors previously. Namely, the constitutive equation employs a damaged loading function that is similar to the loading function for metal alloys, the Ziegler type assumption to represent the movement of the damaged loading surface, and the Ramberg-Osgood stress-strain relation. To verify the applicability of the constitutive equation to the inelastic behavior of CFRP, a series of experiments, such as the cyclic tension-compression loading tests with several constant strain amplitudes, are carried out using laminated graphite/epoxy tubular specimens. The specimens have ±45 degree of fibers measured from the axial direction of the specimens. The predictions of the constitutive equation are compared with the experiments. As a result, it is found that the proposed constitutive equation can exactly predict the characteristic inelastic behavior of CFRP subjected to the cyclic loading, and that the damage variables are related to the strain amplitude of loading.
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