Abstract
In this study, the development of an elastic-viscoplastic macroscopic constitutive model for composites and its implementation in the finite element analysis code LS-DYNA are conducted for structural analyses of composites. To this end, an elastic-viscoplastic macroscopic constitutive model which is able to express strong anisotropy of composites is introduced, and the material parameters in the model are determined based on the results of homogenization analysis using a unit cell. Then, the constitutive model is implemented in the LS-DYNA through a user defined material subroutine. The present method is then applied to a bending analysis of a cantilever beam made of a unidirectional carbon fiber-reinforced plastic (CFRP). For comparison, the same bending analysis is performed using the two-scale analysis method based on the homogenization theory developed by our research group. It is found that the both analysis results are in good agreement, showing validity of the present method. It is also shown that the present method is successful in greatly reducing the computational costs compared with the two-scale analysis method.
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