CFRPに対する弾-粘塑性マクロ構成モデルおよび損傷則の汎用FEMソフトウェアへの導入

抄録

This paper proposes a method to implement an elastic-viscoplastic macroscopic constitutive model and a failure criterion for carbon fiber-reinforced plastic (CFRP) in finite element analysis software to analyze its elastic-viscoplastic deformation and failure behavior. To this end, an elastic-viscoplastic macroscopic constitutive model which is able to express strong anisotropy of unidirectional CFRP is introduced, and the material parameters in the model are determined based on the results of homogenization analysis using a unit cell. Moreover, the Christensen's criterion which is one of the failure criteria suitable for failure evaluation of composites such as CFRP is introduced. Then, the constitutive model and the Christensen's criterion are implemented in the finite element analysis software LS-DYNA through a user defined material subroutine. The present method is then applied to on- and off-axis tensile analysis of a unidirectional CFRP. The results qualitatively correspond with experimental results of tensile tests of unidirectional CFRP.