복합재 구조물의 초기파손후의 거동묘사를 위한 모델과 해석방법

Abstract

Phenomenological failure models are implemented to a finite element method for post-failure analysis of composite laminated structure. In the finite element analysis, stresses and strains were analyzed on the basis of classical lamination theory with the consideration of material nonlinearity. Behavior of matrix cracked lamina was described by using of shear lag analysis and behavior of fiber directional failure was modeled with the conception of fiber bundle failure. Conventional shear lag analysis was extended to take into account in-plane shear deformation. In comparison with conventional post-failure analysis of composite structure, present method can address stress state of failed lamina and matrix crack density. Present analysis showed better agreement with experimental results than previous simple post-failure analysis for stress-strain relation of flat specimen.