Failure of composite materials by the formation of kinkbands is a non-linear phenomenon involving interacting non-linear effects of material behavior of the matrix materials and fiber buckling. A constitutive model for unidirectional layered materials is implemented as User Material (UMAT) user subroutine in ABAQUS/Standard for analyzing the kinkband formation in the fiber composites under compressive loading within the framework of large deformation kinematics. This computational model analyses the effects of misalignment on elastic plastic deformation under plane strain conditions based on the smeared-out, plane constitutive numerical model. The model is successful in simulating the transition of the failure mode by buckling of long, slender beams to material instability by the kink band mechanism for short plate panels.
Proceedings of Nscm 23: 23rd Nordic Seminar on Computational Mechanics, 2010
Kinkband; microbuckling; Finite Element Analysis; Constitutive Model