Buckling analysis of bimaterial beams with single asymmetric delamination

Abstract

Delamination is one of the most common failure modes of composite laminates. A one-dimensional mathematical model is developed to analyze the buckling behavior of a two-layered beam with single asymmetric delamination for simple supported and clamped boundary conditions. The characteristic equation is developed by using Bernoulli–Euler beam theory. Nondimensionalized parameters, axial and bending stiffnesses are introduced and used as input parameters to the derived characteristic equation, rather than the young's moduli and thickness ratios of the individual layers. A new parameter effective-slenderness ratio is introduced which gives a measure of local, mixed and global buckling behavior. The analysis is validated with previously published data. A parametric study is carried out.