Analytical solution of buckling of beams with two delaminations

A stability problem of composite beams with multiple delamination was tackl ed. A closed-form solution was found and buckling loads of composite beams with two delaminations were determined in order to obtain their compressive load-carrying capacity. Crack-opening mode was assumed for each detached d elaminated region. Seven different regions having different transverse defo rmations resulted from assumed positions of delaminations. Developing the d erived continuity condition equations reduced the number of algebraic equat ions required to solve the problem analytically. The results of the work we re validated by comparing them to those reported in the literature. The eff ects of length, location, and distribution of multiple delaminations were c onsidered in the comparison, and the results showed very good agreement. Bu ckling load decreases as delamination size increases. Buckling load for a b eam with two delaminations is lower than that for the same beam with a sing le delamination.