Abstract
A study of the growth of delamination due to bending in a [90 5/0 5/90 5] graphite/epoxy laminate is presented. A plane strain finite element analysis is used to determine the strain energy release rate during delamination in a three-point-bend specimen. A closed form expression for energy release rate is obtained from classical lamination theory and Timoshenko beam theory and is compared with the finite element analysis result. These results combined with the experimentally determined critical load, P crit, are used to calculate the critical strain energy release rate, G C. The critical energy release rate is also determined experimentally by the compliance method.
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