Abstract
Laminated composite structures often meet compressive loads, leading to unstable delamination growth, accompanied by buckling and postbuckling issues. This chapter introduces the virtual crack closure technique (VCCT) to study the delamination growth behaviors of composite laminates with initial delamination defects under compression. The VVCT is used to predict the delamination growth and to calculate the energy release rate for judging the delamination growth, by combining the delamination failure criteria such as B-K law, power law, and Reeder law. Effects of different initial delamination sizes and their distributions on the load response as well as the delamination and postbuckling behaviors of symmetric and unsymmetric composite laminates are studied.
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