Delamination is one of the main defects in composite materials. Studying the initiation and propagation of delamination is useful for the design and production of high quality resistant materials. Therefore understanding the behavior of delamination damage and having enough knowledge about that will be helpful. In this study, generated acoustic emission signals from two types of glass/epoxy composite specimens at different layups, [0,90]5s and [0]10, is recorded. After that signals were analyzed by applying strain energy function. The results indicate that specimens at different layups have different stiffness behavior toward damage initiation and growth. Using strain energy function method initiation and growth of delamination can be evaluated. The obtained results provide useful information for the design and production of high quality resistant composite materials.

Keywords: Acoustic emission, Delamination, Strain Energy Function, Damage Initiation

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