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Predicting the onset of delamination in layered fiber‐reinforced composites

In this paper, composite structures are considered which consist of several layers of carbon fiber reinforced plastics (CFRP). For such layered composite structures, delamination constitutes one of the major failure modes and hence predicting its initiation is essential for their design. Evaluating stress‐strength relation based onset criteria requires an accurate representation of the through‐the‐thickness stress distribution, which can be particularly delicate in the case of shell‐like structures. Thus, in this paper, a solid‐shell finite element is utilized, which allows for incorporating a fully three‐dimensional material model, still being suited for application to thin structures. Moreover, locking phenomena are cured by using both the EAS and the ANS concept, and numerical efficiency is ensured through reduced integration. The proposed anisotropic material model accounts for the material's micro‐structure by using the concept of structural tensors. (© 2013 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)