A failure criterion to predict the onset of matrix cracking induced delamination in general composite laminates

Abstract

In this study, a new energy-based failure criterion is developed to predict the onset and growth of matrix cracking induced delamination, known as MCID in composite laminates. This criterion is formulated upon the concept of fracture mechanics by comparison of energy release rate obtained due to MCID and interface fracture toughness. This failure criterion is developed as a general model so that it can be appropriated for any arbitrary lay-up, under any in-plane or out of plane loading. The developed failure criterion is validated against several experimental studies in the unconstraint condition. It is revealed that the criterion is of excellent agreement with the experimental results. Furthermore, for the generalized plane strain condition, validation is performed using two different models. Lastly, some of the potential applications of the proposed failure criterion are presented in different laminates. Considering the unique characteristics of this criterion, it can be employed along with other failure criteria in the design of composite structures.