LAUSR

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