Peridynamics for fatigue life and residual strength prediction of composite laminates

Abstract This study presents an application of peridynamics to predict damage initiation and growth in fiber reinforced composites under cyclic loading. The fatigue model utilizes standard S-N fatigue data for a lamina along with the critical energy release rate values. The fidelity of this model is established by simulating the tests conducted by the Air Force Research Laboratory under the Tech Scout Project. As part of this project, the AFRL tested open-hole composite laminates made of IM7/977-3 for three different layups under cyclic loads for strength and failure progression. The peridynamic predictions agree with the reduction in stiffness and strength as a function of number of load cycles. Also, the progressive damage predictions capture the general characteristics of the experimentally observed damage patterns.

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