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A peridynamic damage-cumulative hybrid model for fatigue cracking

A new peridynamic fatigue damage-cumulative hybrid model is developed in
this study, which is modeled by Kinetic Theory of Fracture(KTF) and
Paris formula. The compact tension specimen and modified compact tension
specimen are used to study the convergence of the fatigue crack growth
path and fatigue life. Then constant amplitude cyclic loading and
variable amplitude cyclic loading of the specimens are simulated. By
comparing with the experimental results, the accuracy of the model is
verified. Compared with the fatigue model that only uses KTF, the hybrid
model predicts the fatigue crack growth rate more accurately. The model
is based on the stress damage criterion in the fatigue crack initiation
stage, which can be a basis for fatigue prediction and safety design of
components in complex stress state in actual engineering.