A new calibration approach of kinetic theory of fracture for fatigue life prediction in a peridynamic/finite element framework

This study explores the use of the kinetic theory of fracture (KTF) within a peridynamic (PD) model to simulate fatigue crack growth across various component geometries, presenting a novel approach distinct from traditional methods. Instead of relying on fatigue failure (S-N) curves, this research focuses on calibrating KTF parameters using fatigue crack growth measurements, specifically tracking crack length relative to the number of cycles (a-N curves). To validate this approach, experimental fatigue crack growth measurements were carried out on single edge bend (SEB) and compact tension (CT) specimens to assess the material’s fatigue behavior. The calibration of the KTF model is demonstrated through its ability to accurately simulate fatigue crack growth. Moreover, the study evaluates the model’s effectiveness with specimen geometries that differ from those used in the calibration process, enhancing its robustness and applicability. The findings affirm the viability of integrating KTF into peridynamic models for simulating fatigue crack growth and propose a refined method for parameter calibration utilizing a-N curves. The study concludes with a discussion on the implications of these results for practical applications and provides recommendations on the necessary testing data required for precise simulations across different component geometries.