Phase field cohesive zone modeling for fatigue crack propagation in quasi-brittle materials
CoRR(2024)
摘要
The phase field method has gathered significant attention in the past decade
due to its versatile applications in engineering contexts, including fatigue
crack propagation modeling. Particularly, the phase field cohesive zone method
(PF-CZM) has emerged as a promising approach for modeling fracture behavior in
quasi-brittle materials, such as concrete. The present contribution expands the
applicability of the PF-CZM to include the modeling of fatigue-induced crack
propagation. This study critically examines the validity of the extended PF-CZM
approach by evaluating its performance across various fatigue behaviours,
encompassing hysteretic behavior, S-N curves, fatigue creep curves, and the
Paris law. The experimental investigations and validation span a diverse
spectrum of loading scenarios, encompassing pre- and post-peak cyclic loading,
as well as low- and high-cyclic fatigue loading. The validation process
incorporates 2D and 3D boundary value problems, considering mode I and
mixed-modes fatigue crack propagation. The results obtained from this study
show a wide range of validity, underscoring the remarkable potential of the
proposed PF-CZM approach to accurately capture the propagation of fatigue
cracks in concrete-like materials. Furthermore, the paper outlines
recommendations to improve the predictive capabilities of the model concerning
key fatigue characteristics.
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