Phase-field modeling of fatigue coupled to cyclic plasticity in an energetic formulation
| Autor: | Ulloa, Jacinto, Wambacq, Jef, Alessi, Roberto, Degrande, Geert, François, Stijn |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Comput. Methods Appl. Mech. Engrg., Vol. 373, (2021), pp. 113473 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.cma.2020.113473 |
| Popis: | This paper presents a modeling framework to describe the driving mechanisms of cyclic failure in brittle and ductile materials, including cyclic plasticity and fatigue crack growth. A variational model is devised using the energetic formulation for rate-independent systems, coupling a phase-field description of fatigue fracture to a cyclic plasticity model that includes multi-surface kinematic hardening, gradient-enhanced isotropic hardening/softening and ratcheting. The coupled model embeds two distinctive fatigue effects. The first captures the characteristic features of low-cycle fatigue, driven by the accumulation of plastic strains, while the second accounts for high-cycle fatigue, driven by free energy accumulation. The interplay between these mechanisms allows to describe a wide range of cyclic responses under both force loading and displacement loading, as shown in several numerical simulations. Moreover, the phase-field approach to fracture accounts for the initiation and propagation of fatigue-induced cracks. Comment: Minor errata corrections (pages 17 and 18). 48 pages, 22 figures |
| Databáze: | arXiv |
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