A general phase-field model for fatigue failure in brittle and ductile solids
| Autor: | Zdenko Tonković, Jurica Sorić, Peter Wriggers, Karlo Seleš, Fadi Aldakheel |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Experimental validation Paris law Wöhler curve Energy accumulation Computational Mechanics Ocean Engineering Monotonic function 010103 numerical & computational mathematics 02 engineering and technology 01 natural sciences Phase-field approaches Dewey Decimal Classification::000 | Allgemeines Wissenschaft::000 | Informatik Wissen Systeme::004 | Informatik Brittleness 0203 mechanical engineering ddc:530 Nonlinear kinematic hardening 0101 mathematics Fatigue Parametric statistics Mathematics Energy degradation Phenomenological approach Applied Mathematics Mechanical Engineering Energy dissipation Isotropy Fracture mechanics Mechanics Phase-field modelling Computational Mathematics Nonlinear system 020303 mechanical engineering & transports Fracture Computational Theory and Mathematics Structural loading Fracture (geology) Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik Brittle/ductile fracture ddc:004 Elasto-plastic material models Fatigue of materials Physical interpretation |
| Zdroj: | Computational Mechanics 67 (2021), Nr. 5 Computational Mechanics |
| Popis: | In this work, the phase-field approach to fracture is extended to model fatigue failure in high- and low-cycle regime. The fracture energy degradation due to the repeated externally applied loads is introduced as a function of a local energy accumulation variable, which takes the structural loading history into account. To this end, a novel definition of the energy accumulation variable is proposed, allowing the fracture analysis at monotonic loading without the interference of the fatigue extension, thus making the framework generalised. Moreover, this definition includes the mean load influence of implicitly. The elastoplastic material model with the combined nonlinear isotropic and nonlinear kinematic hardening is introduced to account for cyclic plasticity. The ability of the proposed phenomenological approach to naturally recover main features of fatigue, including Paris law and Wöhler curve under different load ratios is presented through numerical examples and compared with experimental data from the author’s previous work. Physical interpretation of additional fatigue material parameter is explored through the parametric study. |
| Databáze: | OpenAIRE |
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