TY - JOUR

T1 - A general phase-field model for fatigue failure in brittle and ductile solids

AU - Seleš, Karlo

AU - Aldakheel, Fadi

AU - Tonković, Zdenko

AU - Sorić, Jurica

AU - Wriggers, Peter

N1 - The authors are thankful to Dr. Predrag Čanžar for providing the experimental data used in this manuscript. The authors F. Aldakheel and P. Wriggers gratefully acknowledge support for this research by the “German Research Foundation” (DFG) in (1) the COLLABORATIVE RESEARCH CENTER CRC 1153 and (2) the PRIORITY PROGRAM SPP 2020 within their second funding phases. This work has also been supported by the Croatian Science Foundation under the project "Multiscale Numerical Modelling and Experimental Investigation of Aging Processes in Sintered Structural Components” (MultiSintAge, PZS-2019-02-4177). F. Aldakheel and K. Seleš would like to thank Dr. Marreddy Ambati for his helpful suggestions. Open Access funding enabled and organized by Projekt DEAL.

PY - 2021/5

Y1 - 2021/5

N2 - 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.

AB - 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.

KW - Brittle/ductile fracture

KW - Experimental validation

KW - Fatigue

KW - Paris law

KW - Phase-field modelling

KW - Wöhler curve

UR - http://www.scopus.com/inward/record.url?scp=85103403919&partnerID=8YFLogxK

U2 - 10.1007/s00466-021-01996-5

DO - 10.1007/s00466-021-01996-5

M3 - Article

AN - SCOPUS:85103403919

VL - 67

SP - 1431

EP - 1452

JO - Computational Mechanics

JF - Computational Mechanics

SN - 0178-7675

IS - 5

ER -