PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 23 (2019) 529–534

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Propagatio and behavior of fatigue cracks are governed by strain f elds in the vicinity of the crack tip. The n meric de crip ion of stra ns in the crack tip pres nts some ch lenges in th m dellin by the multisc le i volv d in the fracture analysis. In this study, it is proposed a 2D finite element analys s conducted for fatigue crack propagat on experiments (mode I) performed for a railway axle ste l EA4T under lane stress conditions. The analysis considers a geometric approach to define a multiscale mesh on a c ter-crack t nsion ( CT) specimen for which a nonlinear material mode with kinemat c harde ing was assumed. Crack tip opening displacement (CTOD) and plastic zones were deter ined for several load levels during loading and unl ading states. The r sults show that the applied correctio factors approximate bett r the crack propagat on rate. Furthermore, the quadratic dependence of CTOD with the stress intensity factor was in good agreement with the numerical solutions. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Finite element analysis of crack-tip opening displacement and plastic zones considering the cyclic material behaviour Hector A. Tinoco a,b,c *, Carlos I. Cardona a , Tom áš Vojtek b,c , Pavel Huta ř b,c a Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales. Edificio Fundadores C.P. 170001. Mani zales Caldas, Colombia b Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žiž kova 22, 616 62 Brno, Czech Republic c Central European Institute of Technology (CEITEC), Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic 9th International Conference on Materials Structure and Micromechanics of Fracture Finite element analysis of crack-tip opening displacement and plastic zones considering the cyclic material behaviour Hector A. Tinoco a,b,c *, Carlos I. Cardona a , Tom áš Vojtek b,c , Pavel Huta ř b,c a Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales. Edificio Fundadores C.P. 170001. Mani zales Caldas, Colombia b Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žiž kova 22, 616 62 Brno, Czech Republic c Central European Institute of Technology (CEITEC), Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic Abstract Abstract Propagation and behavior of fatigue cracks are governed by strain fields in the vicinity of the crack tip. The numerical description of strains in the crack tip presents some challenges in the modelling by the multiscale involved in the fracture analysis. In this study, it is proposed a 2D finite element analysis conducted for fatigue crack propagation experiments (mode I) performed for a railway axle steel EA4T under plane stress conditions. The analysis considers a geometric approach to define a multiscale mesh on a center-crack tension (CCT) specimen for which a nonlinear material model with kinematic hardening was assumed. Crack tip opening displacement (CTOD) and plastic zones were determined for several load levels during loading and unloading states. The results show that the applied correction factors approximate better the crack propagation rate. Furthermore, the quadratic dependence of CTOD with the stress intensity factor was in good agreement with the numerical solutions. Keywords: Crack-tip opening displacement, plastic zone, finite elment analysis, CTOD, stress intensity factor, crack growth Keywords: Crack-tip opening displacement, plastic zone, finite elment analysis, CTOD, stress intensity factor, crack growth

* Corresponding author. Tel.: +420 532 290 338. E-mail address: htinoco@autonoma.edu.co, tinoco@ipm.cz * Correspon ing au hor. Tel.: +420 532 290 338. E-mail address: htinoco@autonoma.edu.co, tinoco@ipm.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.140