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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Procedia Structural Integrity 23 (2019) 607–612

© 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. pl stic wake. Transient behaviour s observed when the crack starts to grow. The plastic w ke length has an i fluence on the crack lo ur results and a gre t impact on the comput tional cost. Previous works have analys d the influence of this p ra et r considering bi-d mensional specimens in either plane strain or plane stress conditi ns. La ely, some three-dimensional mo els have appear d in order to analyse th crack closure phenomenon. Th m in cope of this study is to qua tify nd c mprehend the minimum length requ red to stabilise the crack opening and closure v ues considering a three-dimensi al mod l. On this purpo e, a CT alu inium specimen h s be n mode l d three-dimensionally cons dering a straight cra k front and several calculations have been made in rder to evaluate the influence of the simulated plastic wake. The numerical analysis is made in terms of crack closure and opening values. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommons 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 Influence of plastic wake length on results of 3D numerical modelling of plasticity induced crack closure D. Camas a *, F. Antunes b , P. Lopez-Crespo a , A. Gonzalez-Herrera a a Department of Civil and Materials Engineering, University of Malaga, C/Dr. Ortiz Ramos s/n, 29071 Malaga, Spain b Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Portugal 9th International Conference on Materials Structure and Micromechanics of Fracture Influence of plastic wake length on results of 3D numerical modelling of plasticity induced crack closure D. Camas a *, F. Antunes b , P. Lopez-Crespo a , A. Gonzalez-Herrera a a Department of Civil and Materials Enginee ing, University of Malaga, C/Dr. Ortiz Ramos s/n, 29071 Malaga, Spain b Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Portugal Abstract Abstract The numerical analysis of the plasticity induced crack closure requires the development of the plastic wake. Transient behaviour is observed when the crack starts to grow. The plastic wake length has an influence on the crack closure results and a great impact on the computational cost. Previous works have analysed the influence of this parameter considering bi-dimensional specimens in either plane strain or plane stress conditions. Lately, some three-dimensional models have appeared in order to analyse the crack closure phenomenon. The main scope of this study is to quantify and comprehend the minimum length required to stabilise the crack opening and closure values considering a three-dimensional model. On this purpose, a CT aluminium specimen has been modelled three-dimensionally considering a straight crack front and several calculations have been made in order to evaluate the influence of the simulated plastic wake. The numerical analysis is made in terms of crack closure and opening values. The num rical a alysis of the pla ticity induced crack losur r quires the development f

Keywords: finite element analysis; plasticity induced crack closure; transient behaviour; plastic wake. Keywords: finite element analysis; plasticity induced crack closure; transient behaviour; plastic wake.

1. Introduction 1. Introduction

Crack closure phenomenon was introduced by Elber (Elber (1970), Elber (1971)) in the early 70s. The interaction between the fracture surface of the crack flanks implies a decrease of the stress intensity at the crack tip. Crack closure phenomenon was introdu ed by Elber (Elber (1970), Elber (1971)) in the early 70s. T interaction between the fracture surface of the crack flanks implies a decrease of the stress intensity at the crack tip.

* Corresponding author. Tel.: +34-951952303; fax: +34-951952601. E-mail address: dcp@uma.es * Correspon ing author. Tel.: +34-951952303; fax: +34-951952601. E-mail address: dcp@uma.es

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.2020.01.153