PSI - Issue 28

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1176–1183

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Short cracks propagating under fatigue conditions are major concerns for the structural integrity of safety-critical applications. These defects tend to grow at high and irregular rates compared to long cracks under similar load, making the prediction of their evolution a challenging task. In this study, a computational approach comprising a crystal plasticity constitutive model and the Extended Finite Element Method (XFEM) is developed to investigate the slip-controlled short crack growth in a single crystal Ni based superalloy. The onset of fracture is controlled by the cumulative shear strain of individual slip systems and crack develops along crystallographic directions. The model is calibrated from low-cycle fatigue experiments and used to evaluate short crack growth paths and rates in [111] and [001] orientations at 24 °C and 650 °C. Furthermore, the slip behaviour around cracks is investigated. The obtained results show that this modelling approach can capture the tortuous short crack paths and predict the fluctuating propagation rates. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Short crack propagation; Crystal plasticity (CP); Extended finite element method (XFEM); Cumulative shear strain; Single crystal Abstract Short cracks propagating under fatigue conditions are major concerns for the structural integrity of safety-critical applications. T ese defects tend to grow at high and irregular rates compared to long cracks under similar load, making the prediction of their evolution a challenging task. In t is study, a computational appr ach comprising a crystal plasticity constitutive model and the Extended Finite Element Method (XFEM) is developed to investigate the slip-controlled short crack growth in a single crystal Ni bas d superalloy. The onset of fracture is controlled by the cumulative shear strain of individual slip systems and crack develops along crystallograp ic dir ctions. The model is calibrated fro low-cycl fatigue experiments and used to evaluate short crack gr wth paths and rates in [111] and [001] orient tions at 24 °C and 650 °C. F rthermore, the slip b haviour around cracks is investigated. The obtained results show that this modelling appro ch can capture the tortuous short crack paths and predict the fluctuating propagation rates. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Soci ty (ESIS) ExCo Keywords: Short crack propagation; Crystal plasticity (CP); Extended finite element method (XFEM); Cumulative shear strain; Single crystal 1st Virtual European Conference on Fracture An investigation of short crack propagation in a single crystal Ni based superalloy using crystal plasticity and the extended finite element method Ping Zhang a,b , Konstantinos P. Baxevanakis b , Liguo Zhao b* a School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China b Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK 1st Virtual European Conference on Fracture An investigation of short crack propagation in a single crystal Ni based superalloy using crystal plasticity and the extended finite element method Ping Zhang a,b , Konstantinos P. Baxevanakis b , Liguo Zhao b* a School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China b Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK

* Corresponding author. Tel.: +44 1509 227799. E-mail address: L.Zhao@Lboro.ac.uk * Corresponding author. Tel.: +44 1509 227799. E-mail address: L.Zhao@Lboro.ac.uk

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.099