PSI - Issue 39

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDir ct Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

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

ScienceDirect

Procedia Structural Integrity 39 (2022) 387–392

7th International Conference on Crack Paths Tuning lamellar structure distribution around elliptical notch in Ti-6Al-4V for fatigue performance 7th International Conference on Crack Paths Tuning lamellar structure distribution around elliptical notch in Ti-6Al-4V for fatigue performance

Keke Tang a, *, Kunrong Chen a , Paolo Ferro b , Filippo Berto c a School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China b University of Padova, Department of Engineering and Management, Stradella S. Nicola, Vicenza, Italy c NTNU, Department of Engineering Design and Materials, Trondheim, Norway Keke Tang a, *, Kunrong Chen a , Paolo Ferro b , Filippo Berto c a School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China b University of Padova, Department of Engineering and Management, Stradella S. Nicola, Vicenza, Italy c NTNU, Department of Engineering Design and Materials, Trondheim, N rway

© 2021 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 CP 2021 – Guest Editors Abstract The paper is aimed to investigate the effect of lamellar structure distribution around elliptical notch in bimodal titanium alloys of Ti-6Al-4V. In this regard, within the framework of crystal plasticity based finite element (CPFE), Representative volume element (RVE) model with elliptical notch for bimodal Ti–6Al–4V is developed, to address the effect of lamellar structure on fatigue resistance performance under external fatigue loading. Lamellar structure distribution around elliptical notches with different aspect ratios are investigated. Strain along radial and circular paths are extracted to identify the possible crack initiation points. The numerical results show that, Strain distribution around notches can be adjusted through lamellar structure distribution such that strain uniformity is achieved. Increase of strain oscillation caused by lamellar structure leads to the improvement of fatigue resistance. With the increase of notch aspect ratio, elliptical notch eventually evolves into line crack and tuning performance of lamellar structure appreciably declines. This numerical study provides a new insight into lamellar structure tuning in dual-phase titanium alloys. © 2021 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 CP 2021 – Guest Editors Keywords: Lamellar structure; Ti-6Al-4V; strain accumulation; elliptical notch; fatigue resistance Abstract The paper is aimed to investigate the effect of lamellar structure distribution around elliptical notch in bimodal titanium alloys of i-6Al-4V. In this regard, w thin t framework of crystal plasticity based finite element (CPFE), Representative vol e e ement (RVE) model w th lliptical notc fo bimodal Ti–6Al–4V i develop , to address the effect of lamellar structure on fatigue resistance p rformance under ex ernal fatigue loading. Lamellar structure is ribution around elliptical notches with differe t spect at os ar investig ted. Strain alo g rad al and c rcular paths are ext acted to ide tify the poss ble cra k init ation poi s. The numerical resul s show that, Strai distr bution around notc es can be adjus ed through lamellar structure distribution such that strain uniformity is achieved. Increa e of strain scillation caused by lamellar str cture leads to the improvement of fatigue resistance. With the incr as of otch aspect r tio, elliptical notch eventu lly evolves into ine crack and tuning p rformance of lamellar structure appreci bly declines. This numerical study provides a new insight into lam lla structure tu ing in dual-phase titanium alloys. © 2021 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 u der re ponsibility of CP 2021 – Guest Editors K ywords: Lamellar structure; Ti-6Al-4V; strain accumulation; elliptical notch; fatigue resistance

* Corresponding author. Tel.: +86-21-65982267; fax: +86-21-65982267. E-mail address: kktang@tongji.edu.cn * Corresponding author. Tel.: +86-21-65982267; fax: +86-21-65982267. E-mail address: kktang@tongji.edu.cn

2452-3216 © 2021 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 CP 2021 – Guest Editors 2452-3216 © 2021 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 u der responsibility of CP 2021 – Guest Editors

2452-3216 © 2021 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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.107