PSI - Issue 31

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

www.elsevier.com/locate/procedia

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ScienceDirect

Procedia Structural Integrity 31 (2021) 3–7

© 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 ICSID 2020 Organizers. © 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 ICSID 2020 Organizers. Abstract The aim of the paper is to investigate the influence of compressive residual stresses on the fatigue initiation life ( S-N ini ) curve of AISI 1141 steel. The analysis has been performed by means of a micro-structurally-based fatigue crack initiation modelling approach. The focus is set on the local (surface) residual stresses typically imposed by a surface treatment technique known as shot -peening. By superimposing such stresses on stresses resulting from outer cyclic loading, it could be shown that an impact on the fatigue curve in the S-N ini diagram can be achieved. © 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 ICSID 2020 Organizers. 4th International Conference on Structural Integrity and Durability, ICSID 2020 Influence of local residual stresses on fatigue crack initiation M. Mlikota a , S. Schmauder a , K. Dogahe a,b, *, Ž. Božić c a University of Stuttgart, Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), Pfaffenwaldring 32, Stuttgart, Germany b University of Stuttgart, Graduate School of Excellence advanced Manufacturing Engineering (GSaME), Nobelstraße 12, Stuttgart, Germany c University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture (FMENA), I. Lu č i ć a 5, 10000 Zagreb, Croatia Abstract The aim of the paper is to investigate the influence of compressive residual stresses on the fatigue initiation life ( S-N ini ) curve of AISI 1141 steel. The analysis has been performed by means of a micro-structurally-based fatigue crack initiation modelling approach. The focus is set on the local (surface) residual stresses typically imposed by a surface treatment technique known as shot -peening. By superimposing such stresses on stresses resulting from outer cyclic loading, it could be shown that an impact on the fatigue curve in the S-N ini diagram can be achieved. 4th International Conference on Structural Integrity and Durability, ICSID 2020 Influence of local residual stresses on fatigue crack initiation M. Mlikota a , S. Schmauder a , K. Dogahe a,b, *, Ž. Božić c a Universi y of Stuttgart, Institute f r Materials Testing, Materials Scie ce a d Strength of Materials (IMWF), Pfaffenwaldrin 32, Stuttg rt, Germany b Stuttgart, Graduate School of Excellence adv ced M nufacturing Engineering (GSaME), Nobelstraße 12 Stuttga t, Germany c University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture (FMENA), I. Lu č i ć a 5, 10000 Zagreb, Croatia 1. Introduction In cyclically loaded structures and components cracks may initiate at stress concentration sites (Božić et al. (2014), Mlikota et al. (2017), Mlikota et al. 2018), Mlikota and Schmauder (2018), Mlikota and Schmauder (2019), Pastorcic et al. (2019), Mlikota and Schmauder (2020)) and further propagate under service load (Božić et al. (2010), Božić et 1. Introduction In cyclically loaded structures and components cracks may initiate at stress concentration sites (Božić et al. (2014), Mlikota et al. (2017), Mlikota et al. 2018), Mlikota and Schmauder (2018), Mlikota and Schmauder (2019), Pastorcic et al. (2019), Mlikota and Schmauder (2020)) and further propagate under service load (Božić et al. (2010), Božić et Keywords: Fatigue crack initiation; physically-based modelling, microstructure, fatigue life, residual stresses Keywords: Fatigue crack initiation; physically-based modelling, microstructure, fatigue life, residual stresses

* Corresponding author. Tel.: +49 (0) 711-685-62734 ; fax: +49 (0) 711-685-62635. E-mail address: Kiarash.dogahe@imwf.uni-stuttgart.de (K. Dogahe)

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 ICSID 2020 Organizers. 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 ICSID 2020 Organizers. * Corresponding author. Tel.: +49 (0) 711-685-62734 ; fax: +49 (0) 711-685-62635. E-mail address: Kiarash.dogahe@imwf.uni-stuttgart.de (K. Dogahe)

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 ICSID 2020 Organizers. 10.1016/j.prostr.2021.03.002