PSI - Issue 51

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ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 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 51 (2023) 95–101

6th International Conference on Structural Integrity and Durability (ICSID 2022) Fatigue life assessment of imperfective cast steel components in the medium-cycle regime by stress- and energy-based concepts 6th International Conference on Structural Integrity and Durability (ICSID 2022) Fatigue life assessment of imperfective cast steel components in the medium-cycle regime by stress- and energy-based concepts

Michael Horvath a, *, Matthias Oberreiter a , Michael Stoschka a a Christian Doppler Laboratory for Manufacturing Process based Component Design, Chair of Mechanical Engineering, Montanuniversitaet Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria Michael Horvath a, *, Matthias Oberreiter a , Michael Stoschka a a Christian Doppler Laboratory for Manufacturing Process based Component Design, Chair of Mechanical Engineering, Montanuniversitaet Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria

© 2023 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 scientific committee of the ICSID 2022 Organizers Abstract Manufacturing process-based imperfections, such as shrinkage porosities, severely limit the fatigue strength of cast steel components. Due to the complexly shaped spatial geometry of such defect structures, the application of local fatigue assessment concepts is recommendable. This work applies the Theory of Critical Distances (TCD) to assess the fatigue life of imperfective cast steel components made of G12MnMo7-4+QT in the medium-cycle regime. Based on a calibration procedure utilizing generalized S-N curves of plain and notched specimens at various load ratios, the relationship between the critical distance L M and the number of cycles to failure N f is parametrized first. At second, the implemented planar framework is validated with specimens featuring a different notch geometry. The presented linear-elastic methodology is furthermore extended to arbitrarily shaped spatial imperfections, resulting in reasonable predictions of experimentally derived fatigue life results. Moreover, a strain energy density based fatigue assessment methodology is formulated, introducing a relationship between the control radius R c and N f . The yielded fatigue strength assessment values correspond to the results of the initially implemented TCD-framework. Concluding, the presented stress- and energy-based concepts depict engineering-feasible methodologies to assess the fatigue life of cast steel components affected by complexly shaped shrinkage imperfections. © 2023 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 scientific committee of the ICSID 2022 Organizers Keywords: Cast steel; defects; fatigue design; local assessment methods Abstract Manufacturing process-based imperfections, such as shrinkage porosities, severely limit the fatigue strength of cast steel components. Due to the complexly shaped spatial geometry of such defect structures, the application of local fatigue assessment concepts is recommendable. This work applies the Theory of Critical Distances (TCD) to assess the fatigue life of imperfective cast steel components made of G12MnMo7-4+QT in the medium-cycle regime. Based on a calibration procedure utilizing generalized S-N curves of plain and notched specimens at various load ratios, the relationship between the critical distance L M and the number of cycles to failure N f is parametrized first. At second, the implemented planar framework is validated with specimens featuring a different notch geometry. The presented linear-elastic methodology is furthermore extended to arbitrarily shaped spatial imperfections, resulting in reasonable predictions of experimentally derived fatigue life results. Moreover, a strain energy density based fatigue assessment methodology is formulated, introducing a relationship between the control radius R c and N f . The yielded fatigue strength assessment values correspond to the results of the initially implemented TCD-framework. Concluding, the presented stress- and energy-based concepts depict engineering-feasible methodologies to assess the fatigue life of cast steel components affected by complexly shaped shrinkage imperfections. © 2023 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 scientific committee of the ICSID 2022 Organizers Keywords: Cast steel; defects; fatigue design; local assessment methods

* Corresponding author. Tel.: +43-3842-402-1480. E-mail address: michael.horvath@unileoben.ac.at * Corresponding author. Tel.: +43-3842-402-1480. E-mail address: michael.horvath@unileoben.ac.at

2452-3216 © 2023 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 scientific committee of the ICSID 2022 Organizers 2452-3216 © 2023 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 scientific committee of the ICSID 2022 Organizers

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