PSI - Issue 39

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

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Procedia Structural Integrity 39 (2022) 503–508

7th International Conference on Crack Paths A novel methodology for fatigue assessment of high strength steels with non-metallic inclusions Daniela Scorza a *, Andrea Carpinteri b , Camilla Ronchei c , Sabrina Vantadori b , Andrea Zanichelli b a Department of Engineering, University of Naples Parthenope, Centro Direzionale Isola C4 - 80143 Naples, Italy b Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy c Department of Civil Engineering, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende (CS), Italy 7th International Conference on Crack Paths A novel methodology for fatigue assessment of high strength steels with non-metallic inclusions Daniela Scorza a *, Andrea Carpinteri b , Camilla Ronchei c , Sabrina Vantadori b , Andr a Zanichelli b a Department of Engineering, University of Naples Parthenope, Centro Direzionale Isola C4 - 80143 Naples, Italy b Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy c Department of Civil Engineering, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende (CS), Italy

© 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 In the present paper, the multiaxial critical plane-based criterion proposed by Carpinteri et al. is employed in conjunction with the area -parameter model by Murakami and Yanase for the fatigue assessment of high strength steels, where the influence of non metallic inclusions on fatigue life is taken into account. An experimental campaign, available in the literature and performed on AISI 4140 steel specimens, is analysed to evaluate the criterion accuracy. The obtained results in terms of fatigue lifetime are compared with those experimentally obtained, showing a quite satisfactory agreement. © 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: non-metallic inclusions; high strength steel; fatigue strength; finite life; AISI 4140 steel 1. Introduction Non-metallic inclusions (NMIs) are chemical compounds of metals with non-metals, forming separated phases in the metallic matrix during both production and manufacturing/treatment processes (Kiessling R and Lange N, 1978)). Such NMIs are one of the leading causes of failure regarding gearboxes, railway wheels, crankshafts and so on, as is reported in the literature (Lambrighs et al., 2010). As a matter of fact, several experimental studies on high strength steels have shown the presence of white spots (or fish eyes), in the vicinity of non-metallic inclusions, which represent Abstract In the present paper, the multiaxial critical plane-based criterion proposed by Carpinteri et al. is employed in conjunction with the ar a -parameter mod l by Mur kam and Yanase for the fatigue assessment of high strength steels, where the influence of non metallic inclusions on fatigue life is take into account. An experimental campaign, available in the literature a d p rformed on AISI 4140 steel specimens, is analysed to evaluate the criterion accuracy. The obtained results in terms of fatigue lifeti e are compared with those experimentall obtained, showing a quite satisfactor agre ment. © 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 Keywords: non-metallic inclusions; high strength steel; fatigue strength; finite life; AISI 4140 steel 1. Introduction Non-metallic inclusions (NMIs) are chemical compounds of metals with non-metals, forming separated phases in the metallic matr x d r ng both production and manufact ring/treatment processes (Kie sling R and L ng N, 1978)). Such NMIs are one of the leading causes of failure regardi gearboxes, ailway whe l , crankshafts d so on, as is reported in th literature (Lambrighs et al., 2010). As matter of fact, several experimental studies on high strength steels have s own the presence of white spots (or fish eyes), in the vicinity of non-m tallic inclusion , which repr sent

* Corresponding author. Tel.: +39 0521 905923; fax: +396 0521 905924. E-mail address: daniela.scorza@uniparthenope.it * Corresponding author. Tel.: +39 0521 905923; fax: +396 0521 905924. E-mail address: daniela.scorza@uniparthenope.it

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 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 under responsibility of CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.123