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

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

Procedia Structural Integrity 39 (2022) 460–465

© 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 As is well-known, the loading non-proportionality has a significant influence on fatigue process, since the rotation of principal stress/strain axes can lead to additional cyclic hardening. In order to accurately reflect the effect of additional cyclic hardening on the predicted lifetime, Vantadori has recently formulated a strain-based fatigue criterion which implements a novel strain factor (function of material constants and degree of non-proportionality) in the damage parameter relationship. By considering some experimental data available in the literature, the goal of the present paper is to discuss the accuracy of the present criterion in estimating fatigue lifetime of metallic components, especially under non-proportional loading. © 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: additional cyclic hardening; fatigue lifetime; non-proportional loading 1. Introduction Several metallic components and structures, like pressure vessels and high temperature exchangers, undergo multiaxial Low Cycle Fatigue (LCF) under non-proportional loading. The loading non-proportionality can be produced, for instance, by phase-shifted loads, cyclic loads with non-zero mean values, or asynchronous loads. As is Abstract As is well-known, the loading non-proportionality has a significant influence on fatigue process, since the rotation of principal stres /strain axes can lead to additional cycl c h rdening. In order to accurately reflect th effe t of additional cyclic hardeni g on the predicted lifetime, Vantador has re ently formulated a st ain-based f tigue criterion whi h implements a novel strai fact r (function of material constants and degr e of non-proportional ty) in the damage parameter relationship. By c nside ing some experimental d ta vailable in the lit rature, the goal of he present paper is to discuss the accuracy of the present c terion in stimating fatigue lifet me of metallic components, especially und r non-proportional loading. © 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: additional cyclic hardening; fatigue lifetime; non-proportional loading 1. Introduction Several metallic components and structures, like pressure vessels and high temperature exchangers, undergo multiaxi Low Cycle Fatigue (LCF) unde non-pro ortional loading. T e loading non-proportionality can be produced, for instan e, by phase-shifted loads, cyclic loads with n n-zero mean values, or asynchr nous loads. As is 7th International Conference on Crack Paths A Novel Damage Parameter for Fatigue Life Assessment under Non-Proportional Loading Camilla Ronchei a* , Andrea Carpinteri b , Daniela Scorza c , Andrea Zanichelli b , Sabrina Vantadori b a Department of Civil Engineering, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende (CS), Italy b Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy c Department of Engineering, University of Naples Parthenope, Centro Direzionale Isola C4, 80143 Napoli, Italy 7th International Conference on Crack Paths A Novel Damage Parameter for Fatigue Life Assessment under Non-Proportional Loading Camilla Ronchei a* , Andrea Carpinteri b , Daniela Scorza c , Andrea Zanichelli b , Sabrina Vantadori b a Department of Civil Engineering, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende (CS), Italy b Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy c Department of Engineering, University of Naples Parthenope, Centro Direzionale Isola C4, 80143 Napoli, Italy

* Corresponding author. Tel.: 0039-0984-496866 E-mail address: camilla.ronchei@unical.it * Corresponding author. Tel.: 0039-0984-496866 E-mail address: camilla.ronchei@unical.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.2022.03.115