PSI - Issue 66

ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Structural Integrity Procedia 00 (2025) 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 66 (2024) 471–477

8th International Conference on Crack Paths Influence of fretting fatigue parameters on fatigue life and crack orientation Andrea Zanichelli*, Andrea Carpinteri, Camilla Ronchei, Daniela Scorza, Sabrina Vantadori Department of Engineering & Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract Coupled metallic structural components, subjected to vibrations or small oscillatory movements, are prone to fretting, which can significantly affect their fatigue behaviour. Despite the numerous efforts in recent decades to investigate the influence of fretting parameters (such as fretting loading, friction coefficient, relative slip amplitude, contact geometry, surface finishing, different materials, testing environment) on the fatigue behaviour of the analysed components, research in this field is still open. In the present paper, experimental tests available in the literature, carried out on Al-4Cu specimens in partial slip regime with cylindrical fretting pads, are simulated through an analytical methodology proposed by the present authors. Satisfactory results in terms of both crack orientation and fatigue life are obtained by employing such a methodology. Then, a parametric study on the fretting parameters used as input data for this analytical methodology is performed in the present research work, in order to evaluate their influence on the fatigue life and crack orientation of fretting-affected structural components. © 2025 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 2024 Organizers Keywords: Al-4Cu alloy; analytical methodology; critical direction method; critical plane-based criterion; fretting fatigue. 1. Introduction Fretting phenomenon affects coupled metallic structural components that are subjected to vibrations or small oscillatory movements during their use in service. In particular, microcracks may nucleate near the contact surface in correspondence of the severe stress gradient which arises close to the edge of the contact zone (Waterhouse and 8th International Conference on Crack Paths Influence of fretting fatigue parameters on fatigue life and crack orientation Andrea Zanichelli*, Andrea Carpinteri, Camilla Ronchei, Daniela Scorza, Sabrina Vantadori Department of Engineering & Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract Coupled metallic structural components, subjected to vibrations or small oscillatory movements, are prone to fretting, which can significantly affect their fatigue behaviour. Despite the numerous efforts in recent decades to investigate the influence of fretting parameters (such as fretting loading, friction coefficient, relative slip amplitude, contact geometry, surface finishing, different materials, testing environment) on the fatigue behaviour of the analysed components, research in this field is still open. In the present paper, experimental tests available in the literature, carried out on Al-4Cu specimens in partial slip regime with cylindrical fretting pads, are simulated through an analytical methodology proposed by the present authors. Satisfactory results in terms of both crack orientation and fatigue life are obtained by employing such a methodology. Then, a parametric study on the fretting parameters used as input data for this analytical methodology is performed in the present research work, in order to evaluate their influence on the fatigue life and crack orientation of fretting-affected structural components. © 2025 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 2024 Organizers Keywords: Al-4Cu alloy; analytical methodology; critical direction method; critical plane-based criterion; fretting fatigue. 1. Introduction Fretting phenomenon affects coupled metallic structural components that are subjected to vibrations or small oscillatory movements during their use in service. In particular, microcracks may nucleate near the contact surface in correspondence of the severe stress gradient which arises close to the edge of the contact zone (Waterhouse and © 2025 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 2024 Organizers

* Corresponding author. Tel.: +39 0521 905923. E-mail address: andrea.zanichelli@unipr.it * Corresponding author. Tel.: +39 0521 905923. E-mail address: andrea.zanichelli@unipr.it

2452-3216 © 2025 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 2024 Organizers 2452-3216 © 2025 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 2024 Organizers

2452-3216 © 2025 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 2024 Organizers 10.1016/j.prostr.2024.11.099