PSI - Issue 68

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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 68 (2025) 1301–1304

European Conference on Fracture 2024 The self-heating effect on hybrid composites P.N.B. Reis a *, A. Katunin b , D. Wachla b a University of Coimbra, CEMMPRE, ARISE, Depart. of Mechanical Engineering, 3030-788 Coimbra, Portugal b Department of Fundamentals of Machinery Design, Silesian University of Technology, Gliwice 44-100, Poland European Conference on Fracture 2024 The self-heating effect on hybrid composites P.N.B. Reis a *, A. Katunin b , D. Wachla b a University of Coimbra, CEMMPRE, ARISE, Depart. of Mechanical Engineering, 3030-788 Coimbra, Portugal b Department of Fundamentals of Machinery Design, Silesian University of Technology, Gliwice 44-100, Poland

Abstract Recently, hybrid composites attract attention due their sustainability and specific properties. However, the advantages of biodegradability of these materials imply numerous challenges in terms of repeatability of mechanical properties and structural behavior. Due to this, it is essential to investigate their structural response under specific environmental and loading conditions. One of the crucial properties of composite materials is the resistance to fatigue, which should ensure proper and safe operation of structures and components made of these materials. Under certain loading conditions, e.g., when composites are subjected to cyclic loads, the self-heating effect may occur in a non-stationary regime, accelerating the structural degradation and leading to the failure. However, the fatigue and degradation processes can be described by specific fatigue parameters. In this study, the concept of evaluation of fatigue resistance based on critical self-heating temperature was adapted to evaluate the response of hybrid composites. The determined values of the critical self-heating temperature can be used as an indicator of the development of fatigue failure and can be used as a material property specific for a given material. The adapted approach based on the critical self-heating temperature was validated with the results acquired from the acoustic emission tests, demonstrating high consistency and accuracy in determination of this fatigue property. © 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 ECF24 organizers Keywords: polymeric composites; hybrid composites; self-heating; fatigue limit; material testing 1. Introduction Polymer matrix composites (PMCs) are currently taking the place of conventional metallic materials in many industrial sectors. In many of them, they are used in critical components/structures where their integrity and reliability Abstract Recently, hybrid composites attract attention due their sustainability and specific properties. However, the advantages of biodegradability of these materials imply numerous challenges in terms of repeatability of mechanical properties and structural behavior. Due to this, it is essential to investigate their structural response under specific environmental and loading conditions. One of the crucial properties of composite materials is the resistance to fatigue, which should ensure proper and safe operation of structures and components made of these materials. Under certain loading conditions, e.g., when composites are subjected to cyclic loads, the self-heating effect may occur in a non-stationary regime, accelerating the structural degradation and leading to the failure. However, the fatigue and degradation processes can be described by specific fatigue parameters. In this study, the concept of evaluation of fatigue resistance based on critical self-heating temperature was adapted to evaluate the response of hybrid composites. The determined values of the critical self-heating temperature can be used as an indicator of the development of fatigue failure and can be used as a material property specific for a given material. The adapted approach based on the critical self-heating temperature was validated with the results acquired from the acoustic emission tests, demonstrating high consistency and accuracy in determination of this fatigue property. © 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 ECF24 organizers Keywords: polymeric composites; hybrid composites; self-heating; fatigue limit; material testing 1. Introduction Polymer matrix composites (PMCs) are currently taking the place of conventional metallic materials in many industrial sectors. In many of them, they are used in critical components/structures where their integrity and reliability © 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 ECF24 organizers

* Corresponding author. E-mail address: paulo.reis@dem.uc.pt * Corresponding author. E-mail address: paulo.reis@dem.uc.pt

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 ECF24 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 ECF24 organizers

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