PSI - Issue 77

ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 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 77 (2026) 207–214

© 2026 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 ICSI organizers Abstract Fatigue testing of polymer-matrix composites (PMCs) is traditionally conducted at low frequency range (below10 Hz), resulting in long testing durations and increased expenses. A viable strategy is to accelerate fatigue testing at higher frequencies within a feasible time duration. However, at higher frequencies, the self-heating effect becomes a critical factor, affecting the structural response and potentially altering the fatigue behaviour. The entropy-based thermodynamic framework effectively captures the impact of self-heating and improves fatigue response analysis by incorporating the correlation among heat dissipation rate, applied stress, and loading frequency. Unlike the conventional S-N curve methods, which may skip the self-heating effect, entropy-based models provide a rapid and more general assessment of fatigue behaviour under arbitrary applied stresses and frequencies. This study focuses on the application of entropy-based modelling to capture the complex interplay between stress, frequency, and temperature rise. This allows for predicting the life of a fatigue-loaded PMC specimen by accounting for the interplay between mechanical loading and thermal effects. The proposed framework provides a rapid methodology for characterizing the fatigue performance of PMCs, playing a key role in refining the structural integrity assessment of PMCs. © 2026 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 ICSI organizers Keywords: self-heating effect; fatigue life prediction; fracture fatigue entropy International Conference on Structural Integrity Fatigue life prediction of polymer-matrix composites using fracture fatigue entropy concept Jafar Amraei a, *, Andrzej Katunin a , Dominik Wachla a a Department of Fundamentals of Machinery Design, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland Abstract Fatigue testing of polymer-matrix composites (PMCs) is traditionally conducted at low frequency range (below10 Hz), resulting in long testing durations and increased expenses. A viable strategy is to accelerate fatigue testing at higher frequencies within a feasible time duration. However, at higher frequencies, the self-heating effect becomes a critical factor, affecting the structural response and potentially altering the fatigue behaviour. The entropy-based thermodynamic framework effectively captures the impact of self-heating and improves fatigue response analysis by incorporating the correlation among heat dissipation rate, applied stress, and loading frequency. Unlike the conventional S-N curve methods, which may skip the self-heating effect, entropy-based models provide a rapid and more general assessment of fatigue behaviour under arbitrary applied stresses and frequencies. This study focuses on the application of entropy-based modelling to capture the complex interplay between stress, frequency, and temperature rise. This allows for predicting the life of a fatigue-loaded PMC specimen by accounting for the interplay between mechanical loading and thermal effects. The proposed framework provides a rapid methodology for characterizing the fatigue performance of PMCs, playing a key role in refining the structural integrity assessment of PMCs. © 2026 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 ICSI organizers Keywords: self-heating effect; fatigue life prediction; fracture fatigue entropy International Conference on Structural Integrity Fatigue life prediction of polymer-matrix composites using fracture fatigue entropy concept Jafar Amraei a, *, Andrzej Katunin a , Dominik Wachla a a Department of Fundamentals of Machinery Design, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland

* Corresponding author. Tel.: +48-32-237-1069. E-mail address: amraei.jafar@gmail.com * Corresponding author. Tel.: +48-32-237-1069. E-mail address: amraei.jafar@gmail.com

2452-3216 © 2026 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 ICSI organizers 2452-3216 © 2026 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 ICSI organizers

2452-3216 © 2026 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 ICSI organizers 10.1016/j.prostr.2026.01.028