PSI - Issue 18

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

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ScienceDirect

Procedia Structural Integrity 18 (2019) 20–27

25th International Conference on Fracture and Structural Integrity Minimizing self-heating based fatigue degradation in polymeric composites by air cooling Andrzej Katunin a *, Dominik Wachla a a Silesian University of Technology, Institute of Fundamentals of Machinery Design, Konarskiego 18A, 44-100 Gliwice, Poland Abstract The self-heating effect occurs during cyclic loading or vibrations of composite elements, which may significantly intensify structural degradation due to the rapid temperature increase, especially in the case of development of the non-stationary self heating scenario. The self-heating temperature may pass its critical value during loading and dominate fatigue fracture of a structure. For minimizing the influence of self-heating during fatigue of polymeric composites the air cooling can be used in order to cool down the surface. In this study, the influence of air cooling on the fatigue and residual life of a cyclically loaded composite structure is investigated by theoretical analysis and preliminary experimental studies. The phenomenological model of self-heating of a composite structure during air cooling is presented and discussed with identification of possible scenarios of self-heating temperature evolution and including the forced cooling by the high-speed airflow. The preliminary experimental results show that the surface cooling has significant influence on the residual life of a structure, and, by heat removing, the durability of a structure being under the influence of the self-heating effect can be significantly extended. These observations allow for posing a conjecture that appropriately controlled air cooling of a surface of a loaded structure may prevent or at least minimize structural degradation during fatigue caused by the self-heating effect. 25th International Conference on Fracture and Structural Integrity Minimizing self-heating based fatigue degradation in polymeric composites by air cooling Andrzej Katunin a *, Dominik Wachla a a Silesian University of Technology, Institute of Fundamentals of Machinery Design, Konarskiego 18A, 44-100 Gliwice, Poland Abstract The self-heating effect occurs during cyclic loading or vibrations of composite lements, which may significantly intensify structural degradation due to the rapid t mperature increase, especially in the case f development of the non-stationary self heating scenario. The self- ating temperature m y pass its critical value during loading and dominate fati ue fracture of a structure. For minimizing the influence of self-heating during fatigue of polymeric composit s the air cooling can be used in order to cool down the surface. In this study, the influence of air cooling on the fatigue and residual life of a cycli lly loaded composite structure is investigated by theoretical analysis and preliminary experimental stu ies. The phenomenological model f s lf- ti of a composite structure uring air cooling is presented and discussed with identification of possible scenarios of s lf-heating temperature evolution and including the forced ooling by the high-speed airflow. The prelimin ry experimental results show that the surface cooling as significant influence on the residual life of a structure, and, by heat removing, the durability of a stru ture being under the influen e of the self-heati effect can be significantly extended. These observations allow for posing conjecture that appropriat ly controlled air cooling of a surface of a loaded structure may prevent or at least minimize structural degradation during fatigue caused by the self-heating effect.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: self-heating effect; fatigue of polymeric composites; air cooling; structural degdadation. Keywords: self-heating effect; fatigue of polymeric composites; air cooling; structural degdadation.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Correspon ing author. Tel.: +48 32 237 1069; fax: +48 32 237 1360. E-mail address: andrzej.katunin@polsl.pl * Corresponding author. Tel.: +48 32 237 1069; fax: +48 32 237 1360. E-mail address: andrzej.katunin@polsl.pl

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.136