PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceD rect Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

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

ScienceDirect

Procedia Structural Integrity 32 (2021) 321–325

© 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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Abstract The research of fiberglass aimed at studying the temperature and time effect on ultimate properties has shown that a 30-minute interdeformation pause at temperatures of 70 and 140 °C decreases fracture stress. The dilatometric studies of fiberglass have found that the structure of the composite matrix starts to rearrange at a temperature of 110 °C. When it is heated to 150 °C and then cooled, it does not recover its initial state, this being manifested in a change of the linear expansion of the composite at temperatures ranging from 20 to 150 °C. © 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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Keywords: polymer composite material; fracture stress; fiberglass; high temperature. 1. Introduction Polymer composite materials find an ever increasing application as structural elements in the current aircraft industry. One of the main advantages of polymer-matrix-based composites is their lower weight compared to conventional structural alloys at equal mechanical properties. At the same time, structural polymer-matrix-based high-duty composites must maintain their operability and survivability in extreme operating conditions under high external mechanical and thermal loads, including in emergency situations. As is shown in the works of Fu et al. (2020), Jiang et al.(2020), Mortazavian and Fatemi (2015), Tarfaoui et al. (2018), Zhang et al. (2019), the Abstract The research of fiberglass aimed at studying the temperature and time effect on ultimate properties has shown that a 30-minute int rd formati n pause at te per ures of 70 and 140 °C d creases fracture stress. Th dilatom tric tudies of fiberglass hav foun that the struct r of he composite matrix starts to rearrange at a temperature of 110 °C. When i is heated to 150 °C nd the cooled, it does not recover its in ial state, this being m if sted in a ch ng the linear expans on of the composite at emperatures ranging from 20 to 150 °C. © 2021 Th 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 u der responsibility of scientific committe of the XXIIth Winter School on Continuous Media Mechanics” K ywords: polymer com site material; fractur stress; fiberglass; high temperature. 1. Introduction Polymer composite materials find an ever increasing application as structural elements in the current aircraft industry. One of the ain advantages of polymer-matrix-based composites is their lower weight comp red to conventional struc ural lloys at equal mechanical properties. At the same time, structural polymer-matrix-based high-duty composi es must maintain their operability and survivability in extre e operating c nditions under high external mechanical and therm l loads, including i emergency situations. As is shown in the works of Fu t al. (2020), Jiang et al.(2020), M rtazavian and Fatemi (2015), Tarfaou et al. (2018), Zha g et al. (2019), the XXIIth Winter School on Continuous Media Mechanics Degradation of the Mechanical Properties of Fiberglass Under XXIIth Winter School on Continuous Media Mechanics Degradation of the Mechanical Properties of Fiberglass Under Discontinuous High-Temperature Loading A.S. Smirnov * , Yu.V. Khudorozhkova, A.V. Konovalov Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, 34 Komsomolskaya St., Ekaterinburg, 620049, Russian Federation Discontinuous High-Temperature Loading A.S. Smirnov * , Yu.V. Khudorozhkova, A.V. Konovalov Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, 34 Komsomolskaya St., Ekaterinburg, 620049, Russian Federation

* Corresponding author. Tel.: +7-343-362-3026. E-mail address: smirnov@imach.uran.ru * Corresponding author. Tel.: +7-343-362-3026. E-mail ad ress: smirnov@imach.uran.ru

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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 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 u der responsibility of t scientific committe of the XXIIth Winter School on Continuous Media Mechanics”

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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.046