Issue 75

D. I. Vichuzhanin et alii, Fracture and Structural Integrity, 75 (2026) 220-237; DOI: 10.3221/IGF-ESIS.75.16

Effect of the stress state on ultimate strain energy density in the failure of reinforced epoxy resin

D. I. Vichuzhanin, S. V. Smirnov Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, Russia mmm@imach.uran.ru, http://orcid.org/0000-0002-6508-6859 smirnov.sergy@hk.ru, http://orcid.org/0000-0002-2083-5377 A. V. Pestov, V. A. Osipova Postovskii Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, Russia

pestov@ios.uran.ru, http://orcid.org/0000-0002-4270-3041 osipova.sva@gmail.com, http://orcid.org/0000-0001-7451-9428

Citation: Vichuzhanin, D.I., Smirnov, S.V., Pestov, A.V., Osipova, V.A., Effect of the Stress State on Ultimate Strain Energy Density in the Failure of Reinforced Epoxy Resin, Fracture and Structural Integrity, 75 (2026) 220-237.

Received: 30.07.2025 Accepted: 16.10.2025 Published: 01.11.2025 Issue: 01.2026

Copyright: © 2026 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

K EYWORDS . Epoxy Resin, Stress triaxiality factor, Lode–Nadai coefficient, Strain energy density.

I NTRODUCTION

poxy materials are used in construction, mechanical engineering, and household appliances as protective coatings, sealers, glues, impregnating and repair materials. In the processes, the structural components may experience a complex stress-strain state under conditions of both low and high temperatures. In view of the trend for an ever increasing use of these materials in state-of-the-art structures and mechanisms, it is relevant to predict their failure under service loads. The stress state in compressive, tensile, bending, and other tests regulated by standards is generally different E

220