Effect of the stress state on ultimate strain energy density in the failure of reinforced epoxy resin
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https://orcid.org/0000-0002-6508-6859
Sergey Smirnov
Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, Russia
Alexander Pestov
Postovskii Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, Russia
Viktoriya Osipova
Postovskii Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, Russia
Abstract
Epoxy resin reinforced with 10% of TiO2 and pure epoxy resin are taken to exemplify the possibility of constructing a fracture locus for engineering organic polymers as a dependence of ultimate strain energy density in cohesive failure on the stress triaxiality factor in the range and the Lode–Nadai coefficient . The fracture loci are based on the results of compressive testing of cylindrical specimens, tensile and compressive testing of bell-shaped specimens, dishing of thick-walled cup-shaped specimens, shearing of oblique dog-bone-shaped specimens. The tests were performed at 25 and −50 °C. The obtained dependences are approximated by interpolation formulas, and they can be used to predict the failure of structural components made of organic polymer materials mechanically affected under conditions of a complex stress state.
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