PSI - Issue 20

Valeriy Lepov et al. / Procedia Structural Integrity 20 (2019) 57–62 Valeriy Lepov et al. / Structural Integrity Procedia 00 (2019) 000–000

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4. Conclusion Thus the considered approach of cold resistance assessment made possible to receive the necessary data for the choice of material with the optimum mechanical properties and microstructure. Such a material should be used to operate in responsible units and details of transport systems by the microstructural analysis of fracture mechanism nature at different temperatures and by the estimation of the impact toughness as the most important parameter for the steel cold resistance assessment. The fractography and modeling results of brittle and ductile fracture show the significant differences in mechanical behavior and crack grows velocity. So not only the mechanical properties of structural steel define the reliability of technical systems in extreme environment but also the sensitivity to ductile-brittle low temperature transition. The numerical modeling could help to estimate the crack velocity and energy dissipation processes in members of the modern equipment and machines operated in the Extreme environment. Acknowledgements This work has been supported by the Russian Foundation for Basic Research (Project 18-48-140015) in numerical calculations and by the Program for Basic Research of State Academies of Science (Project III.28.1.1.) in experimental study with the using of equipment of the Center for Collective Use of Federal Research Center “Yakut Scientific Center”. References Broberg, K.B., 1990, Computer demonstration of crack growth, Int. J. Fracture 42, 277-285. GOST 9454-78, 2003. Metals. A test method on a shock bend at low, room and higher temperatures, Moscow: Publishing house of standards, pp.10. (in Russian) Lepov, V., Grigoriev, A., Achikasova, V., Lepova, K., 2016, Some Aspects of Structural Modeling of Damage Accumulation and Fracture Processes in Metal Structures at Low Temperature, Modelling and Simulation in Engineering 2016, 7178028. Verigo, M. F., 1986. Interaction of a railway and rolling stock. Moscow: Transport, pp.559. (in Russian) Lepov, V., Grigoriev, A., Bisong, M.S., Lepova, K., 2018. Brittle Fracture Modeling for Steel Structures operated in the Extreme. Procedia Structural Integrity 5, 777-784.