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Modelling and Simulation in Engineering
Volume 2016 (2016), Article ID 7178028, 6 pages
http://dx.doi.org/10.1155/2016/7178028
Research Article

Some Aspects of Structural Modeling of Damage Accumulation and Fracture Processes in Metal Structures at Low Temperature

V. P. Larionov’s Institute of Physical-Technical Problems of the North, SB RAS, Yakutsk 677980, Russia

Received 4 December 2015; Accepted 1 June 2016

Academic Editor: Theodoros C. Rousakis

Copyright © 2016 Valeriy Lepov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The problem of brittle fracture of structures at low temperature conditions connected to damage accumulation and ductile-brittle transition in metals. The data for locomotive tire contact impact fatigue and spalling are presented. The results of experimental testing showed the impact toughness drop at low temperature. The internal friction method was applied to revealing of the mechanism of dislocation microstructure changes during the low temperature ductile-brittle transition. It has been shown for the first time that the transition is not connected to interatomic interactions but stipulated by thermofluctuation on nucleus such as microcracks and by their further growth and coalescence. From now on, the proposed mechanism would be used for theoretical and numerical modeling of damage accumulation and fracture in materials.