The study of plastic strain and fracture localization under dynamic loading using infrared thermography technique

Authors

  • Михаил Альбертович Соковиков (Mikhail A. Sokovikov) Institute of Continuous Media Mechanics UB RAS

DOI:

https://doi.org/10.17072/1994-3598-2018-2-52-57

Keywords:

локализация пластической деформации, инфракрасная термография, динамическое нагружение

Abstract

Experimental study into the mechanisms of plastic strain localization under dynamic loading was carried out by the infrared thermograpy methods.  Dynamic tests of specimens were conducted using the split Hopkinson bar and target perforation techniques. The localized shear strains under high rate loading were explored in shear-compression specimens and specimens of special shape designed for such experiments. Localization of plastic strains under high-rate loading was investigated in target perforation tests involving the formation and ejection of a plug due to impact of a cylindrical striker made of high strength steel on the specimen. This phenomenon was studied in specimens made of aluminum alloys АМг6 and Д16. The investigation of the specimen surface was made online using the high-speed infrared camera CEDIP Silver 450M.  The distributions of the temperature field obtained at different instants of time made it possible to get insight into the evolution of the process of plastic strain localization.  The mechanisms of plastic strain localization under dynamic loading are supposed to be due to the two main factors: thermoplastic instability and jump-like processes occurring in the material structure. This statement was substantiated by the data of structural analysis of the loaded specimens and the results of numerical simulation, which was performed taking into account the kinetics of accumulation of micro-defects in the material under investigation.

References

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Published

2018-07-13

How to Cite

Соковиков (Mikhail A. Sokovikov) М. А. (2018). The study of plastic strain and fracture localization under dynamic loading using infrared thermography technique. Bulletin of Perm University. Physics, (2(40). https://doi.org/10.17072/1994-3598-2018-2-52-57

Issue

Section

Regular articles