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Open AccessArticle

Thermomechanical Studies of Yielding and Strain Localization Phenomena of Gum Metal under Tension

1
Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5 B, Warsaw 02-106, Poland
2
Toyota Central Research & Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
3
Department of Mechanical Engineering, Ibaraki University; 4-12-1, Nakanarusawa, Hitachi 316-8511, Japan
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 567; https://doi.org/10.3390/ma11040567
Received: 16 March 2018 / Revised: 4 April 2018 / Accepted: 4 April 2018 / Published: 7 April 2018
This paper presents results of investigation of multifunctional β-Ti alloy Gum Metal subjected to tension at various strain rates. Digital image correlation was used to determine strain distributions and stress-strain curves, while infrared camera allowed for us to obtain the related temperature characteristics of the specimen during deformation. The mechanical curves completed by the temperature changes were applied to analyze the subsequent stages of the alloy loading. Elastic limit, recoverable strain, and development of the strain localization were studied. It was found that the maximal drop in temperature, which corresponds to the yield limit of solid materials, was referred to a significantly lower strain value in the case of Gum Metal in contrast to its large recoverable strain. The temperature increase proves a dissipative character of the process and is related to presence of ω and α″ phases induced during the alloy fabrication and their exothermic phase transformations activated under loading. During plastic deformation, both the strain and temperature distributions demonstrate that strain localization for higher strain rates starts nucleating just after the yield limit leading to specimen necking and rupture. Macroscopically, it is exhibited as softening of the stress-strain curve in contrast to the strain hardening observed at lower strain rates. View Full-Text
Keywords: gum metal; yield limit; thermomechanical coupling; infrared thermography; digital image correlation; strain localization gum metal; yield limit; thermomechanical coupling; infrared thermography; digital image correlation; strain localization
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MDPI and ACS Style

Pieczyska, E.A.; Maj, M.; Golasiński, K.; Staszczak, M.; Furuta, T.; Kuramoto, S. Thermomechanical Studies of Yielding and Strain Localization Phenomena of Gum Metal under Tension. Materials 2018, 11, 567.

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