Thermomechanical Studies of Yielding and Strain Localization Phenomena of Gum Metal under Tension
Autor: | Elżbieta A. Pieczyska, Michał Maj, Karol Golasiński, Maria Staszczak, Tadahiko Furuta, Shigeru Kuramoto |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
gum metal
yield limit thermomechanical coupling infrared thermography digital image correlation strain localization Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
Zdroj: | Materials, Vol 11, Iss 4, p 567 (2018) |
Druh dokumentu: | article |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma11040567 |
Popis: | 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. |
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