期刊
PHILOSOPHICAL MAGAZINE LETTERS
卷 91, 期 11, 页码 705-712出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2011.609150
关键词
metallic glass; thermo-mechanical model; finite element modeling
类别
资金
- NSF [NSF-0907320]
Shear band (SB) velocity is a key parameter in assessing the dynamic behavior and also deformation mechanisms of metallic glasses. Using a coupled thermo-mechanical model, we calculated the speed of SB propagation in Vitreloy 1 (Zr41.25Ti13.75Ni10Cu12.5Be22.5) under compression at a strain rate of 10 s(-1). The propagation of the SB exhibits a non-uniform speed: a rather slow stage followed by a rapid propagation when the SB is close to the sample surface or at failure. The average speed is estimated to be about 100 m/s, while the maximum speed could reach 1400 m/s. The impact of the varying SB velocity on measurement relying on surface detection such as thermographic images, strain gauge, and surface offsets is discussed.
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