期刊
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
卷 60, 期 -, 页码 37-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2013.04.004
关键词
Bulk metallic glass; Shear band; Split-Hopkinson Pressure Bar (SHPB); Modelling of temperature evolution; Strain rate effects
Samples of La-based bulk metallic glass were tested under both static and dynamic compression, and their failure analysed. The strain rates imposed ranged from 10(-4)/s to 10(3)/s. Quasi-static compression was performed using an Instron universal testing machine and dynamic compression was applied by means of a Split-Hopkinson Pressure Bar (SHPB). This study focuses on: (1) Shear band characteristics under static and dynamic compression. A high-speed optical camera was used to capture visual images of shear band initiation; fracture surfaces were also examined by SEM; (2) Modelling of shear band temperature evolution within the specimen, with the aid of high-speed infrared camera images, to capture the temperature profile of the shear bands; (3) Effect of strain rate on response of La-based BMG. It is postulated that the negative strain rate dependence observed arises from the non-uniform direction of stress within the material, and stress concentration inside specimens. (c) 2013 Elsevier Ltd. All rights reserved.
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