COUPLED THERMO- MECHANICAL ANALYSIS OF SHEAR LOCALIZATION IN BULK METALLIC GLASSES | ||||
The International Conference on Applied Mechanics and Mechanical Engineering | ||||
Article 146, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Page 84-88 PDF (205.95 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/amme.2008.39832 | ||||
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Authors | ||||
EKAMBARAM R.1; THAMBURAJA P.2; NIKABDULLAH N.3 | ||||
1Graduate student, Department of Mechanical Engineering, National University of Singapore, Singapore. | ||||
2Assistant professor, Department of Mechanical Engineering, National University of Singapore, Singapore. | ||||
3Professor, Department of Mechanical Engineering, Universiti kembangsaan Malaysia, Malaysia. | ||||
Abstract | ||||
ABSTRACT A Coupled-thermo-mechanical, finite deformation based constitutive model to describe the deformation behavior of bulk metallic glasses was recently developed by Thamburaja and Ekambaram [1] and implemented in ABAQUS/Explicit (2007) finiteelement program by writing a user material sub-routine. In this work, the effectiveness of this temperature-displacement model, particularly while simulating the localizing behavior of metallic glasses which are deformed within the super-cooled liquid region is comprehensively analyzed. Numerical simulations were performed using the set of constitutive equations and list of material parameters from Thamburaja and Ekambaram [1] for Vitreloy-1 metallic glass. Coupled-temperature-displacement simulations were performed under specified deformation rates to study the shear localization phenomena for temperatures around and above the glass transition temperature. These deformation rates were obtained from the experimentally determined localization mapping from Lu, J. et. al. [2] for Vitreloy-1. The results from our finite element simulations could distinctively delineate the incidence of shear bands for strain rates well within the experimentally obtained range for localization, for ambient temperatures near the glass transition region. | ||||
Keywords | ||||
Metallic glass; Constitutive modelling; Viscoplasticity; Finite-elements | ||||
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