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Metals 2016, 6(9), 217; doi:10.3390/met6090217

Numerical Modeling of Cyclic Deformation in Bulk Metallic Glasses

State Key Laboratory of Mechanics and Control of Mechanical, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Academic Editor: Hugo F. Lopez
Received: 24 July 2016 / Revised: 12 August 2016 / Accepted: 27 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Amorphous Alloys and Related Transitions)
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Abstract

In this paper, a systematic numerical simulation was performed to elucidate the damage mechanisms in bulk metallic glasses (BMGs) subjected to the tension-compression cyclic loading, and then the relation between fatigue life, applied strain, and cycling frequency was therefore presented. The free volume was selected as an internal state variable to depict the shear-band nucleation, growth, and coalescence with the help of free volume theory, which was incorporated into the ABAQUS code via a user material subroutine UMAT. Under cyclic loading, the shear banding initiation mainly stems from the microstructure inhomogeneity in BMGs and, further, the effect of applied strain amplitude and cycling frequency was discussed. The present simulations will shed some light on the fatigue damage mechanisms and fatigue life evaluation of BMG structures. View Full-Text
Keywords: bulk metallic glasses (BMGs); finite element method (FEM); shear-band; fatigue life; cycle loading bulk metallic glasses (BMGs); finite element method (FEM); shear-band; fatigue life; cycle loading
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jiang, Y. Numerical Modeling of Cyclic Deformation in Bulk Metallic Glasses. Metals 2016, 6, 217.

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