On the mechanism of deformation and failure in bulk metallic glasses
作者： JC Li , Q Wei , XW Chen , FL Huang , None
DOI: 10.1016/J.MSEA.2014.04.106
关键词: Coalescence (physics) 、 Amorphous metal 、 Test data 、 Strain rate 、 Volume concentration 、 Supercooling 、 Forensic engineering 、 Constitutive equation 、 Materials science 、 Hydrostatic stress 、 Mechanics
摘要: Abstract Based on the coupled thermo-mechanical model, a constitutive model for bulk metallic glasses (BMGs), which considers effects of free volume, temperature and hydrostatic stress, has been further deduced generalized to multi-axial stress status in present manuscript. Besides, failure criterion critical volume concentration is introduced from coalescence mechanism volume. Then are implemented into LS-DYNA commercial software through user material subroutine (UMAT). Integrated with related test data, FEM simulations different deformation scenarios conducted. The evolutions parameters corresponding mechanical behaviors BMGs analyzed, especially strain rate, initial as well discussed detail. It demonstrates that multi-axial-stress-status able describe at temperatures (below within supercooled liquid region) rates universally.
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