scholarly journals Mesoscopic Constitutive Model for Predicting Failure of Bulk Metallic Glass Composites Based on the Free-Volume Model

Materials ◽  
2018 ◽  
Vol 11 (2) ◽  
pp. 327 ◽  
Author(s):  
Yunpeng Jiang
Keyword(s):  
Metallic Glass ◽  
Constitutive Model ◽  
Bulk Metallic Glass ◽  
Free Volume ◽  
Glass Composites ◽  
Volume Model ◽  
Bulk Metallic Glass Composites ◽  
Free Volume Model

Numerical Analysis of the Impact Fracture of Metallic Glass Based on Free Volume Model

2019 ◽  
Vol 794 ◽  
pp. 188-193 ◽  
Author(s):  
Tsutomu Umeda ◽  
Koji Mimura
Keyword(s):  
Fracture Surface ◽  
Metallic Glass ◽  
Constitutive Model ◽  
Strain Rate ◽  
Free Volume ◽  
Amorphous Metals ◽  
Yield Behavior ◽  
Volume Model ◽  
Free Volume Model ◽  
The Impact

The yield behavior of amorphous metals including the metallic glass shows intrinsic dependence on the hydrostatic stress, so that yield criterion models such as Mohr-Coulomb and Drucker-Prager are often used. Both the models can explain the asymmetry in the yield stress under uniaxial compression and tension conditions, while the asymmetry in the angle of fracture surface is not able to be determined based on any of those models. The free volume model is able to provide that foundation. Shibutani et al. proposed a new constitutive model for amorphous metals that was derived from some free volume models and the flow rule using the Drucker-Prager yield function as a plastic potential, and investigated the yield behavior and the formation of localized shear band under some temperature conditions using the implicit static FEM code. The formation of shear bands is an unstable phenomenon that is greatly affected by the initial imperfection. In this model, on the other hand, the temperature or the strain rate also affects the yield behavior considerably. In this study, the impact fracture of metallic glass was investigated by implementing the constitutive model proposed by Shibutani et al. into the explicit dynamic FEM code DYNA3D, with laying emphasis on reproducing asymmetry in the angle of fracture surface and the examination of effects of strain rate and temperature change.

Shear fracture in bulk metallic glass composites

2021 ◽  
pp. 116963
Author(s):  
Devashish Rajpoot ◽  
R. Lakshmi Narayan ◽  
Long Zhang ◽  
Punit Kumar ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Shear Fracture ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites
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