scholarly journals Adiabatic shear banding instability in bulk metallic glasses

2005 ◽  
Vol 87 (14) ◽  
pp. 141916 ◽  
Author(s):  
L. H. Dai ◽  
M. Yan ◽  
L. F. Liu ◽  
Y. L. Bai
Keyword(s):  
Metallic Glasses ◽  
Shear Banding ◽  
Bulk Metallic Glasses ◽  
Adiabatic Shear ◽  
Adiabatic Shear Banding

scholarly journals On the Quantitative Evaluation of Adiabatic Shear Banding Sensitivity of Various Titanium Alloys

1997 ◽  
Vol 07 (C3) ◽  
pp. C3-429-C3-434 ◽  
Author(s):  
C. Mazeau ◽  
L. Beylat ◽  
P. Longère ◽  
P. F. Louvigné
Keyword(s):  
Titanium Alloys ◽  
Quantitative Evaluation ◽  
Shear Banding ◽  
Adiabatic Shear ◽  
Adiabatic Shear Banding

Stability of shear banding process in bulk metallic glasses and composites

2017 ◽  
Vol 32 (13) ◽  
pp. 2560-2569 ◽  
Author(s):  
Yusheng Qin ◽  
Xiaoliang Han ◽  
Kaikai Song ◽  
Li Wang ◽  
Yun Cheng ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Banding ◽  
Bulk Metallic Glasses ◽  
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Abstract

Multi-step shear banding for bulk metallic glasses at ambient and cryogenic temperatures

2012 ◽  
Vol 136 (1) ◽  
pp. 75-79 ◽  
Author(s):  
J.W. Qiao ◽  
H.L. Jia ◽  
Y. Zhang ◽  
P.K. Liaw ◽  
L.F. Li
Keyword(s):  
Metallic Glasses ◽  
Shear Banding ◽  
Bulk Metallic Glasses ◽  
Cryogenic Temperatures

A Dislocation Pile-Up Computation for Adiabatic Shear Banding

2014 ◽  
Vol 1650 ◽  
Author(s):  
Stephen D. Antolovich ◽  
Ronald W. Armstrong
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Temperature Increase ◽  
Shear Banding ◽  
Low Carbon Steel ◽  
Adiabatic Shear ◽  
Dislocation Velocity ◽  
Low Carbon ◽  
Adiabatic Shear Banding ◽  
Pile Up

ABSTRACTA model is presented for computing the temperature increase associated with the formation of an adiabatic shear band. The hypothesis is that the heating is supplied by the difference in energy of a pile-up of n dislocations and the energy of n individual dislocations. The heating is assumed to occur within a volume determined by the grain size (i.e. slip band length) and an effective thermal length determined by the dislocation velocity. The model predicts increases in temperature with increasing shear modulus (G), increasing numbers of piled up dislocations (n), increasing Burgers vector (b), increased grain size (d), and increased dislocation velocity (vd). Increasing temperature is also predicted with decreasing heat capacity (c*) and thermal diffusivity (α) as would be expected. The model was applied to low carbon steel for which considerable data are available. Application to low carbon steel gives a temperature increase of about 1400K. The implied result that untempered martensite should be observed after adiabatic shear banding is in agreement with examples cited in the literature. Further investigation into the dynamics of pile-up release and the associated heat transfer mechanisms is discussed.

Dependence of the Coefficient of Friction on the Sliding Conditions in the High Velocity Range

1999 ◽  
Vol 121 (1) ◽  
pp. 35-41 ◽  
Author(s):  
A. Molinari ◽  
Y. Estrin ◽  
S. Mercier
Keyword(s):  
Coefficient Of Friction ◽  
High Velocity ◽  
Numerical Solutions ◽  
Constitutive Relations ◽  
Shear Banding ◽  
Normal Pressure ◽  
Adiabatic Shear ◽  
Velocity Range ◽  
Adiabatic Shear Banding ◽  
The Coefficient Of Friction

The velocity, normal pressure, and slider size dependence of the coefficient of dry friction of metals in the range of high sliding velocities (V ≥ 1 m/s) is investigated theoretically. Failure of the adhesive junctions by adiabatic shear banding is considered as the underlying process. The concept of asperity shearing by the adiabatic shear banding mechanism represents a new approach to unlubricated high velocity friction. Analytical solutions of a coupled thermomechanical problem are given for two constitutive relations. Numerical solutions for steel-on-steel friction showing a decrease of the coefficient of friction with the sliding velocity for different normal pressures are presented. The model is considered to be adequate in the velocity range of 1–10 m/s where friction enhanced oxidation or surface melting are believed not to interfere with the asperity shearing process.

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