Rock friction under variable normal stress

2017 ◽  
Vol 122 (9) ◽  
pp. 7042-7075 ◽  
Author(s):  
Brian Kilgore ◽  
N. M. Beeler ◽  
Julian Lozos ◽  
David Oglesby
Keyword(s):  
Normal Stress ◽  
Rock Friction

scholarly journals Temperature dependence of ice-on-rock friction at realistic glacier conditions

2017 ◽  
Vol 375 (2086) ◽  
pp. 20150348 ◽  
Author(s):  
C. McCarthy ◽  
H. Savage ◽  
M. Nettles
Keyword(s):  
Steady State ◽  
Temperature Dependence ◽  
Normal Stress ◽  
Velocity Dependence ◽  
Ice Streams ◽  
Experimental Conditions ◽  
Rock Friction ◽  
Load Point ◽  
Basal Sliding ◽  
Temperature Dependences

Using a new biaxial friction apparatus, we conducted experiments of ice-on-rock friction in order to better understand basal sliding of glaciers and ice streams. A series of velocity-stepping and slide–hold–slide tests were conducted to measure friction and healing at temperatures between −20°C and melting. Experimental conditions in this study are comparable to subglacial temperatures, sliding rates and effective pressures of Antarctic ice streams and other glaciers, with load-point velocities ranging from 0.5 to 100 µm s −1 and normal stress σ n  = 100 kPa. In this range of conditions, temperature dependences of both steady-state friction and frictional healing are considerable. The friction increases linearly with decreasing temperature (temperature weakening) from μ  = 0.52 at −20°C to μ  = 0.02 at melting. Frictional healing increases and velocity dependence shifts from velocity-strengthening to velocity-weakening behaviour with decreasing temperature. Our results indicate that the strength and stability of glaciers and ice streams may change considerably over the range of temperatures typically found at the ice–bed interface. This article is part of the themed issue ‘Microdynamics of ice’.

Micromechanics of the velocity and normal stress dependence of rock friction

1994 ◽  
Vol 143 (1-3) ◽  
pp. 303-315 ◽  
Author(s):  
Weibin Wang ◽  
Christopher H. Scholz
Keyword(s):  
Normal Stress ◽  
Stress Dependence ◽  
Rock Friction

Coupled thermoelasticity of shells of revolution - Effect of normal stress and coupling

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 496-504
Author(s):  
M. R. Eslami ◽  
M. Shakeri ◽  
A. R. Ohadi ◽  
B. Shiari
Keyword(s):  
Normal Stress ◽  
Shells Of Revolution ◽  
Coupled Thermoelasticity
Sign in / Sign up

Export Citation Format

Share Document