scholarly journals Tidal modulation of ice streams: Effect of periodic sliding velocity on ice friction and healing

2021 ◽  
Author(s):  
Christine McCarthy ◽  
Rob M Skarbek ◽  
Heather M Savage
Keyword(s):  
Sliding Velocity ◽  
Ice Streams ◽  
Ice Friction

scholarly journals Ice friction: the effect of thermal conductivity

2010 ◽  
Vol 56 (197) ◽  
pp. 473-479 ◽  
Author(s):  
Anne-Marie Kietzig ◽  
Savvas G. Hatzikiriakos ◽  
Peter Englezos
Keyword(s):  
Thermal Conductivity ◽  
Friction Coefficient ◽  
Boundary Friction ◽  
Sliding Velocity ◽  
Ice Friction ◽  
Mixed Friction ◽  
Friction Regime ◽  
Wide Range

AbstractThe effect of thermal conductivity on ice friction is studied systematically for different metallic slider materials over a wide range of temperatures, and sliding velocities. By thermally insulating the slider with fiberglass, the isolated effect of thermal conductivity on ice friction is investigated. A decrease of the friction coefficient in the boundary friction regime and an earlier onset of the mixed friction regime in terms of sliding velocity are found. Furthermore, the dependence of the ice friction coefficient on sliding velocity is compared for different sliding materials. It is found that the influence and importance of thermal conductivity decreases with increasing sliding velocity.

scholarly journals Ice friction, wear features and their dependence on sliding velocity and temperature

2005 ◽  
Vol 51 (174) ◽  
pp. 391-398 ◽  
Author(s):  
Brett A. Marmo ◽  
Jane R. Blackford ◽  
Chris E. Jeffree
Keyword(s):  
Plastic Deformation ◽  
Low Temperature ◽  
Wear Surface ◽  
Air Bubbles ◽  
Sliding Velocity ◽  
Low Friction ◽  
Low Velocity ◽  
Sliding Interface ◽  
Ice Friction ◽  
Temperature Scanning

AbstractFriction processes for ice samples sliding on steel have been determined by examining wear and debris morphology with low-temperature scanning electron microscopy and relating the processes to the velocity and temperature of formation. Friction experiments were carried out over a temperature range of −27 to −0.5°C and velocity range of 0.008–0.37 m s−1. Data were used to develop a friction map. Low friction (µ < 0.1) at high temperature (–3.4ºC)–low velocity (0.02 ms−1), and low temperature (–25.1ºC)–high velocity (0.30 ms−1) is due to the presence of liquid water which lubricates the sliding interface. Diagnostic morphologies for lubricated sliding include the presence of residual liquid in wear grooves and the development of a consolidated mass of debris on the trailing side of the wear surface with distinct grain boundaries and spheroidal air bubbles. High friction (µ > 0.15) at low temperature (−24.5ºC)–low velocity (0.03 m s−1) results from insufficient lubrication at the sliding interface, leading to plastic deformation. Diagnostic morphologies of plastic deformation include scuffing features on the wear surface and the accumulation of sheets of unconsolidated debris on the trailing edge of the wear surface.

Morphology of ice wear from rubber–ice friction tests and its dependence on temperature and sliding velocity

Wear ◽  
2008 ◽  
Vol 265 (5-6) ◽  
pp. 634-644 ◽  
Author(s):  
Daniel D. Higgins ◽  
Brett A. Marmo ◽  
Christopher E. Jeffree ◽  
Vasileios Koutsos ◽  
Jane R. Blackford
Keyword(s):  
Sliding Velocity ◽  
Ice Friction

scholarly journals The Influence of Isotropic Surface Roughness of Steel Sliders on Ice Friction Under Different Testing Conditions

Lubricants ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 106
Author(s):  
Velkavrh ◽  
Lungevičs ◽  
Jansons ◽  
Klien ◽  
Voyer ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Air Temperature ◽  
Normal Load ◽  
Environmental Parameters ◽  
Ambient Air ◽  
Sliding Velocity ◽  
Ice Surface ◽  
Ice Friction ◽  
The Coefficient Of Friction ◽  
Ice Surface Temperature

Ice friction is affected by various system and surface-related parameters such as ice temperature, ambient air temperature and humidity, relative sliding velocity, specific surface pressures and surface texture (waviness, roughness) as well as the macroscopic geometry of the samples. The influences of these parameters cannot be easily separated from each other. Therefore, ice friction is a very complex tribological system and it is challenging to draw sound conclusions from the experiments. In this work, ice friction experiments with stainless steel samples that have different isotropic surface roughness values were carried out. Two tribological experimental setups were used: (i) an inclined ice track where the sliding velocity of the freely sliding steel samples was determined and (ii) an oscillating tribometer, where the coefficient of friction was assessed. For both experimental setups, the environmental parameters such as air temperature, relative humidity and ice surface temperature as well as the test parameters such as normal load and surface pressure were kept as constant as possible. The results of the experiments are discussed in relation to the ice friction mechanisms and the friction regimes.

scholarly journals The Dynamics of Temperate Glaciers from the Detailed Viewpoint

1969 ◽  
Vol 8 (53) ◽  
pp. 185-205 ◽  
Author(s):  
L. Lliboutry
Keyword(s):  
Normal Pressure ◽  
Surface Velocity ◽  
Sliding Velocity ◽  
Theoretical Possibility ◽  
Ice Streams ◽  
Glacier Surface ◽  
Limited Region ◽  
Seismic Sounding ◽  
Image Position ◽  
The Right

The stresses and strains in a limited region of a temperate glacier are approximated by polynomials. In this case it seems that we can replace Glen’s law by the more convenient law . We initially consider a plane problem with a flat glacier surface. In a simple example the theoretical possibility of very important deviations from the classical relation τxz = ρgz sin α is demonstrated. The calculation is then extended to the more general case when the surface of the glacier is no longer a plane (the contours remaining always parallel) and where the width of the glacier varies.Starting from a precise survey of the surface and measurements of surface velocity, one can then obtain velocities and stresses at depth, and extrapolate the bedrock profile into regions inaccessible by seismic sounding. A provisional calculation has been made for the ice fall between the Glacier du Géant and the Glacier du Tacul (Mont-Blanc massif). In the lower part, the existence of a gorge near the right bank and the fact that the various ice streams partially superpose instead of flowing side by side, make the calculations uncertain.In this way the law of friction can be determined experimentally. Proceeding down-glacier, the sliding velocity decreases from about 830 m/year to about 250 m/year, while the normal pressure increases from about 2.8 to about 18.5 bar. At the same time the friction increases from about 1.1 to about 4.3 bar, approximately proportional to the pressure, which seems to be in agreement with the author’s theory of friction.

Effect of High Temperature on Wear Behavior of Stir Cast Aluminium/Boron Carbide Composites

2020 ◽  
Vol 22 (4) ◽  
pp. 1031-1046
Author(s):  
X. Canute ◽  
M. C. Majumder
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Boron Carbide ◽  
Wear Behavior ◽  
Base Alloy ◽  
Weight Fraction ◽  
Sliding Velocity ◽  
Wear Properties ◽  
High Temperature Wear ◽  
The Matrix

AbstractThe need for development of high temperature wear resistant composite materials with superior mechanical properties and tribological properties is increasing significantly. The high temperature wear properties of aluminium boron carbide composites was evaluated in this investigation. The effect of load, sliding velocity, temperature and reinforcement percentage on wear rate was determined by the pin heating method using pin heating arrangement. The size and structure of base alloy particles change considerably with an increase of boron carbide particles. The wettability and interface bonding between the matrix and reinforcement enhanced by the addition of potassium flurotitanate. ANOVA technique was used to study the effect of input parameters on wear rate. The investigation reveals that the load had higher significance than sliding velocity, temperature and weight fraction. The pin surface was studied with a high-resolution scanning electron microscope. Regression analysis revealed an extensive association between control parameters and response. The developed composites can be used in the production of automobile parts requiring high wear, frictional and thermal resistance.

Experimental Study of Ice Friction and Abrasion Test Methods for Polar Paint

2019 ◽  
Vol 56 (6) ◽  
pp. 532-540 ◽  
Author(s):  
Seong-Rak Cho ◽  
Eun-Jin Oh ◽  
Cheol-Hee Kim ◽  
Jae-Man Lee ◽  
Sung-Pyo Kim
Keyword(s):  
Experimental Study ◽  
Test Methods ◽  
Abrasion Test ◽  
Ice Friction

scholarly journals Cardioinotropic Effects in Subchronic Intoxication of Rats with Lead and/or Cadmium Oxide Nanoparticles

2021 ◽  
Vol 22 (7) ◽  
pp. 3466
Author(s):  
Svetlana V. Klinova ◽  
Boris A. Katsnelson ◽  
Ilzira A. Minigalieva ◽  
Oksana P. Gerzen ◽  
Alexander A. Balakin ◽  
...  
Keyword(s):  
Cadmium Oxide ◽  
Male Rats ◽  
Sliding Velocity ◽  
Muscle Type ◽  
In Vitro Motility Assay ◽  
Thin Filaments ◽  
In Vitro Motility ◽  
Toxic Impact ◽  
Cdo Nanoparticles

Subchronic intoxication was induced in outbred male rats by repeated intraperitoneal injections with lead oxide (PbO) and/or cadmium oxide (CdO) nanoparticles (NPs) 3 times a week during 6 weeks for the purpose of examining its effects on the contractile characteristics of isolated right ventricle trabeculae and papillary muscles in isometric and afterload contractions. Isolated and combined intoxication with these NPs was observed to reduce the mechanical work produced by both types of myocardial preparation. Using the in vitro motility assay, we showed that the sliding velocity of regulated thin filaments drops under both isolated and combined intoxication with CdO–NP and PbO–NP. These results correlate with a shift in the expression of myosin heavy chain (MHC) isoforms towards slowly cycling β–MHC. The type of CdO–NP + PbO–NP combined cardiotoxicity depends on the effect of the toxic impact, the extent of this effect, the ratio of toxicant doses, and the degree of stretching of cardiomyocytes and muscle type studied. Some indices of combined Pb–NP and CdO–NP cardiotoxicity and general toxicity (genotoxicity included) became fully or partly normalized if intoxication developed against background administration of a bioprotective complex.

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