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RISCrack Propagation in Rolling Line Contacts
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The stress intensity factors for short straight and branched subsurface cracks subjected to a Hertzian loading are calculated by the finite element method. The effect of crack face friction on ...
Thermal Non-Newtonian Elastohydrodynamic Lubrication of Rolling Line Contacts
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The two-dimensional thermal elastohydrodynamic equations were numerically solved for a Ree-Eyring type lubricant under pure rolling conditions. Profiles of lubricant pressure, film thickness, and ...
The Mechanics of Crack Initiation at Hard Particles in Rolling Line Contacts
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The mechanics of crack initiation in rolling contact bearings is investigated by considering the possibility of hard particle debonding from the surrounding softer matrix. The local elastoplastic ...
Delamination Wear of Dispersion-Hardened Alloys
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In order to investigate the effect of hard incoherent dispersoids on the sliding wear rate of dispersion-hardened alloys, internally oxidized Cu-Cr and Cu-Si alloys were tested. OFHC copper and ...
The Mechanism of Friction in Boundary Lubrication
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The primary friction mechanism between boundary-lubricated sliding surfaces was investigated. Experiments were performed on well-polished aluminum, copper, and chromium using mineral oil lubricant. ...
The Role of Hard Layers in Lubricated and Dry Sliding
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Lubricated and dry experiments on titanium and steel surfaces with and without TiN sputtered coatings of various thicknesses have been conducted. The significance of the layer thickness, interfacial ...
Plowing Friction in Dry and Lubricated Metal Sliding
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Experimental evidence for plowing under dry and lubricated sliding conditions is presented and analytical expressions for the coefficient of friction due to plowing are obtained. The theoretical ...
The Significance of Oxide Layers in Boundary Lubrication
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Analytical and experimental studies were conducted on oxidized and nonoxidized pure aluminum, OFHC copper, and electroplated chromium to investigate the role of surface oxide layers in boundary ...
The Coefficients of Thermal Expansion of La2O3, TaVO5 and Ta16W18O94 Below Room Temperature
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The coefficients of thermal expansion (CTE) of La2 O3 , TaVO5 and Ta16 W18 O94 were measured in the temperature range 150–300 K for space applications. Hot pressed La2 O3 showed a positive ...
The Coefficient of Thermal Expansion of a Super Invar-Ta16W18O94 Composite
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The coefficient of thermal expansion (CTE) of a hot pressed Ta16 W18 O94 which was produced from Ta2 O5 and WO3 powders was found to be −1.52×10−6 K−1 in the temperature range 180–330 ...