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contributor authorA. Kadiric
contributor authorXiao Bo Zhou
contributor authorE. Ioannides
contributor authorR. S. Sayles
date accessioned2017-05-09T00:11:27Z
date available2017-05-09T00:11:27Z
date copyrightOctober, 2003
date issued2003
identifier issn0742-4787
identifier otherJOTRE9-28718#720_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/129105
description abstractThe paper employs a rough-surface numerical elastic contact method designed to analyze Hertzian elastic contact effects of surface coatings. In particular the paper explores the differences in the surface contact mechanics and the resulting sub-surface stresses experienced over a range of differing coating material-properties, thickness, and machined roughness levels in a quantitative manner. The effect of a range of surface roughness properties and in particular root mean square roughness (σ) and correlation length (β*), on the magnitude and depth of maximum shear stresses in the layer under individual asperities is investigated. This is done for a hard and stiff, and also for a soft and compliant coating, and for two coating thicknesses in each case. The results suggest that the magnitude of the local shear stress increases with increasing ratio σ/β* approximately linearly. The depth of the maximum local shear stress is found to correlate best with β*, however a further clear trend is observed between this depth and the number of profile peaks. The depth also shows a relation to the ratio σ/β* but the correlation in this case is weaker with significant deviations. Neither the magnitude nor the depth of shear stresses shows any significant trend in relation to the roughness (σ) alone. The tensile stresses at the interface, and the subsequent potential for delamination, are also investigated and found to be significant. Approximate correlation between the magnitude of interface tensile stress and root mean square roughness is achieved, but no clear trend in relation to correlation length is evident.
publisherThe American Society of Mechanical Engineers (ASME)
titleA Numerical Study of the Contact Mechanics and Sub-Surface Stress Effects Experienced Over a Range of Machined Surface Coatings in Rough Surface Contacts
typeJournal Paper
journal volume125
journal issue4
journal titleJournal of Tribology
identifier doi10.1115/1.1574520
journal fristpage720
journal lastpage730
identifier eissn1528-8897
keywordsCoating processes
keywordsCoatings
keywordsSurface roughness
keywordsStress
keywordsShear (Mechanics) AND Thickness
treeJournal of Tribology:;2003:;volume( 125 ):;issue: 004
contenttypeFulltext


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