Near surface microstructures developing under large sliding loads

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02645312· OSTI ID:6767501

Hughes, D A; Dawson, D B; Korellis, J S; Weingarten, L I ^[1]

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1. Sandia National Labs., Livermore, CA (United States). Center for Materials and Applied Mechanics

The subsurface zones of copper developed during the application of large sliding loads were observed using TEM and SEM. Differences in microstructural development as a function of load and sliding velocity are assessed. The observed microstructural changes, such as the development of a dislocation substructure and a mechanically mixed layer, are used to estimate the stress and strain-state of the near surface zone during sliding. These estimates of local stress and strain were compared to the applied stresses to show that large stress concentrations develop at and below a sliding interface. Thus, the stresses which develop locally within the near surface zone can be many times larger than those predicted from the applied load and the friction coefficient. It is postulated that these stress concentrations arise from two sources: (1) asperity interactions and (2) local and momentary bonding between the two surfaces. These results are compared to various friction models.

• DOE Contract Number: AC04-94AL85000
• OSTI ID: 6767501
• Journal Information: Journal of Materials Engineering and Performance; (United States), Journal Name: Journal of Materials Engineering and Performance; (United States) Vol. 3:4; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
COPPER
DEFORMATION
ELECTRON MICROSCOPY
ELEMENTS
FRICTION
GRAIN REFINEMENT
METALS
MICROSCOPY
MICROSTRUCTURE
RECRYSTALLIZATION
SCANNING ELECTRON MICROSCOPY
SLIDING FRICTION
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
WEAR