Campus Units

Mechanical Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2-2006

Journal or Book Title

Experimental Mechanics

Volume

46

Issue

1

First Page

39

Last Page

46

DOI

10.1007/s11340-006-5864-3

Abstract

Surface roughness plays an important role in the delamination wear caused by rough surface contact. A recent dislocation model analysis predicts that nano-scale contacts of surface steps induce nucleation of dislocations leading to pro-load and anti-load dislocation segregation near the contact surface. Such dislocation segregation generates a sub-layer of tensile residual stress in a much thicker layer of compressive residual stress near the surface. The tensile sub-layer thickness is expected to be about 50 to 100 times the step height. In order to verify the predictions of the model analysis, contact experiments are carried out on polycrystalline aluminum surface to determine the existence of the tensile sub-layer. The variation of the residual stress along the thickness direction is measured using a newly developed high sensitivity curvature-measurement interferometer. The residual stress distribution measured with sub-nanometer spatial resolution indicates that contact loading leads to formation of a highly stressed sub-layer of tensile residual stress within a much thicker layer of compressive residual stress. Implications of tensile residual stress for delamination wear are discussed.

Comments

This is a post-peer-review, pre-copyedit version of an article published in Experimental Mechanics. The final authenticated version is available online at: 10.1007/s11340-006-5864-3. Posted with permission.

Copyright Owner

Society for Experimental Mechanics

Language

en

File Format

application/pdf

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