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.
Copyright Owner
Society for Experimental Mechanics
Copyright Date
2006
Language
en
File Format
application/pdf
Recommended Citation
Wang, J.; Shrotriya, Pranav; and Kim, K.-S., "Surface Residual Stress Measurement Using Curvature Interferometry" (2006). Mechanical Engineering Publications. 388.
https://lib.dr.iastate.edu/me_pubs/388
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.