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An Evaluation of Atomic Force Microscopy as a Probe of Nanoscale Residual Stress Via Atomistic Simulation

Published online by Cambridge University Press:  10 February 2011

O. Shenderova ,
J. Mewkill ,
P. Linehan ,
D. W. Brenner ,
K. Jarausch  and
P. E. Russell
O. Shenderova
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
J. Mewkill
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
P. Linehan
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
D. W. Brenner
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
K. Jarausch
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
P. E. Russell
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907
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Abstract

Results from a series of molecular dynamics simulations are reported in which a nanoscale tip was used to indent gold lattices subjected to external strains. The changes in the slope of the loading curves reflect the stress state of the sample. This was true even in the absence of material pile-up, suggesting that the change in loading reflects changes in elastic properties of materials and not a change in contact area due to pile-up. Shallow nanoindentation was also evaluated as a method to map residual surface stresses by simulating indentation at a series of points near a dislocation intersecting a surface. Correlations between the maximum force on the tip and the initial local stresses at the point of indentation were observed. Thus, preliminary atomistic simulations indicate that atomic-force microscopy can be used as a nondestructive, nanoscale probe of the surface stress distributions

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 233
Copyright
Copyright © Materials Research Society 1998

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