Hostname: page-component-8448b6f56d-wq2xx Total loading time: 0 Render date: 2024-04-25T03:51:14.198Z Has data issue: false hasContentIssue false
  • English
  • Français

Some Issues of Rough Surface Contact Plasticity at Micro- and Nano-Scales

Published online by Cambridge University Press:  01 February 2011

Y. F. Gao ,
A. F. Bower  and
K.-S. Kim
Y. F. Gao
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, U.S.A.
A. F. Bower
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, U.S.A.
K.-S. Kim
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, U.S.A.
Get access

Abstract

Rough surface contact plasticity at microscale and nanoscale is of crucial importance in many new applications and technologies, such as nano-imprinting and nano-welding. This paper summarizes our recent progress in understanding contact plasticity from a multiscale point of view, and also presents our perspectives. We first discuss a contact model based on fractal roughness and continuum plasticity theory. Interestingly, our simple, elastic-plastic contact model of the Weierstrass-Archard type gives rise to many practical scaling relations of contact pressure, contact compliance etc. The usefulness of those predictions is discussed for experimental measurements of the thermal/electrical contact resistance. A material length scale can be introduced by a nonlocal plasticity theory, or implicitly by dislocation mechanics modeling. The recent work on micro-plasticity of surface steps gives a variety of surface yielding and hardening behaviors, depending on interface adhesion, roughness features and slip systems. As a consequence, a rough surface contact at mesoscale can lead to the formation of a boundary layer with sub-layer dislocation structures, which cannot be predicted by existing strain gradient plasticity theories. The micromechanical analysis of surface plasticity could serve as the connection between microscale bulk dislocation plasticity and nanoscale atomistic simulations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 841: Symposium R – Fundamentals of Nanoindentation and Nanotribology III , 2004 , R7.3
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Forrest, S. R., Nature 428, 911–918 (2004).Google Scholar
2. Bhushan, B., Tribo. Lett. 4, 1–35 (1998).Google Scholar
3. Johnson, K.L., Contact mechanics, Cambridge Press (1985).Google Scholar
4. Ciavarella, M., Demelio, G., Barber, J. R. and Jang, Y. H., Proc. R. Soc. Lond. A 456, 387–405 (2000).Google Scholar
5. Gao, Y. F. and Bower, A. F., submitted (2004).Google Scholar
6. Hyun, S., Pei, L., Molinari, J.-F. and Robbins, M. O., Phys. Rev. E 70, 026117 (2004).Google Scholar
7. Pei, L., Hyun, S., Molinari, J.-F. and Robbins, M. O., submitted (2004).Google Scholar
8. Jang, Y. H. and Barber, J. R., J. Appl. Phys. 94, 7215–7221 (2003).Google Scholar
9. Barber, J. R., Proc. R. Soc. Lond. A 459, 53–66 (2003).Google Scholar
10. Ciavarella, M., Murolo, G., Demelio, G. and Barber, J. R., J. Mech. Phys. Solids 52, 1247–1265 (2004).Google Scholar
11. Nix, W. D. and Gao, H., J. Mech. Phys. Solids 46, 411–425 (1998).Google Scholar
12. Gao, Y. F. and Bower, A. F., unpublished work (2004).Google Scholar
13. Needleman, A., Acta Mater. 48, 105–124 (2000).Google Scholar
14. Polonsky, I. A. and Keer, L. M., Proc. R. Soc. Lond. A 452, 2173–2194 (1996).Google Scholar
15. Yu, H. H., Shrotriya, P., Gao, Y. F. and Kim, K.-S., unpublished work (2004).Google Scholar
16. Gao, Y. F., Yu, H. H. and Kim, K.-S., unpublished work (2004).Google Scholar
17. Cha, P.-R., Srolovitz, D. J. and Vanderlick, T. K., Acta Mater. 52, 3983–3996 (2004).Google Scholar