Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2008, Article ID 380961, 5 pages
http://dx.doi.org/10.1155/2008/380961
Research Article

Dislocation Nucleation and Pileup under a Wedge Contact at Nanoscale

1Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
2Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77251, USA

Received 5 November 2007; Accepted 18 January 2008

Academic Editor: Junlan Wang

Copyright © 2008 Y. F. Gao and J. Lou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. W. D. Nix and H. Gao, “Indentation size effects in crystalline materials: a law for strain gradient plasticity,” Journal of the Mechanics and Physics of Solids, vol. 46, no. 3, pp. 411–425, 1998. View at Publisher · View at Google Scholar
  2. J. G. Swadener, E. P. George, and G. M. Pharr, “The correlation of the indentation size effect measured with indenters of various shapes,” Journal of the Mechanics and Physics of Solids, vol. 50, no. 4, pp. 681–694, 2002. View at Publisher · View at Google Scholar
  3. J. Lou, P. Shrotriya, T. Buchheit, D. Yang, and W. O. Soboyejo, “Nanoindentation study of plasticity length scale effects in LIGA Ni microelectromechanical systems structures,” Journal of Materials Research, vol. 18, no. 3, pp. 719–728, 2003. View at Google Scholar
  4. G. Feng and W. D. Nix, “Indentation size effect in MgO,” Scripta Materialia, vol. 51, no. 6, pp. 599–603, 2004. View at Publisher · View at Google Scholar
  5. Z. Zong, J. Lou, O. O. Adewoye, A. A. Elmustafa, F. Hammad, and W. O. Soboyejo, “Indentation size effects in the nano- and micro-hardness of fcc single crystal metals,” Materials Science and Engineering A, vol. 434, no. 1-2, pp. 178–187, 2006. View at Publisher · View at Google Scholar
  6. J. Lou, P. Shrotriya, S. Allameh, T. Buchheit, and W. O. Soboyejo, “Strain gradient plasticity length scale parameters for LIGA Ni MEMs thin films,” Materials Science and Engineering A, vol. 441, no. 1-2, pp. 299–307, 2006. View at Publisher · View at Google Scholar
  7. W. D. Nix, J. R. Greer, G. Feng, and E. T. Lilleodden, “Deformation at the nanometer and micrometer length scales: effects of strain gradients and dislocation starvation,” Thin Solid Films, vol. 515, no. 6, pp. 3152–3157, 2007. View at Publisher · View at Google Scholar
  8. H. Bei, E. P. George, J. L. Hay, and G. M. Pharr, “Influence of indenter tip geometry on elastic deformation during nanoindentation,” Physical Review Letters, vol. 95, no. 4, Article ID 045501, pp. 1–4, 2005. View at Publisher · View at Google Scholar
  9. A. Widjaja, A. Needleman, and E. van der Giessen, “The effect of indenter shape on sub-micron indentation according to discrete dislocation plasticity,” Modelling and Simulation in Materials Science and Engineering, vol. 15, no. 1, pp. S121–S131, 2007. View at Publisher · View at Google Scholar
  10. Y. Huang, F. Zhang, K. C. Hwang, W. D. Nix, G. M. Pharr, and G. Feng, “A model of size effects in nano-indentation,” Journal of the Mechanics and Physics of Solids, vol. 54, no. 8, pp. 1668–1686, 2006. View at Publisher · View at Google Scholar
  11. K. L. Johnson, Contact Mechanics, Cambridge University Press, Cambridge, UK, 1985.
  12. J. R. Rice and R. Thomson, “Ductile versus brittle behavior of crystals,” Philosophical Magazine, vol. 29, no. 1, pp. 73–97, 1973. View at Publisher · View at Google Scholar
  13. H. H. Yu, P. Shrotriya, Y. F. Gao, and K.-S. Kim, “Micro-plasticity of surface steps under adhesive contact: part I-surface yielding controlled by single-dislocation nucleation,” Journal of the Mechanics and Physics of Solids, vol. 55, no. 3, pp. 489–516, 2007. View at Publisher · View at Google Scholar
  14. Y. F. Gao, B. N. Lucas, J. C. Hay, W. C. Oliver, and G. M. Pharr, “Nanoscale incipient asperity sliding and interface micro-slip assessed by the measurement of tangential contact stiffness,” Scripta Materialia, vol. 55, no. 7, pp. 653–656, 2006. View at Publisher · View at Google Scholar
  15. Y. F. Gao, H. T. Xu, W. C. Oliver, and G. M. Pharr, “A comparison of Coulomb friction and friction stress models based on multidimensional nanocontact experiments,” to appear in Journal of Applied Mechanics.
  16. Z. Suo, “Singularities interacting with interfaces and cracks,” International Journal of Solids and Structures, vol. 25, no. 10, pp. 1133–1142, 1989. View at Publisher · View at Google Scholar
  17. H. Tada, P. C. Paris, and G. R. Irwin, The Stress Analysis of Cracks Handbook, ASME Press, New York, NY, USA, 2000.
  18. Y. F. Gao, H. T. Xu, W. C. Oliver, and G. M. Pharr, “Effective elastic modulus of film-on-substrate systems under normal and tangential contact,” Journal of the Mechanics and Physics of Solids, vol. 56, no. 2, pp. 402–416, 2008. View at Google Scholar
  19. R. A. Mirshams and P. Parakala, “Nanoindentation of nanocrystalline Ni with geometrically different indenters,” Materials Science and Engineering A, vol. 372, no. 1-2, pp. 252–260, 2004. View at Publisher · View at Google Scholar