nanoindentation.pdf (2.11 MB)
0/0

Atomistic-scale modelling of nanoindentation into optical coatings

Download (2.11 MB)
journal contribution
posted on 01.02.2013 by Ismail Gheewala, Steven Kenny, Roger Smith
Simulations of nanoindentation into a typical optical-coatings stack employed in energy efficient glazing have been performed using classical molecular dynamics (MD) and a coupled finite element/MD methodology. The coatings stack consists of a low-emissivity material, Ag, sandwiched between two layers of a transparent conducting oxide (TCO), ZnO. Simulations into both the ZnO and the coatings stack show a strong interaction between the tip symmetry and crystal symmetry in the observed displacement field. A large amount of elastic recovery is observed for both the ZnO system and the coatings stack, but with an impression left on the surface that looks like a crack but extends no further than the tip imprint at maximum depth. The full stack is observed to have a lower hardness once there is a significant penetration of the displacement field into the Ag, when compared to the pure ZnO system. A comparison between the coupled finite element/MD methodology and the fixed boundary MD-only model shows that the boundary conditions have little influence on the calculated results.

History

School

  • Science

Department

  • Mathematical Sciences

Citation

GHEEWALA, I., KENNY, S.D. and SMITH, R., 2009. Atomistic-scale modelling of nanoindentation into optical coatings. Philosophical Magazine, 89 (34-36), pp. 3499 - 3510.

Publisher

© Taylor & Francis

Version

AM (Accepted Manuscript)

Publication date

2009

Notes

This paper was published in the Philosophical Magazine [© Taylor & Francis] and the definitive version is available at: http://dx.doi.org/10.1080/14786430903321412

ISSN

1478-6435

Language

en

Exports