J. Phys. IV France
Volume 08, Numéro PR8, November 19982nd European Mechanics of Materials Conference on Mechanics of Materials with Intrinsic Length Scale : Physics, Experiments, Modelling and Applications
|Page(s)||Pr8-79 - Pr8-86|
J. Phys. IV France 08 (1998) Pr8-79-Pr8-86
Second gradient vs. surface energy in the Asaro-Grinfeld instabilityA. Danescu and F. Sidoroff
École Centrale de Lyon, LTDS, UMR 5513, 36 avenue Guy de Collongue, 69131 Écully cedex, France
This paper study an instability phenomenon that arise in epitaxial growth of single crystals with lattice mismatch. We compare a classical approach, based on the competition between the bulk and surface energies, with a non-standard one when the surface term is replaced by a term including the second gradient of the displacement field. We evidence how secontl order gradients may stabilize lower modes of corrugated boundaries, via an intrisic length scale.
© EDP Sciences 1998