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Effect of patterned nanoscale interfacial roughness on interfacial toughness: A finite element analysis

Published online by Cambridge University Press:  31 January 2011

E.D. Reedy Jr.
E.D. Reedy Jr.*
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-0346
*
a)Address all correspondence to this author. e-mail: edreedy@sandia.gov
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Abstract

A finite element analysis was used to determine how patterned, nanoscale interfacial roughness could potentially increase the apparent interfacial toughness of brittle, thin-film material systems. The pattern analyzed was composed of parallel channels with either a rectangular-toothed or a rippled cross-section. Results are presented for a thin, linear elastic, bimaterial strip loaded by displacing the top edge relative to the bottom edge. The finite element calculations indicate that the interface does not unzip in a steady, continuous manner. Instead, the crack tip stalls as it tries to kink in a direction that is offset from its original path. The apparent interfacial toughness is found to depend on the intrinsic interfacial toughness, the ratio of real-to-nominal interfacial area, the extent of ligament, tooth-tip damage that occurs before crack propagation, strain energy locked in by persistent contact, and the level of energy dissipation associated with dynamic fracture.

Keywords

FractureNanoscaleToughness
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 3056 - 3065
Copyright
Copyright © Materials Research Society 2008

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