Nanowire Failure : Long = Brittle and Short = Ductile

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)910-914
Journal / PublicationNano Letters
Volume12
Issue number2
Online published3 Jan 2012
Publication statusPublished - 8 Feb 2012
Externally publishedYes

Abstract

Experimental studies of the tensile behavior of metallic nanowires show a wide range of failure modes, ranging from ductile necking to brittle/localized shear failure-often in the same diameter wires. We performed large-scale molecular dynamics simulations of copper nanowires with a range of nanowire lengths and provide unequivocal evidence for a transition in nanowire failure mode with change in nanowire length. Short nanowires fail via a ductile mode with serrated stress-strain curves, while long wires exhibit extreme shear localization and abrupt failure. We developed a simple model for predicting the critical nanowire length for this failure mode transition and showed that it is in excellent agreement with both the simulation results and the extant experimental data. The present results provide a new paradigm for the design of nanoscale mechanical systems that demarcates graceful and catastrophic failure. © 2012 American Chemical Society.

Research Area(s)

  • brittle shear failure, Copper nanowire, ductile necking, length effect, molecular dynamics simulations

Citation Format(s)

Nanowire Failure : Long = Brittle and Short = Ductile. / Wu, Zhaoxuan; Zhang, Yong-Wei; Jhon, Mark H.; Gao, Huajian; Srolovitz, David J.

In: Nano Letters, Vol. 12, No. 2, 08.02.2012, p. 910-914.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review