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Interaction and coalescence of nanovoids and dynamic fracture in silica glass: multimillion-to-billion atom molecular dynamics simulations

Ken-ichi Nomura1, Yi-Chun Chen1, Wang Weiqiang1, Rajiv K Kalia1, Aiichiro Nakano1, Priya Vashishta1 and Lin H Yang2

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In this review, we present our recent results for atomistic mechanisms of damage nucleation and growth and dynamic fracture in silica glass. These results have been obtained with multimillion-to-billion atom, parallel, molecular dynamics simulations of (1) the interaction and coalescence of nanovoids in amorphous silica subjected to dilatational strain and (2) the nucleation, growth and healing of wing cracks and damage nanocavities in silica glass under impact loading. We also give an overview of our current efforts to perform dynamic fracture simulations over microsecond time scales and multiscale simulations of stress corrosion cracking in silica glass.


PACS

62.20.M- Structural failure of materials

61.43.Fs Glasses

61.43.Bn Structural modeling: serial-addition models, computer simulation

81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

61.72.Qq Microscopic defects (voids, inclusions, etc.)

61.43.Er Other amorphous solids

Subjects

Condensed matter: structural, mechanical & thermal

Dates

Issue 21 (7 November 2009)

Received 23 March 2009, in final form 24 March 2009

Published 22 October 2009



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