Issue |
Europhys. Lett.
Volume 38, Number 2, April II 1997
|
|
---|---|---|
Page(s) | 103 - 106 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00208-x | |
Published online | 01 September 2002 |
On the transition from brittle to plastic failure in breaking a nanocrystal under tension (NUT)
IBM Research Division, Almaden Research Center - San Jose, CA 95120-6099
Received:
6
January
1997
Accepted:
4
March
1997
We are simulating the dynamical failure of three-dimensional notched
solids under tension using molecular dynamics, simple interatomic
force laws and system sizes from 10 to more than 100 millions
atoms.
The rare-gas solid will cleave brittlely at failure
under mode I loading in the
direction. With sufficient loading, the
crack velocity can reach a speed where a transition from brittle
failure to ductile failure occurs. We show that this critical speed
is independent of the loading history and is approximately 0.36 of
the Rayleigh sound speed, consistent with our suggestion that this
transition is initiated by an intrinsic instability in the crack
dynamics.
PACS: 62.20.Mk – Fatigue, brittleness, fracture, and cracks / 46.30.Pa – Friction, wear, adherence, hardness, mechanical contacts, and tribology / 81.40.Np – Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
© EDP Sciences, 1997
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