Spontaneous thermal runaway as an ultimate failure mechanism of materials

Details

Serval ID
serval:BIB_89AD16EAD3B4
Type
Article: article from journal or magazin.
Collection
Publications
Title
Spontaneous thermal runaway as an ultimate failure mechanism of materials
Journal
Physical Review Letters
Author(s)
Braeck S., Podladchikov Y.Y.
ISSN-L
0031-9007
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
98
Pages
095504
Language
english
Abstract
The first theoretical estimate of the shear strength of a perfect
crystal was given by Frenkel [Z. Phys. 37, 572 (1926)]. By assuming
that two rigid atomic rows in the crystal would move over each other
along a slip plane, he derived the ultimate shear strength to be about
one-tenth of the shear modulus. Here we present a theoretical study
showing that catastrophic failure of viscoelastic materials may occur
below Frenkel's ultimate limit as a result of thermal runaway. The
thermal runaway failure mechanism exhibits progressive localization of
the strain and temperature profiles in space, thereby producing a narrow
region of highly deformed material, i.e., a shear band. We calculate the
maximum shear strength sigma(c) of materials and then demonstrate the
relevance of this new concept for material failure known to occur at
scales ranging from nanometers to kilometers.
Create date
09/10/2012 19:50
Last modification date
20/08/2019 14:48
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