Přístupnostní navigace
E-application
Search Search Close
Publication detail
ČERNÝ, M. ŘEHÁK, P. POKLUDA, J.
Original Title
The origin of lattice instability in bcc tungsten under triaxial loading
Type
journal article in Web of Science
Language
English
Original Abstract
Stability of ideal bcc tungsten crystal under triaxial tensile loading was explored from first principles using an analysis of both elastic and dynamic stability. The triaxial stress state was considered a superposition of axial and biaxial transverse stresses. The region of attainable stresses which was delimited using the computed tensile stress maxima was marginally reduced by occurrence of soft phonons in the crystal lattice. While, under purely hydrostatic tension, the crystal was predicted stable up to 48GPa, greater magnitude of a differential stress reduced the value of a mean (hydrostatic) stress associated with first phonon instabilities to about 35GPa. This value is rather close to that recently determined in experiment. Computed phonon spectra were successfully verified with the help of atomistic models of microscopic lattice deformation.
Keywords
theoretical strength; triaxial loading; stress superposition; soft phonons; ab initio calculations
Authors
ČERNÝ, M.; ŘEHÁK, P.; POKLUDA, J.
Released
12. 11. 2017
ISBN
1478-6443
Periodical
PHILOSOPHICAL MAGAZINE
Year of study
97
Number
32
State
United Kingdom of Great Britain and Northern Ireland
Pages from
2971
Pages to
2984
Pages count
14
BibTex
@article{BUT138181, author="Miroslav {Černý} and Petr {Řehák} and Jaroslav {Pokluda}", title="The origin of lattice instability in bcc tungsten under triaxial loading", journal="PHILOSOPHICAL MAGAZINE", year="2017", volume="97", number="32", pages="2971--2984", doi="10.1080/14786435.2017.1363424", issn="1478-6443" }