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UMENO, Y. ČERNÝ, M.
Original Title
Effect of normal stress on the ideal shear strength in covalent crystals
Type
journal article in Web of Science
Language
English
Original Abstract
Critical shear stress under the superimposed hydrostatic and uniaxial normal stress conditions of C, Si, Ge, and SiC is evaluated by ab initio density functional theory calculations to investigate the response of ideal shear strength (ISS) to superimposed normal stresses in covalent crystals. We find a substantial difference in the responses of ISS to normal stress among the covalent crystals examined; e.g., hydrostatic compression increases the ISS of C but decreases that of Si, Ge, and SiC. The ISS is mostly a highly nonlinear and anisotropic function of normal stress. The results thus indicate that normal stresses can significantly affect the critical shear stress, which is crucial to interpreting experimental observations of crystal deformation, e.g., dislocation nucleation in nanoindentation.
Keywords
shear strength, normal stress, ab initio
Authors
UMENO, Y.; ČERNÝ, M.
RIV year
2008
Released
10. 3. 2008
Publisher
AMER PHYSICAL SOC
Location
ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
ISBN
1098-0121
Periodical
PHYSICAL REVIEW B
Year of study
77
Number
3
State
United States of America
Pages from
100101
Pages to
100101-4
Pages count
4