Detail publikace

Effect of normal stress on the ideal shear strength in covalent crystals

UMENO, Y. ČERNÝ, M.

Originální název

Effect of normal stress on the ideal shear strength in covalent crystals

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

shear strength, normal stress, ab initio

Autoři

UMENO, Y.; ČERNÝ, M.

Rok RIV

2008

Vydáno

10. 3. 2008

Nakladatel

AMER PHYSICAL SOC

Místo

ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

ISSN

1098-0121

Periodikum

PHYSICAL REVIEW B

Ročník

77

Číslo

3

Stát

Spojené státy americké

Strany od

100101

Strany do

100101-4

Strany počet

4