Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals

Pedro Peralta; U. Ramamurty; S. Suresh; G. H. Campbell; W. E. King; T. E. Mitchell

doi:10.1016/S0921-5093(00)01939-0

Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals

Pedro Peralta, U. Ramamurty, S. Suresh, G. H. Campbell, W. E. King, T. E. Mitchell

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Interfacial fatigue cracks were propagated in Cu/sapphire bicrystals with effect of anisotropy and slip geometry in the fracture process. Compact tension specimens with two different crystallographic crack growth directions were loaded to ΔK_la ≃ 2 Mpa m^1/2 with R*0. Interfacial cracks grew preferentially along <110>_Cu and less favorably along <001>_Cu. Large areas of the copper fracture surface were relatively featureless for crack growth along <110>_Cu, whereas well defined striations could be observed for the second direction. A refined elastic analysis of the anisotropic near-tip fields for the interfacial crack revealed that the preferential crack growth direction had the highest energy release rate and mode I crack tip opening displacement. The second direction corresponded to a minimum mode II mix. Similar correlations were found in other Cu/sapphire bicrystal experiments described in the literature. Dislocation nucleation from the interfacial crack tip is also analyzed.

Original language	English (US)
Pages (from-to)	55-66
Number of pages	12
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	314
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(00)01939-0
State	Published - Sep 15 2001

Keywords

Anisotropy
Compact tension
Cu/sapphire bicrystal
Interfacial crack

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals",

abstract = "Interfacial fatigue cracks were propagated in Cu/sapphire bicrystals with effect of anisotropy and slip geometry in the fracture process. Compact tension specimens with two different crystallographic crack growth directions were loaded to ΔKla ≃ 2 Mpa m1/2 with R*0. Interfacial cracks grew preferentially along <110>Cu and less favorably along <001>Cu. Large areas of the copper fracture surface were relatively featureless for crack growth along <110>Cu, whereas well defined striations could be observed for the second direction. A refined elastic analysis of the anisotropic near-tip fields for the interfacial crack revealed that the preferential crack growth direction had the highest energy release rate and mode I crack tip opening displacement. The second direction corresponded to a minimum mode II mix. Similar correlations were found in other Cu/sapphire bicrystal experiments described in the literature. Dislocation nucleation from the interfacial crack tip is also analyzed.",

keywords = "Anisotropy, Compact tension, Cu/sapphire bicrystal, Interfacial crack",

author = "Pedro Peralta and U. Ramamurty and S. Suresh and Campbell, {G. H.} and King, {W. E.} and Mitchell, {T. E.}",

note = "Funding Information: This research was supported by the Department of Energy (OBES), a Faculty Grant in Aid from Arizona State University and by the National Science Foundation, under grant no. DMR-9984633.",

year = "2001",

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doi = "10.1016/S0921-5093(00)01939-0",

language = "English (US)",

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T1 - Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals

AU - Peralta, Pedro

AU - Ramamurty, U.

AU - Suresh, S.

AU - Campbell, G. H.

AU - King, W. E.

AU - Mitchell, T. E.

N1 - Funding Information: This research was supported by the Department of Energy (OBES), a Faculty Grant in Aid from Arizona State University and by the National Science Foundation, under grant no. DMR-9984633.

PY - 2001/9/15

Y1 - 2001/9/15

N2 - Interfacial fatigue cracks were propagated in Cu/sapphire bicrystals with effect of anisotropy and slip geometry in the fracture process. Compact tension specimens with two different crystallographic crack growth directions were loaded to ΔKla ≃ 2 Mpa m1/2 with R*0. Interfacial cracks grew preferentially along <110>Cu and less favorably along <001>Cu. Large areas of the copper fracture surface were relatively featureless for crack growth along <110>Cu, whereas well defined striations could be observed for the second direction. A refined elastic analysis of the anisotropic near-tip fields for the interfacial crack revealed that the preferential crack growth direction had the highest energy release rate and mode I crack tip opening displacement. The second direction corresponded to a minimum mode II mix. Similar correlations were found in other Cu/sapphire bicrystal experiments described in the literature. Dislocation nucleation from the interfacial crack tip is also analyzed.

AB - Interfacial fatigue cracks were propagated in Cu/sapphire bicrystals with effect of anisotropy and slip geometry in the fracture process. Compact tension specimens with two different crystallographic crack growth directions were loaded to ΔKla ≃ 2 Mpa m1/2 with R*0. Interfacial cracks grew preferentially along <110>Cu and less favorably along <001>Cu. Large areas of the copper fracture surface were relatively featureless for crack growth along <110>Cu, whereas well defined striations could be observed for the second direction. A refined elastic analysis of the anisotropic near-tip fields for the interfacial crack revealed that the preferential crack growth direction had the highest energy release rate and mode I crack tip opening displacement. The second direction corresponded to a minimum mode II mix. Similar correlations were found in other Cu/sapphire bicrystal experiments described in the literature. Dislocation nucleation from the interfacial crack tip is also analyzed.

KW - Anisotropy

KW - Compact tension

KW - Cu/sapphire bicrystal

KW - Interfacial crack

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Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals

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Keywords

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