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PARABOLIC CURVED CRACK FRONTS IN FRACTURE TOUGHNESS SPECIMENS OF PARTICULATE REINFORCED ALUMINIUM ALLOY METAL MATRIX COMPOSITES
Author(s) -
Roebuck B.
Publication year - 1992
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1992.tb00012.x
Subject(s) - materials science , composite material , fracture toughness , aluminium , curvature , residual stress , toughness , alloy , aluminium alloy , geometry , mathematics
Crack front shapes in relatively thick fracture toughness specimens of Sic particulate reinforced metal matrix composites have been analysed. They were found to have a common shape, that of a parabola. This shape is thought to arise as a result of a distribution of residual stress across the test‐piece. A simple analysis is used to derive an expression for an effective crack length which can be used to calculate K IC values in specimens in which the crack fronts are excessively curved and do not meet relevant criteria for curvature in current standards for toughness testing of metallic materials.