On notch-strengthening and crack tip deformation in cellular metals

Using an image analysis technique, the deformation field in double-edged cracked specimens of an open-cell aluminum foam has been measured. The measured deformation field is consistent with a simple model in which failure occurs by tensile yield of the uncracked ligament and localized shearing (over...

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Bibliographic Details
Published in:Materials letters 2002-12, Vol.57 (3), p.532-536
Main Authors: Andrews, E.W, Gibson, L.J
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Foams
Fracture
Image analysis
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of solids
Metals. Metallurgy
Physics
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Summary:Using an image analysis technique, the deformation field in double-edged cracked specimens of an open-cell aluminum foam has been measured. The measured deformation field is consistent with a simple model in which failure occurs by tensile yield of the uncracked ligament and localized shearing (over a distance of about one cell) at the crack tip. An expression for notch strengthening based on this model provides good agreement with experimentally observed notch-strengthening results for both open- and closed-cell foams.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(02)00824-8