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A study of the effect of subcritical crack growth on the geometry dependence on nonlinear fracture toughness parametersThe effect of subcritical crack growth on the geometry dependence of nonlinear fracture toughness parameters was studied by comparing the toughness values for different specimen geometries at the onset of subcritical crack growth and at the initiation of unstable crack propagation. Center-cracked thin sheet specimens of 2024-T3 and 7075-T6 aluminum alloys were tested by varying the specimen length L, width w, and crack length-to-width ratio c/w. When the onset of unstable crack propagation was selected as the critical point, the nonlinear energy toughness and the R curve toughness increased with increasing w and decreasing L and c/w. However, when the onset of subcritical crack growth was taken as the critical point, energy toughness and the linear toughness values were independent of these geometrical variables.
Document ID
19770003312
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jones, D. L.
(George Washington Univ. Washington, DC, United States)
Poulose, P. K.
(George Washington Univ. Washington, DC, United States)
Liebowitz, H.
(George Washington Univ. Washington, DC, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Publication Information
Publication: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1
Subject Category
Structural Mechanics
Accession Number
77N10254
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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