SEDL / STP / STP811-EB / STP30565S

Fatigue Crack Tip Strains in 7075-T6 Aluminum Alloy by Stereoimaging and Their Use in Crack Growth Models

Davidson, DL
Staff Scientist, Southwest Research Institute, San Antonio, Tex.

Lankford, J
Staff Scientist, Southwest Research Institute, San Antonio, Tex.

Pages: 29    Published: Jan 1983

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Abstract

Detailed quantitative measurements of crack tip strains have been made for near-threshold fatigue cracks in 7075-T6 aluminum specimens grown in a vacuum environment. In addition, crack tip opening displacements and crack growth rates have been measured. These data are used in three related models which examine cumulative and critical strain and critical energy dissipation as criteria for crack advance. These models are then examined in light of observed crack growth patterns.