SYMPOSIA PAPER Published: 01 January 1988
STP23275S

Fatigue Crack Growth at Root Radii in Sheets with Variable Thickness

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Fatigue crack growth data have been obtained for cracks at root radii in sheets with variable thickness. These test data were obtained under constant-amplitude as well as spectrum loading. Analytical stress-intensity factors were developed using mathematical techniques. The Mode I stress-intensity factors were approximately 10% lower than that of a plate with uniform thickness. Crack growth predictions for the test specimens were made using the analytical stress-intensity factors and a crack growth equation for a skin with uniform thickness. A good correlation is shown between observed and predicted crack growth behavior.

Author Information

Ratwani, MM
Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA
Kan, H-P
Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA
Hsu, SM
Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA
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Details
Developed by Committee: E08
Pages: 765–780
DOI: 10.1520/STP23275S
ISBN-EB: 978-0-8031-5036-2
ISBN-13: 978-0-8031-0949-0