SYMPOSIA PAPER Published: 01 January 1982
STP30098S

Effect of Residual Stresses on Fatigue Crack Growth Rates in Weldments of Aluminum Alloy 5456 Plate

Source

Rates of fatigue crack propagation were determined for CT specimens taken from the weld metal, heat-affected zone, and base metal of an Alcoa 649A Process 5556 butt weld in a 51-mm (2-in.)-thick 5456-H117 plate. Crack-opening displacement measurements were taken during the fatigue crack propagation tests so that the effects of crack-opening loads and residual stresses could be determined. The use of the concept of Elber's effective stress intensity range, based on the measurements of crack-opening loads, indicates that the crack propagation rates are equivalent in the weld metal, heat-affected zone, and base metal. Furthermore, the effect of stress ratio also can be correlated using the effective stress intensity range concept.

Author Information

Nordmark, GE
Alcoa Technical Center, Alcoa Center, Pa.
Mueller, LN
Alcoa Technical Center, Alcoa Center, Pa.
Kelsey, RA
Alcoa Technical Center, Alcoa Center, Pa.
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Details
Developed by Committee: E08
Pages: 44–62
DOI: 10.1520/STP30098S
ISBN-EB: 978-0-8031-4841-3
ISBN-13: 978-0-8031-0711-3