SYMPOSIA PAPER Published: 01 January 1977
STP27995S

Load Interaction Effects on Fatigue Crack Growth in A514F Steel Alloy

Source

Variable-amplitude fatigue tests of A514F steel alloy were performed within a linear-elastic fracture mechanics framework in order to characterize the retardation response of a cyclic strain softening material. Results of single and multiple overload tests on A514F steel alloy suggested that a material's cyclic properties have little effect on the phenomenology of retardation behavior. For instance, single high load excursions (of different magnitudes and at different baseline ΔK levels) in this cyclic strain softening alloy caused fatigue crack growth rate retardation trends comparable to those exhibited by 2024-T3 aluminum, a cyclic strain hardening alloy. In addition, under complex loading conditions, the A514F steel alloy, like the 2024-T3 aluminum alloy, exhibited maximum interaction between single peak load excursions when two peak cycles were separated by a small distance.

Additional retardation caused by a greater number of overload cycles more than compensated for increased crack extension during the high load excursions. Electron fractographic results are presented and discussed in terms of the macroscopic crack growth rate findings.

Author Information

Mills, WJ
Hanford Engineering Development Laboratory, Westinghouse Hanford Company, Richland, Wash
Hertzberg, RW
Lehigh University, Bethlehem, Pa
Roberts, R
Lehigh University, Bethlehem, Pa
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Details
Developed by Committee: E08
Pages: 192–208
DOI: 10.1520/STP27995S
ISBN-EB: 978-0-8031-4709-6
ISBN-13: 978-0-8031-0319-1