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This paper illustrates the substantial fatigue life improvements that have been achieved with 7050 heavy gauge plate over the past two decades. The load control fatigue resistance of 7050-T7451 thick plate is shown to decrease with increasing plate thickness at both the plate quarter-thickness (T/4) and mid-thickness (T/2). These reductions in fatigue resistance are shown to be most substantial at the plate mid-thickness, and they are shown to be directly related to the maximum size of remaining micropores.
7050-T7451, aluminum plate, MIL-HDBK-5, load control fatigue properties, microporosity, equivalent stress, thickness effects, process optimization, lognormal distribution
Rolled Products Technical Manager, Century Aluminum Corporation, Ravenswood, West Virginia
Manager, Structural Integrity Projects Office, Advanced Manufacturing Technology, Battelle, Columbus, Ohio