Abstract
The influence of consecutive dynamic and gigacycle fatigue loads on the lifetime of the aluminum alloys AlMg6 and D16T is studied to explore the morphology (roughness scaling) of the fracture surface and generalized fatigue crack kinetics taking into account the correlated behavior of defects at the crack tip area (process zone). The samples are preloaded dynamically by a split Hopkinson bar device. Fatigue tests of preloaded samples are conducted on a Shimadzu USF-2000 ultrasonic fatigue testing machine. A New-View 5010 interferometer-profiler of high structural resolution (0.1 nm) is used for quantitative fracture surface analysis, which provides the data allowing us to find correlation between the mechanical properties and scale-invariant characteristics of damage-induced roughness formed under dynamic and gigacycle fatigue loads.
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