Abstract
In this study, the application of cumulative damage rule under variable amplitude stressing in very high cycle fatigue regime was investigated. Ultrasonic fatigue tests were conducted using Ti-6Al-4V alloy under constant amplitude loading and variable amplitude loading. Under constant amplitude loading, both internal fatigue failure and surface failure are observed. Under variable amplitude containing LCF and HCF loading with surface origin and VHCF loading with internal origin, the application of cumulative damage rule was not confirmed. Additional test results to confirm the application and study of fracture mechanism under variable amplitude stressing in the very high cycle fatigue regime are needed.
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