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In the very high cycle fatigue regime high-frequency testing techniques are required. Using the ultrasonic fatigue technique, testing time could be reduced significantly in comparison to conventional servo-hydraulic machines. An ultrasonic fatigue testing system developed by the BOKU Vienna with load frequencies of about 20kHz is used for variable amplitude loading investigations in the VHCF regime...
Ultrasonic fatigue testing equipment is presented that is capable of performing constant amplitude (CA) and variable amplitude (VA) experiments at different constant load ratios. This equipment is used to study cyclic properties of aluminium alloy 2024-T351 in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regime at load ratios R=−1 and R=0.5. CA loading does not reveal a fatigue...
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