Abstract
Ultrasonic fatigue experiments in the very high cycle fatigue (VHCF) regime are performed with spray-formed hypereutectic aluminium silicon alloy DISPAL® S232-T6x. DISPAL exhibits excellent mechanical properties with low weight and can achieve higher stiffness, greater high temperature strength, excellent wear resistance and a reduced coefficient of thermal expansion compared to cast or wrought aluminium alloys. T6x indicates peak ageing with improved ductility. In the present investigation specimens are cycled in resonance in constant (CA) and variable amplitude (VA) tests at ultrasonic frequency in the high cycle fatigue (HCF) and VHCF regime up to 2× 1010 cycles [1]. The cycling frequency of approximately 20 kHz allows accumulating fatigue data within reasonable testing times. Means of non-linear acoustics are employed for detecting early stages of fatigue damage and for monitoring vibration properties during fatigue life. Miner calculation and lifetime prediction is performed to describe mean VA lifetimes. Early failures caused by large materials defects are considered by using an adapted crack growth model.
Highlights
Ultrasonic fatigue experiments in the very high cycle fatigue (VHCF) regime are performed with spray-formed hypereutectic aluminium silicon alloy DISPAL® S232-T6x
It has been shown that for the spray-formed hypereutectic aluminium silicon alloy DISPAL® S232T6x second order harmonics and resonance frequency may be linked to progressing fatigue damage
It is concluded that fatigue lifetime of DISPAL® 232-T6x, even in the VHCF regime, is mainly determined by the number of cycles necessary to propagate cracks to rupture
Summary
Krug3 1Institute of Physics and Materials Science, BOKU, Austria 2PEAK Werkstoff GmbH, Germany 3Institute of Automotive Engineering, Cologne University of Applied Sciences, Germany
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
