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Gewählte Publikation:

Tschegg, S., Mayer, H..
(2001): Fatigue and fatigue crack growth of aluminium alloys at very high numbers of cycles.
Int. J. Fatigue, 23, 231-237

The application of ultrasonic frequency (20 kHz) loading to test fatigue and fracture mechanical properties of materials is briefly reviewed and recent investigations on high strength aluminium alloys are reported. Very high cycle endurance tests and near threshold crack growth experiments were performed with the 2024-T351 aluminium alloy. Lifetimes are approximately 10-100 times lower, if cycled in distilled water instead of ambient air. Fatigue experiments under randomly varying loads showed that linear damage summation calculations overestimated lifetimes by approximately a factor 2. Fracture mechanics studies in ambient air, dry air and in vacuum served to investigate the role of air humidity on near threshold fatigue crack growth at ultrasonic frequency. The threshold value was 2.1 MParootm in ambient air and 3.3 Warootm in vacuum. The aluminium alloy AlZnMgCu1.5-T66 and the aluminiumoxyde particle reinforced alloy 6061-T6 were tested at 100 Hz and 20 kHz to investigate frequency influences on high cycle fatigue properties, and similar lifetimes were found at both frequencies. (C) 2001 Elsevier Science Ltd. All rights reserved.
Autor*innen der BOKU Wien:
Mayer Herwig
Tschegg Stefanie

Find related publications in this database (Keywords)
ultrasonic fatigue
very high cycle fatigue
aluminium alloys
environmental influence
random amplitude loading
frequency influence

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