Fatigue strength improvement by ultrasonic impact treatment of highly stressed spokes of cast aluminium wheels

This paper reports on the application of the ultrasonic impact treatment on spokes of cast aluminium (AlSi11Mg) wheel spiders and its influence under spectrum loading. After preliminary investigations with specimens removed from the spokes for the adjustment of the treatment parameters, fatigue test...

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Bibliographic Details
Published in:International journal of fatigue 2011-04, Vol.33 (4), p.513-518
Main Authors: Berg-Pollack, A., Voellmecke, F.-J., Sonsino, C.M.
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Applied sciences
Cast aluminium
Compressive properties
Constant and variable amplitude loading
Durability
Exact sciences and technology
Fatigue
Fatigue strength
Lightweight design
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Residual stress
Spokes
Ultrasonic impact treatment
Wheels
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Summary:This paper reports on the application of the ultrasonic impact treatment on spokes of cast aluminium (AlSi11Mg) wheel spiders and its influence under spectrum loading. After preliminary investigations with specimens removed from the spokes for the adjustment of the treatment parameters, fatigue tests, measurement of residual stresses and metallographic analyses of untreated and treated spokes were performed. The mechanical impacts of the UIT effected a significant change of the microstructure, porosity and hardness. The application of the ultrasonic impact treatment introduced plastic deformations and consequently compressive residual stresses at the surface. The fatigue strength increased significantly compared to the untreated spokes under constant and variable amplitude bending loading. The UIT-technology promises a high potential for improving of the structural durability and safety and the saving of material in the production of cast aluminium wheels.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2010.09.017