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  4. Fatigue strength improvement by ultrasonic impact treatment of highly stressed spokes of cast aluminium wheels
 
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2011
Journal Article
Title

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

Abstract
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.
Author(s)
Berg-Pollack, Antje
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Völlmecke, Franz Josef
Hallenberg-Hesborn
Sonsino, Cetin Morris  
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Journal
International journal of fatigue  
DOI
10.1016/j.ijfatigue.2010.09.017
Language
English
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Keyword(s)
  • fatigue strength

  • ultrasonic impact treatment

  • highly stressed spokes

  • cast aluminium wheel

  • fatigue strength

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