Effect of Overloads on Fatigue of Shot Peened 2024 Al

Author:  Supik and Wagner
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002054
Year of Publication:  2002
Authors Vladimir Supik and Lothar Wagner Chair of Physical Metallurgy and Materials Technology, Technical University of Brandenburg at Cottbus, Cottbus, Germany Introduction Numerous investigations in the past have shown that shot peening can improve the fatigue performance of structural materials such as steels and aluminum alloys [1-4]. However, this beneficial effect of shot peening is usually demonstrated in constant amplitude tests although components in service hardly see simple constant load amplitudes [5]. Only a limited number of studies on shot peened components has been performed under variable amplitude loading [6]. Since shot peening-induced residual compressive stresses which are known to be the main reason for the improvement of the fatigue performance may not be cyclically stable if overloads of sufficient magnitude occur in service, it is interesting to know to what extent shot peening is still beneficial if variable amplitudes are applied.

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