Journal Published Online: 01 April 2008
Volume 5, Issue 4

Fretting Fatigue Behavior of Shot-Peened Ti-6Al-4V and IN100

CODEN: JAIOAD

Abstract

Shot-peened titanium alloy Ti-6Al-4V and nickel-based super alloy IN100 were subjected to plain and fretting fatigue under cylinder-on-flat contact condition at room temperature. Measurement of compressive residual surface stress from shot-peening before and after fretting showed relaxation, which was significant in IN100 and near the contact surface. The fretting fatigue life of IN100 did not improve significantly due to shot-peening, while there was considerable improvement for Ti-6Al-4V and relatively less relaxation of the residual surface stress. Further, fretting had a relatively more detrimental effect on the fatigue performance of Ti-6Al-4V than in the case of IN100. A critical plane-based fatigue crack initiation model, a modified shear stress range parameter, was computed from finite element analysis for two levels of residual surface stress relaxation: no relaxation and complete relaxation. This analysis suggested that not only crack initiation but also propagation should be considered to characterize fretting fatigue behavior of shot-peened specimens; however, it showed an appropriate trend with the measured fretting fatigue life and agreement with several other experimental observations.

Author Information

Mall, Shankar
Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH
Ng, J.
Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH
Madhi, E.
Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH
Pages: 12
Price: $25.00
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Details
Stock #: JAI101587
ISSN: 1546-962X
DOI: 10.1520/JAI101587