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Journal of Materials Science

, Volume 42, Issue 12, pp 4308–4315 | Cite as

Influence of pad span on fretting fatigue behaviour of AISI 304 stainless steel

  • M. Jayaprakash
  • S. Ganesh Sundara RamanEmail author
Article

Abstract

The present work deals with the influence of pad span on fretting fatigue behaviour of AISI 304 stainless steel. Relative slip is one of the three primary variables influencing fretting fatigue behaviour. The relative slip can be modified by changing the pad span and/or cyclic stress. In the present study, the effect of relative slip was studied at different cyclic stress levels and by using fretting pads with three different pad span values (15, 20 and 30 mm). The relative slip increased with an increase in pad span and cyclic stress. Samples tested with fretting pads having longer pad span (30 mm) exhibited longer lives. Though the specimens tested with pads having longer pad span experienced higher frictional stress and tangential force coefficient compared with those tested with pads having smaller pad span (15 or 20 mm), the relative slip values were larger in the former. Due to larger relative slip values it was assumed that small cracks initiated by fretting fatigue would have been worn away due to wear damage. Due to this the specimens tested with pads having longer pad span exhibited enhanced fretting fatigue lives. More deformation-induced martensite formed in the samples tested with pads having longer pad span owing to longer lives.

Keywords

Fatigue Martensite Cyclic Stress Frictional Stress Relative Slip 

Notes

Acknowledgement

This work was supported by the Department of Science and Technology, Government of India under SERC Fast Track Scheme 2001–2002 (project number SR/FTP/ET-183/2001).

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringIndian Institute of Technology MadrasChennaiIndia

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