Evaluation of Mean Stress Correction Approaches in High Cycle Fatigue Life Prediction of Titanium Alloy Considering Notch

Paper #:
  • 2014-01-0976

Published:
  • 2014-04-01
DOI:
  • 10.4271/2014-01-0976
Citation:
Soni, N., Bhise, O., and Nadkarni, M., "Evaluation of Mean Stress Correction Approaches in High Cycle Fatigue Life Prediction of Titanium Alloy Considering Notch," SAE Technical Paper 2014-01-0976, 2014, doi:10.4271/2014-01-0976.
Pages:
10
Abstract:
The effect of notches & mean stress in fatigue of materials has been a subject of wider interest. The current study is focused on alpha-beta Titanium alloy (Ti-6Al-4V) which is a common material in aerospace applications. Various mean stress correction approaches are evaluated for notched & un-notched specimens.Life predictions are obtained for a standard test specimen. For the zero mean condition, most approaches predict similar life. However for non-zero mean conditions, significant deviation is observed in life predictions for Titanium alloy (Ti-6Al-4V). Walker mean stress correction approach was found to be in close agreement with published test data. Walker constant is a significant parameter which influences life prediction accuracy. Study has been carried out to find suitable values of constant for different standard shapes/forms of raw material used for manufacturing.
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