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Influence of Foreign Object Damage on High Cycle Fatigue of Ti–6Al–4V Alloy

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Abstract

The influence of foreign object damage (FOD) on high cycle fatigue (HCF) of Ti–6Al–4V alloy has been investigated. FOD was induced by shooting 3.2 mm diameter steel spheres at a velocity of 300 m/s on the centre of flat plate specimens using a compressed air gun facility. Both normal and 60° angular impacts were carried out. In order to assess debit in the fatigue strength due to notch effect, machined notches of the same notch profile (radii and depth dimensions) as those observed in high velocity impact were also tested. The tests were conducted at room temperature and at two R ratios of 0.1 and 0.5. Fatigue life was found to be reduced in FOD impacted samples and the debit in fatigue life was much larger than that for machined notch specimens. This might be attributed to the effect of residual stresses. Further, the role of residual stresses were also brought out by comparing results of HCF tests at R = 0.1 and R = 0.5. As expected, a larger debit in fatigue life was found to occur at low R values where residual stresses were not expected to be relaxed. No significant differences in fatigue life between the normal and angular impacted samples was noticed. Optical and SEM investigations were carried out to examine the shape of the indents and micro-structural features.

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Acknowledgments

The authors gratefully acknowledge the encouragement and support provided by Director, Dr. C. P. Ramanarayanan, Director of Gas Turbine Research Establishment, Bangalore, Shri. S. P. Suresh Kumar, Associate Director and Shri. B. V. A. Patnaik, Technical Director.

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Authors and Affiliations

  1. Gas Turbine Research Establishment, C. V. Raman Nagar, Bangalore, 560093, India

    Anuradha Nayak Majila, S. Ramachandra, S. L. Mannan, D. Chandru Fernando & S. N. Narendrababu

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  1. Anuradha Nayak Majila
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  2. S. Ramachandra
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  3. S. L. Mannan
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  4. D. Chandru Fernando
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  5. S. N. Narendrababu
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Correspondence to Anuradha Nayak Majila.

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Nayak Majila, A., Ramachandra, S., Mannan, S.L. et al. Influence of Foreign Object Damage on High Cycle Fatigue of Ti–6Al–4V Alloy. Trans Indian Inst Met 69, 1475–1481 (2016). https://doi.org/10.1007/s12666-015-0715-5

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  • DOI: https://doi.org/10.1007/s12666-015-0715-5

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