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Assessment of Thermal Fatigue Resistance of High Temperature Alloys

Published online by Cambridge University Press:  04 July 2016

J. F. Barnes  and
C. P. Tilly
J. F. Barnes
Affiliation:
National Gas Turbine Establishment
C. P. Tilly
Affiliation:
National Gas Turbine Establishment
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Extract

This note is concerned with the significance of a “hold period” on thermal fatigue endurances and on the use of a frequency exponent to correlate the results of mechanical fatigue tests at various temperatures.

In their note in the January 1965 Journal (pp. 53-55), Coles and Skinner quite rightly pointed out that residual stresses, set up as the result of plastic yielding in compression during an initial heating period, will undergo redistribution during a subsequent “hold period” at an elevated steady temperature. However, it is important to note that the redistributed stress pattern and the associated creep strains at the conclusion of the “hold period” will depend very much on the nature of the applied loading. For example, the compressive strain and the associated tensile stress set up in the rim of the disc will both fall in magnitude if the disc is not rotating and may reach infinitesimal values if the “hold period” is long enough.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 69 , Issue 653 , May 1965 , pp. 343 - 344
Copyright
Copyright © Royal Aeronautical Society 1965

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References

1.Coles, A. and Skinner, D.Assessment of Thermal-Fatigue Resistance of High Temperature Alloys. Journal of the Royal Aeronautical Society, January 1965.Google Scholar
2.Glenny, E. and Taylor, T. A.A Study of the Thermal Fatigue Behaviour of Metals. J. Inst. Metals, Vol. 88, No. 11, p 449, 1959.Google Scholar
3.Tilly, G. P. Effects of Varied Loading Paths on Fatigue Endurances. Part I. Some Load Fatigue Properties of Nimonic 90 at Elevated Temperatures. ARC Current Paper CP 786.Google Scholar
4.Eckel, J. F.The Influence of Frequency on the Repeated Bending Life of Acid Lead. Proc. ASTM, Vol. 51, p 745, 1951.Google Scholar
5.Tilly, G. P. Unpublished work at NGTE.Google Scholar