Lifing predictions for Nickel based superalloys exhibiting sustained macroscopic deflected fatigue crack
Lifing predictions for Nickel based superalloys exhibiting sustained macroscopic deflected fatigue crack
Sustained macroscopic deflected fatigue crack growth has been observed under mode I loading in cast and wrought nickel based superalloy, Udimet 720Li, which is typically used in aeroengine turbine disc applications. In a fatigue test with a corner notched specimen a crack is usually expected to grow in a quarter-circular plane perpendicular to the tensile stress axis, the sustained deflected crack growth we report however exhibits considerable deflection from this plane, which is initiated from the free surfaces when tested at 300°C in air. It is necessary to develop an understanding of the mechanism and develop assessment methodologies for lifing of the turbine bore region, to be able to predict both crack path and crack growth rates when such anomalous crack growth behaviour may occur. The work reported here focuses on the development of lifing approaches required to describe the previously reported phenomena.
Schoettle, C
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Reed, P.A.S.
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Sinclair, I.
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Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Schoettle, C
632eb1af-6995-4c7c-9085-fd771638163f
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Schoettle, C, Reed, P.A.S., Sinclair, I. and Starink, M.J.
(2011)
Lifing predictions for Nickel based superalloys exhibiting sustained macroscopic deflected fatigue crack.
8th International Charles Parsons Turbine Conference, Portsmouth, United Kingdom.
04 - 07 Sep 2011.
6 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Sustained macroscopic deflected fatigue crack growth has been observed under mode I loading in cast and wrought nickel based superalloy, Udimet 720Li, which is typically used in aeroengine turbine disc applications. In a fatigue test with a corner notched specimen a crack is usually expected to grow in a quarter-circular plane perpendicular to the tensile stress axis, the sustained deflected crack growth we report however exhibits considerable deflection from this plane, which is initiated from the free surfaces when tested at 300°C in air. It is necessary to develop an understanding of the mechanism and develop assessment methodologies for lifing of the turbine bore region, to be able to predict both crack path and crack growth rates when such anomalous crack growth behaviour may occur. The work reported here focuses on the development of lifing approaches required to describe the previously reported phenomena.
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e-pub ahead of print date: September 2011
Venue - Dates:
8th International Charles Parsons Turbine Conference, Portsmouth, United Kingdom, 2011-09-04 - 2011-09-07
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 372229
URI: http://eprints.soton.ac.uk/id/eprint/372229
PURE UUID: fc1872fc-e404-4885-9233-f55d7d316853
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Date deposited: 04 Dec 2014 13:36
Last modified: 12 Dec 2021 02:47
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Author:
C Schoettle
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