Influence of the level of damage on the high temperature fatigue life of an aircraft turbine disc

E. Silveira; G. Atxaga; A. M. Irisarri

doi:10.1016/j.engfailanal.2008.02.012

Influence of the level of damage on the high temperature fatigue life of an aircraft turbine disc

E. Silveira, G. Atxaga, A. M. Irisarri

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

This paper analyses the effect induced by those scratches produced during the handling and mounting of an aircraft turbine disc on their fatigue life. Fatigue tests were performed at 300 and 600 °C on specimens without and with various levels of damage. At 600 °C, an inverse relationship between the depth of the scratches and the fatigue life was found. However, at 300 °C no effect of these scratches on fatigue life was detected, obtaining very similar results in all of them. Examination of the failed specimens revealed that failure originated away from the scratch. Measurement of residual stresses helps to find an explanation to this apparently anomalous behaviour. It was observed that machining of the specimens induced high tensile residual stresses. At 600 °C, these stresses are relieved and failure at the scratched zone is promoted.

Original language	English
Pages (from-to)	578-584
Number of pages	7
Journal	Engineering Failure Analysis
Volume	16
Issue number	2
DOIs	https://doi.org/10.1016/j.engfailanal.2008.02.012
Publication status	Published - Mar 2009

Keywords

Fatigue life
Level of damage
Nickel base alloy
Turbine discs

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10.1016/j.engfailanal.2008.02.012

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abstract = "This paper analyses the effect induced by those scratches produced during the handling and mounting of an aircraft turbine disc on their fatigue life. Fatigue tests were performed at 300 and 600 °C on specimens without and with various levels of damage. At 600 °C, an inverse relationship between the depth of the scratches and the fatigue life was found. However, at 300 °C no effect of these scratches on fatigue life was detected, obtaining very similar results in all of them. Examination of the failed specimens revealed that failure originated away from the scratch. Measurement of residual stresses helps to find an explanation to this apparently anomalous behaviour. It was observed that machining of the specimens induced high tensile residual stresses. At 600 °C, these stresses are relieved and failure at the scratched zone is promoted.",

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AU - Atxaga, G.

AU - Irisarri, A. M.

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N2 - This paper analyses the effect induced by those scratches produced during the handling and mounting of an aircraft turbine disc on their fatigue life. Fatigue tests were performed at 300 and 600 °C on specimens without and with various levels of damage. At 600 °C, an inverse relationship between the depth of the scratches and the fatigue life was found. However, at 300 °C no effect of these scratches on fatigue life was detected, obtaining very similar results in all of them. Examination of the failed specimens revealed that failure originated away from the scratch. Measurement of residual stresses helps to find an explanation to this apparently anomalous behaviour. It was observed that machining of the specimens induced high tensile residual stresses. At 600 °C, these stresses are relieved and failure at the scratched zone is promoted.

AB - This paper analyses the effect induced by those scratches produced during the handling and mounting of an aircraft turbine disc on their fatigue life. Fatigue tests were performed at 300 and 600 °C on specimens without and with various levels of damage. At 600 °C, an inverse relationship between the depth of the scratches and the fatigue life was found. However, at 300 °C no effect of these scratches on fatigue life was detected, obtaining very similar results in all of them. Examination of the failed specimens revealed that failure originated away from the scratch. Measurement of residual stresses helps to find an explanation to this apparently anomalous behaviour. It was observed that machining of the specimens induced high tensile residual stresses. At 600 °C, these stresses are relieved and failure at the scratched zone is promoted.

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KW - Level of damage

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Influence of the level of damage on the high temperature fatigue life of an aircraft turbine disc

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Keywords

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