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The paper describes how the achievement of product reliability depends upon an understanding and the determination of the extent of the scatter in fatigue life. By working in the short-life region of the S-N diagram it is possible to develop a pragmatic approach which has demonstrably been of great value in the case of gas turbine engines. The dangerous fallacy of depending upon the static proof test is emphasized.
life testing, fatigue (materials), reliability, performance
Company quality and reliability engineer, Rolls-Royce Ltd., Derby,