Prediction of fatigue crack propagation life in notched members under variable amplitude loading |
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Authors: | Z Khan A Rauf M Younas |
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Affiliation: | (1) Mechanical Engineering Department, King Fahd University of Petrolium and Minerals, Dhahran, Saudi Arabia |
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Abstract: | One of the interesting phenomenon in the study of fatigue crack propagation under variable amplitude load cycling is the crack
growth retardation that normally occurs due to the application of a periodic overload. Fatigue crack growth rate under simple
variable amplitude loading sequence incorporating period overloads is studied using single edge notched specimens of AISI304
stainless steel. Load interaction effects due to single and multiple overload have been addressed. Substantial retardation
of fatigue crack growth rate is observed due to the introduction of periodic tensile overloads. Estimates of fatigue life
have been obtained employing Wheeler model (using Paris and modified Paris equations) and Elber’s model. Analytical predictions
are compared with experimental results. Results of these analytical fatigue life predictions show good agreement with the
experimental fatigue life data. Fatigue crack propagation rates also have been evaluated from the fractographic study of fatigue
striations seen on the fracture surface. Good agreement was found between the experimentally observed crack growth rates and
the fatigue crack growth rates determined by the fractographic studies. |
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Keywords: | crack propagation life prediction notched member variable amplitude |
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