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|Title:||New methodology of fatigue life evaluation for multiaxially loaded notched components based on two uniaxial strain-controlled tests|
|Citation:||International Journal of Fatigue, 2018; 111:308-320|
|Ricardo Branco, P. A. Prates, J. D. Costa, Filippo Berto, Andrei Kotousov|
|Abstract:||The present paper focuses on the application of the total strain energy density approach to assess fatigue life in notched samples subjected to multiaxial loading. This approach requires, as a starting point, a fatigue master curve defined in terms of total strain energy density versus number of cycles to failure, which is usually determined from a set of uniaxial fatigue tests using smooth standard specimens. In order to reduce the time and cost associated with the generation of the fatigue master curve, a straightforward methodology based on the outcomes of only two uniaxial strain-controlled tests is proposed. The methodology is applied to round bars with U-shaped notches subjected to proportional bending-torsion loading histories. A very good correlation between the experimental and the predicted life of the notched specimens is observed. In addition, the theoretical predictions are nearly independent of the pairs of uniaxial strain-controlled tests selected to obtain the fatigue master curve, which indicates a good robustness of the suggested methodology.|
|Keywords:||Strain energy density; multiaxial loading; fatigue life prediction Notch effect; notched round bars; pseudo-elastic stresses|
|Rights:||© 2018 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Civil and Environmental Engineering publications|
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