An experimental approach to estimate damage and remaining life of metals under uniaxial fatigue loading |
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Affiliation: | 1. Laboratoire Brestois de Mécanique et des Systèmes (EA4325), ENSTA-Bretagne/Université de Brest/ENIB, 2 rue François Verny, F-29806 Brest Cedex 9, France;2. ArcelorMittal Maizières Research & Development, BP 30320, F-57283 Maizières-les-Metz Cedex, France;1. University of Hohenheim, Institute of Agricultural Engineering, Garbenstr. 9, D-70599, Stuttgart, Germany;2. University of California, Davis, Department of Biological and Agricultural Engineering, One Shields Ave., Davis, CA 95616, USA;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China;2. Aircraft Strength Research Institute, Xi’an 710065, China;3. Department of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract: | An experimental procedure to estimate damage evolution and remaining fatigue life of metals associated with fatigue loading is presented. Experimental phase involves uniaxial tension–compression fatigue tests performed with solid API 5L X52 and tubular carbon steel 1018 specimens subjected to both constant and variable amplitude loading. A correlation between the so-called damage parameter and the thermal response of a material at different damage levels is proposed. Results demonstrate that the correlation can estimate damage evolution with reasonable accuracy in both constant and variable amplitude fatigue processes. It is shown that under the conditions tested the evolution of damage parameter with respect to the normalized fatigue life is independent of the load amplitude, load ratio, loading sequence, material properties, and specimen geometry. The proposed correlation and the relationship between the damage parameter and the normalized fatigue life are employed to develop a non-destructive method to predict the remaining fatigue life of metallic specimens with prior fatigue damage. The method is applied to both constant and variable amplitude loading and the predicted results are found to be in good agreement with those obtained from the experiments. |
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Keywords: | Fatigue damage Damage parameter Constant amplitude loading Variable amplitude loading Remaining fatigue life |
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