Numerical simulation of fatigue crack propagation under superimposed stress histories containing different frequency components with several mean stress conditions |
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| Affiliation: | 1. Department of Civil and Structural Engineering, Kyushu University, Japan;2. Department of Marine Systems Engineering, Kyushu University, Japan;1. Department of Naval Architecture and Ocean Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang, China;2. Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China;3. Ocean Engineering Program, COPPE, Federal University of Rio de Janeiro, 21945-970, Brazil;4. Offshore Oil, Gas Research Center, China University of Petroleum, Beijing 102249, China;1. Department of Structural and Geotechnical Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;2. Department of Naval Arch. and Ocean Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;1. Department of Mechanics and Engineering Science, Fudan University, Shanghai, China;2. Offshore Oil & Gas Research Center, China University of Petroleum, Beijing, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Marine Science and Technology, Newcastle University, NE1 7RU, England, UK |
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| Abstract: | Fatigue crack propagation behavior under superimposed stress histories containing different frequency components with several mean stress conditions was investigated. Numerical simulation of fatigue crack propagation based on an advanced fracture mechanics approach using the RPG (Re-tensile Plastic zone Generating) stress criterion for fatigue crack propagation was improved to extract the effective part from the applied stress history for fatigue crack propagation. The parameter, which is based on the plastic hysteresis energy consumed in the vicinity of a crack tip, was applied and implemented into the numerical simulation code of fatigue crack propagation. Fatigue crack propagation tests under various superimposed stress conditions with several mean stress conditions were performed and compared with the fatigue crack propagation histories obtained from the improved numerical simulations. These comparisons show the validity of the proposed procedure for extracting the effective stress history from the superimposed stress histories with different frequency components and mean stresses. Additionally, practical fatigue strength evaluations based on the linear cumulative fatigue damage parameter were conducted to investigate the tendency of the fatigue damage value under these stress conditions. |
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| Keywords: | Fatigue Superimposed stress history Numerical simulation of fatigue crack propagation |
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