Fatigue life prediction based on natural frequency changes for spot welds under random loading |
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| Authors: | Rui-Jie Wang De-Guang Shang |
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| Affiliation: | 1. Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province, Hunan University, Changsha, Hunan 410082, China;2. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, United States;3. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi''an, Shanxi 710129, China;1. Institute of Aircraft Propulsion Systems, University of Stuttgart, 70569 Stuttgart, Germany;2. Materials Testing Institute, University of Stuttgart, 70569 Stuttgart, Germany;1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China;2. School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China |
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| Abstract: | Fatigue tests were carried out on tensile-shear spot-welded specimens under random loading; at the same time, natural frequencies at different life stages were measured. Test results were compared with that under constant amplitude loading. The relationship between damage and natural frequency change ratio established under constant amplitude loading is here modified. The nonlinear damage evolution equation was established using the damage represented by frequency change for spot welds. The fatigue life of spot welds under random loading was predicted with this damage evolution relationship using the rainflow counting method results, as well as other life prediction methods with different counting methods. Comparison of life prediction results showed that the method using changes of natural frequency can be an on-line approach and the predicted lives have a good agreement with the experimental data. |
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