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《Journal of Beijing Polytechnic University》 2004-02
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Fatigue Damage Parameter of Spot-welded Joints Based on Dynamic Response Characteristics

SHANG De-guang ( College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100022, China )  
According to the different fatigue damage cumulative quantity, the dynamic response frequency is measured during the fatigue damage process. The results of experimental study show that the natural frequency varies nonlinearly with the fatigue damage fraction. A new fatigue damage parameter is proposed, which is described by the nonlinear relationship between the natural frequency of specimen and its cyclic ratio. On the basis of continuum fatigue damage theory, a nonlinear fatigue damage evolution model is developed. The results show that the proposed fatigue damage parameter can describe well the characteristics of fatigue damage. The predicted errors of fatigue life are within two factors.
【Fund】: 美国Alabama大学汽车研究中心基金资助项目(HPP-1602(526));; 北京市自然科学基金贤助项目(3042003).
【CateGory Index】: TG407
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