Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (4): 118-123,130.doi: 10.3969/j.issn.1000-565X.2014.04.018

• Mechanical Engineering • Previous Articles     Next Articles

Fatigue Life Prediction of Crane Based on Equivalent Initial Flaw Size and Power Spectral Density

Lu Nian- li Zhan Wei- gang   

  1. School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China
  • Received:2013-12-17 Revised:2014-01-14 Online:2014-04-25 Published:2014-03-03
  • Contact: 詹伟刚(1985-)，男，博士生，主要从事工程机械结构强度和疲劳研究． E-mail:zhanweigang@163.com
  • About author:陆念力(1955-)，男，教授，博士生导师，主要从事工程机械结构刚度、强度、稳定性、可靠性分析和故障诊断研究.E-mail:n．lu@hit．edu．cn
  • Supported by:

    国家 “十二五” 科技支撑计划项目(2011BAJ02B01)

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Abstract:

Proposed in this paper is a method to calculate the equivalent initial flaw size (EIFS) and its statisticaldistribution for crane's metal structure.The method,which is based on the Kitagawa- Takahashi diagram,uses fatiguelimit and fatigue crack growth threshold to calculate the EIFS,without the participation of randomly applied loads.Moreover,considering the effects of load sequence and crack closure on the predicted fatigue life,a frequency- do-main analysis method for crane fatigue life prediction is proposed based on the power spectral density of the load.Thefatigue life of crane box girder predicted by the proposed method is compared with the test ones presented in litera-tures,and a good consistency is revealed,which means that the proposed prediction method is applicable and reliable.

Key words: crane, fatigue life prediction, initial crack length, power spectral density, crack growth

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