Fatigue Life Prediction of Bridge Crane Wire Rope Based on Local Stress-strain Method
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摘要: 为保证桥式起重机的提升作业安全性,以32t×42 m双梁桥式起重机用钢丝绳为研究对象,采用局部应力应变法估算其承载从自由状态到额定载荷的两个载荷步时的疲劳寿命。通过有限元数值算法得到钢丝绳的应力分布,由此确定可能发生疲劳破坏的危险部位在钢丝绳与绳芯接触处,应力大小为1 060.3 MPa,寿命为7 233.6次。根据Manson-Coffin公式,通过平均应力修正,得到基于局部应力应变法的疲劳寿命计算模型,计算得到疲劳寿命为7 937.4次,与有限元数值算法得到的寿命相差8.87%,阐明了局部应力应变法估算钢丝绳疲劳寿命的可行性。Abstract: To ensure the safety and reliability of 32t×42m double girder overhead crane, the local stress-strain method is adopted to estimate the fatigue life of the wire rope when bearing from the free state to the rated load. Finite element numerical algorithms are utilized to obtain the stress distribution of the wire rope, and the dangerous parts of the wire rope fatigue failure are located at the contact zone of the wire rope and the cord. The simulation value of the wire rope stress and the life are 1 060.3 MPa and 7 233.6 lifting times respectively. In order to prove above results, the calculation model of the wire rope life is established according to Manson-Coffin equation when the mean stress is considered. The fatigue life is 7 937.4 lifting times. The deviation between the numerical life value and the calculation model is 8.87%. Therefore, the calculation model is indicated suitable for predicting the wire rope fatigue life in the practical application.
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[1] 尚永春,姚宗州.浅谈弯曲疲劳对钢丝绳寿命的影响[J].海洋技术,1996,15(1):68-70 Shang Y C, Yao Z Z. The influence of the bending fatigue on the life of wire rope[J]. Ocean Technology,1996,15(1):68-70 (in Chinese) [2] 中钢集团武汉安全环保研究院有限公司.一种基于起重机用钢丝绳载荷测量的在线检测使用强度和疲劳预报的装置及方法[P].中国专利:102445396,2012-5-9 Sinosteel corporation wuhan safety & environmental protection research institute. an apparatus and method for using the strength and fatigue prediction based online testing crane wire rope load measurement[P]. 102445396,2012-5-9 (in Chinese) [3] 尚德广,王大康,李明,等.随机疲劳寿命预测的局部应力应变场强法[J].机械工程学报,2002,38(1):67-70 Shang D G, Wang D K, Li M, et al. Method of local stress-strain field intensity for random fatigue life prediction[J]. Chinese Journal of Mechanical Engineering,2002,38(1):67-70 (in Chinese) [4] Zhang C C, Yao W X, Ye B. Equivalent stress severity factor approach for fatigue of multi-fastener plate[J]. Acta Aeronauticaet Astronautica Sinica,2009,30(2):271-275 [5] 郭建生,孙国正.用断裂力学法估算焊接钢结构的疲劳寿命[J].起重运输机械,1999,(10):9-12 Guo J S, Sun G Z. Estimate the fatigue life of welded steel with fracture mechanics method[J]. Hoisting and Conveying Machinery,1999(10):9-12 (in Chinese) [6] 姚卫星.结构疲劳寿命分析[M].北京:国防工业出版社,2003 Yao W X. Fatigue life prediction of structures[M]. Beijing: National Defense Industry Press,2003 (in Chinese)
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