焊接结构件疲劳裂纹扩展的数值研究

摘要: 针对焊接结构件中出现地裂纹现象，建立塔式起重机起重臂有限元模型。采用有限元数值模拟，同时考虑残余应力的影响，计算QTZ40塔机起重臂下弦杆与水平腹杆焊接处在变幅小车满载和空载状态下，不同长度裂纹对应的应力强度因子，建立裂纹应力强度因子幅与裂纹长度的函数关系，进而估算塔机起重臂的疲劳寿命。结果表明：应力强度因子幅随裂纹长度的增加而增大，当裂纹长度到达某一值后，应力强度因子幅呈指数型加快形式，故采取有效措施防止裂纹的快速扩展，可提高结构的疲劳寿命。
- 焊接构件 /
- 应力强度因子 /
- 有限元数值模拟 /
- 疲劳裂纹扩展寿命
Abstract: Aiming at welded structure inevitably cracks phenomenon, we build tower crane boom finite element model, taking into account the effect of residual stress, which is used to calculate QTZ40 tower crane jib bottom chord and horizontal web welding rod at full load and no-load state car horn, different crack lengths corresponding to the stress intensity factor, through simulation analysis. Then we establish stress intensity factor range as a function of the crack length, and then estimate the tower crane arm fatigue life. The results show that: with the stress intensity factor range crack length increases, when the crack length reaches a certain value, the stress intensity factor range exponentially accelerated form, so to take effective measures to prevent the rapid expansion of the crack can improve the fatigue life.
- ABAQUS /
- computer simulation /
- fatigue crack propagation /
- fatigue crack propagation life

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参考文献(10)

[1]	侯沂,李世六,王进,等.塔式起重机钢结构疲劳寿命研究[J].土木建筑与环境工程,2009,(31):24-30 Hou Y, Li S L, Wang J, et al. Fatigue life of tower crane steel structure study [J]. Journal of Civil Engineering and Environmental Engineering,2009,(31):24-30 (in Chinese)
[2]	胡健锋,冯建军,杨香凡,等.平头塔式起重机起重臂疲劳损伤寿命分析[J].设计研究,2012,(2):54-56 Hu J F, Feng J J, Yang X F, et al. Flat head tower crane life of fatigue damage analysis[J]. Journal of Design Research,2012,(2):54-56 (in Chinese)
[3]	胡殿印,王荣桥,邓俊.基于有限元方法的裂纹扩展寿命预测[J].机械强度,2011,31(2):264-268 Hu D Y, Wang R Q, Deng J. Based on the finite element method of crack propagation life prediction[J]. Journal of Mechanical Strength,2011,31(2):264-268 (in Chinese)
[4]	李曙林,李寿安.某型飞机机翼Ⅱ梁框疲劳寿命研究[J].机械科学与技术,2005,24(6):686-688 Li S L, Li S A. An aircraft wing II beam frame of research on fatigue life of[J]. Mechanical Science and Technology,2005,24(6):686-688 (in Chinese)
[5]	程靳,赵树山.断裂力学[M].北京:科学出版社,2006 Jin C, Zhao S S. Fracture mechanics[M]. Beijing: Science Press,2006 (in Chinese)
[6]	王兴路.焊接结构件疲劳分析方法及在塔机起重臂上的应用研究[D].西安:西安建筑科技大学,2013 Wang X L. Welded structure fatigue analysis method and the tower crane boom on the application studies of[D]. Xi'an: Xi'an University of Architecture and Technology,2013 (in Chinese)
[7]	张宏伟,贺利乐.塔式起重机起重臂疲劳裂纹扩展的机理分析[J].煤矿机械,2012,33(8):112-114 Zhang H W. The mechanism of tower crane jib fatigue crack propagation analysis[J]. Journal of Coal Mine Machinery,2012,33(8):112-114 (in Chinese)
[8]	Mohammadi S. Extended finite element method[M]. London:Blackwell Publishing Ltd,2008
[9]	陶炎文.塔式起重机的疲劳寿命预测技术研究[D].西安:西安建筑科技大学,2012 Tao Y W. Tower crane's fatigue life prediction technology research[D]. Xi'an: Xi'an University of Architecture and Technology,2012 (in Chinese)
[10]	包世洪.塔式起重机的使用寿命和评估[J].建设机械技术与管理,2008,(5):130-133 Bao S H. The service life of tower crane and evaluation[J]. Construction Machinery Technology and Management,2008,(5):130-133 (in Chinese)