[1]贺利乐,王兴路,孙 环.塔机起重臂钢结构疲劳裂纹扩展的数值分析[J].西安建筑科技大学学报:自然科学版,2014,46(05):758-761.[doi:10.15986/j.1006-7930.2004.05.025]
　HE Lile,WANG Xinglu,SUN Huan.Numerical analysis of fatigue crack growth on thesteel structure of the tower crane jib[J].J.Xi’an Univ. of Arch. & Tech.:Natural Science Edition,2014,46(05):758-761.[doi:10.15986/j.1006-7930.2004.05.025]
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塔机起重臂钢结构疲劳裂纹扩展的数值分析()
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西安建筑科技大学学报:自然科学版[ISSN:1006-7930/CN:61-1295/TU]

卷:
46
期数:
2014年05期
页码:
758-761
栏目:
出版日期:
2014-10-31

文章信息/Info

Title:
Numerical analysis of fatigue crack growth on the
steel structure of the tower crane jib
文章编号:
1006-7930(2014)05-0758-04
作者:
贺利乐; 王兴路; 孙 环
(西安建筑科技大学机电工程学院,陕西 西安 710055)
Author(s):
HE Lile;  WANG Xinglu;  SUN Huan
(School of Mechanical and Electrical Engineering, Xi’an Univ. of Arch. & Tech., Xian Shanxi 710055)
关键词:
起重臂钢结构; 应力强度因子; 有限元; 裂纹扩展
Keywords:
steel structure of crane jib;  stress intensity factor;  finite element;  fatigue crack growth
分类号:
TG404; TG405
DOI:
10.15986/j.1006-7930.2004.05.025
文献标志码:
A
摘要:
塔式起重机起重臂的断裂主要由疲劳破坏即疲劳裂纹扩展引起，针对其焊接结构中不可避免地出现裂纹的现象，利用Abaqus建立塔式起重机起重臂有限元模型并求解，计算变幅小车满载和空载状态下塔机起重臂下弦杆与水平腹杆焊接处不同裂纹长度对应的应力强度因子，通过建立裂纹应力强度因子幅与裂纹长度的函数关系估算塔机起重臂的疲劳寿命．结果表明：塔机起重臂下弦杆与水平腹杆焊接处裂纹的应力强度因子幅随裂纹长度的增加而增大，当裂纹长度达到一定值后，应力强度因子幅呈指数型增大，结构的疲劳寿命急剧下降．故焊接结构在制造、使用等环节应采取有效措施减少焊接缺陷、防止裂纹扩展，从而提高其使用寿命．
Abstract:
Fatigue failure is the main reason for fracture of tower crane boom, and fatigue crack growth is one form of such fatigue failure. Aiming at the inevitable phenomenon of welding residual stress appearing on welding mechanical structure, finite element model of tower crane boom is established and solved by ABAQUS. Stress intensity factor at weld joint between lower and level member with different crack length under full load and no load of trolley is calculated, and fatigue life of tower cane boom is estimated by the relation established between stress intensity factor range and crack length. The results show that the stress intensity factor range at weld joint between lower and level member increase with the augment of crack length; the stress intensity factor range increase presents exponent form. Once the crack length reaches a certain value, fatigue life of tower crane structure drops sharply. Effective measures should be adopted to reduce the weld defects and prevent the growth of crack in the steps of manufacture and usage, and the service life of welding structure could be increased.

参考文献/References:

References
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备注/Memo

备注/Memo:
收稿日期：2013-10-21 修改稿日期：2014-09-25
作者简介：贺利乐（1963-），男，博士，教授，主要从事工程机械结构抗疲劳可靠性分析与设计．E-mail：Hllnh2013@163.com
更新日期/Last Update: 2015-10-10