摘要
超设计役龄的起重机呈现逐年增长的趋势,大批的服役起重机,由于损伤的累积,钢结构性能退化,形成了极大的安全隐患。因此,对服役起重机箱梁结构的疲劳强度计算具有十分重要的意义。以有限元软件ANSYS为工具,建立在役起重机箱梁结构的三维裂纹模型。通过单元节点耦合的方法,将壳单元与体单元有效连接,保证了计算结果的精确性,并采用奇异单元计算在不同长度初始裂纹下在役起重机焊接箱形梁的应力强度因子,运用Matlab软件对结果值进行曲线拟合,并与实验结果相比较,结果表明该法可获得较好的精度,有利于三维裂纹分析在工程中的推广应用。
The number of cranes that are designed overaged presents the trend of increasing year by year,and a large number of cranes,due to the accumulation of damage,the steel structure performance degradation,form the great potential of safety hazard.Therefore,the fatigue strength calculation of box girder structure of cranes in service is of great significance.3D crack of the box girder of existing crane is simulated with ANSYS.Using the method of coupling unit nodes to connect the shell and unit element to ensure the accuracy of the calculation;in addition,the stress intensity factor of the box girder of existing crane under different length of initial cracks is also calculated by adopting singular elements.Compared with the experimental results,the results show good precision that can be attained by the approach,which favors the application extension of 3D crack analysis in engineering.
出处
《机械设计与制造》
北大核心
2013年第7期199-202,共4页
Machinery Design & Manufacture
