摘要
采用双丝CO2气体保护焊方法焊接30 mm厚Q690D钢板全尺寸液压支架顶梁.基于温度热源和热弹塑性算法对局部顶梁结构焊接变形进行计算,获得焊接固有应变,然后将固有应变施加在全尺寸壳单元顶梁模型上进行弹性计算,最终得到液压支架顶梁结构的焊接变形.结果表明,结合小结构模型的热弹塑性法和大结构固有应变法,能高效预测大型结构的焊接变形且能保证一定精度,预测的液压支架顶梁焊接变形结果与试验结果符合较好;液压支架顶梁的焊接变形主要为角变形,且两侧分布不对称.
The welding experiment on 30 mm thick Q690 steel plate in full-scale top beam structure of hydraulic support was carried out. The welding deformation of a relatively small structure selected from the top beam structure was firstly simulated with the thermal-elastic-plastic finite element method based on the efficient heat source model,and then the inherent strain was obtained from the small model,finally the acquired inherent strain was input into the full-scale shell element model of the hydraulic beam support structure to calculate the welding distortion deformation. The results show that,the proposed method can predict the welding deformations of large structures efficiently and accurately,the computational welding deformations of the top beam structure agree well with the experimental results; the angular distortion deformation is the main deformation of the top beam structure,which is not uniform on both sides.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第11期1-4,113,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51275224)
江苏科技大学博士科研启动基金资助项目(35061107)
关键词
液压支架
有限元
固有应变法
数值模拟
焊接变形
hydraulic support
finite element method
inherent strain
numerical simulation
welding deformation
