摘要
该文重点研究Q690焊接高强钢管截面纵向残余应力分布模式,利用商业有限元分析软件ANSYS对其进行数值模拟,运用其中的"生死单元"和热-结构耦合分析功能来模拟焊接过程,以管径与壁厚为变量,设计3组共12个有限元模型。通过对模型的数值分析,得到每个模型的截面纵向残余应力分布形式,经过对比分析得出其规律,并提出Q690焊接高强钢管截面纵向残余应力的简化分布模式。结果表明,其分布模式与Wagner提出的分布模式接近,但Q690高强钢管的纵向残余压应力峰值与其屈服强度的比值仅为0.2,要明显小于普通钢管纵向残余压应力峰值与其屈服强度的比值0.35。
The distribution of longitudinal residual stresses in Q690 welded high-strength steel pipe is analyzed. The ‘life and death element' and thermal-structural coupling analysis function of ANSYS are used to simulate the welding process. With the variables of pipe diameter and wall thickness, three groups of twelve finite element models are designed. The longitudinal residual stress distribution of each model is derived from numerical analysis, and the regularity of the residual stress distribution is obtained by comparison. A simplified distributional pattern for longitudinal residual stress in Q690 high-strength welding steel pipe is proposed. The results show that it is similar to the distributional pattern which Wagner proposed, but the ratio of residual compressive peak stress to the yield stress for Q690 high-strength welding steel pipe is 0.2, which is less than that of normal-strength welding steel pipe.
出处
《工程力学》
EI
CSCD
北大核心
2014年第10期108-115,共8页
Engineering Mechanics
关键词
Q690高强钢管
焊接残余应力
数值分析
生死单元
热-结构耦合分析
Q690 high-strength steel pipe
welding residual stress
numerical analysis
life and death element
thermal-structural coupling analysis
