摘要
采用有限元数值计算方法,考虑材料非线性和几何非线性,对含有两个不同径向夹角和不同轴线间距腐蚀缺陷的内压钢制管道进行应力集中系数变化与影响的分析计算。研究发现,两腐蚀缺陷之间径向夹角和轴线间距并不是单独作用的参数,应力集中系数计算时需考虑其相互影响;通过ANSYS有限元计算分析,经拟合得到腐蚀缺陷在不同角度下的"极限影响距离"公式。该公式综合考虑了两腐蚀缺陷之间夹角和轴线间距的影响,可以用于判断腐蚀缺陷之间是否发生相互作用,进而估计管道上的应力水平。
Finite element method （FEM） considering material and geometric nonlinearity is employed in the present study to analyze the change and influence of the stress concentration factor in an inside-pressured steel pipeline with two corrosion defects different in radial angle and axis-distance. It is shown that the angle and the axisdistance are coupling parameters in stress concentration factor calculating. Therefore, a formula of ＂Critical Influence Distance＂ considering these two parameters is obtained through FEM analysis and curve fitting, which can be used in judging the possibility of defects interaction and then estimating the stress level of steel pipelines.
出处
《钢结构》
2010年第2期79-81,49,共4页
Steel Construction
关键词
钢制管道
有限元
非线性
腐蚀缺陷径向夹角
腐蚀缺陷轴线间距
应力集中系数
极限影响距离
steel pipeline
finite element
nonlinearity
corrosion defects radial angle
corrosion defects axis- distance
stress concentration factor
critical influence distance
