摘要
为解决椭球体、圆柱体和矩形体施痕物产生的管道凹痕缺陷问题,应用ANSYS有限元软件建立施痕物作用于管道的三维模型。通过求解模型,分析凹痕深度、施痕物尺寸和管道壁厚改变时管道凹痕处最大残余应力的变化规律,拟合出残余应力与各参数关系表达式。研究结果表明:3种施痕物下管道凹痕处残余应力随着凹痕深度和管道壁厚的增加而增大,椭球体施痕物下管道凹痕处残余应力随着施痕物尺寸的增加而增大,圆柱体和矩形体施痕物则恰好相反;施痕物为椭球体或圆柱体,采用幂函数拟合残余应力与各参数关系表达式效果较好;施痕物为矩形体,采用指数函数拟合残余应力与各参数的关系表达式效果较好。
To solve the problem of dent defects on the pipeline produced by the ellipsoid,cylinder and rectangle indenters,a three-dimensional model of indenter acting on pipeline was established by using the ANSYS finite element software. The variation laws of the maximum residual stress at the dent of pipeline when the dent depth,the indenter size and the wall thickness changed were analyzed through solving the model,and the expressions of the relationship between the residual stress and each parameter were obtained by fitting. The results showed that the residual stress at the dent of pipeline under three kinds of indenters increased with the increase of dent depth and wall thickness of pipeline. The residual stress at the dent of pipeline under the ellipsoid indenter increased with the in-crease of the indenter size,while the cylinder and rectangle indenters were just contrary. When the indenter was ellipsoid or cylinder,the expression of the relationship between the residual stress and each parameter obtained by fitting with power function had the better effect. When the indenter was rectangle,the expression of the relationship between the residual stress and each parameter obtained by fitting with exponential function had the better effect.
作者
张鹏
黄云飞
伍颖
ZHANG Peng, HUANG Yunfei, WU Ying(School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu Sichuan 610500, Chin)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2018年第7期141-147,共7页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(5974105)
中国工程院重大咨询研究项目(2011-ZD-20)
高等学校博士学科点专项科研基金项目(20105121110003)
关键词
凹痕管道
残余应力
数值模拟
回归分析
安全性
dented pipeline
residual stress
numerical simulation
regression analysis
safety
