管路外表面裂纹应力强度因子研究
Research on stress intensity factors of external surface cracks of pipeline
周知进 1闻多 2冷晓峰2
作者信息
- 1. 广西科技大学 机械与汽车工程学院,广西 柳州 545003;贵州理工学院 机械工程学院,贵州 贵阳 550000
- 2. 广西科技大学 机械与汽车工程学院,广西 柳州 545003
- 折叠
摘要
油气管道裂纹会降低管路的承载能力甚至会带来危险,因而研究带内压的有裂纹管道的安全性成为迫切需要解决的问题.以椭圆表面裂纹的管道为研究对象,通过对裂纹体进行有限元软件和三维裂纹分析软件联合仿真,研究裂纹体的应力云图和裂纹应力强度因子变化.研究结果表明:径向裂纹若增大倾斜角与深度,将增加裂纹前缘的应力集中;增加裂纹倾斜角度,Ⅰ型裂纹应力强度因子和J积分会小,Ⅱ型和Ⅲ型裂纹应力强度因子会增加;椭圆裂纹的深度加大会让裂纹前缘的Ⅰ型裂纹应力强度因子和J积分变大,但两端处值的增长速度大于尖端处;裂纹长度的增加会让裂纹尖端附近Ⅰ型裂纹应力强度因子和J积分增长速率大于裂纹两端处.研究结果为管道裂纹扩展与控制提供技术支撑.
Abstract
Cracks in oil and gas pipelines will reduce the load carrying capacity of the pipelines,and even bring dangers.Therefore,studying the safety of cracked pipelines with internal pressure has become an urgent issue.Taking the hemispher-ical pipeline with surface cracks as the research object,the change of von-Mises and stress intensity factor of the crack body are studied by the joint simulation of FEA software and three-dimensional crack analysis software.The results show that if the tilt angle and depth of the radial crack increase,the stress concentration of the leading edge of the crack will increase.With the increase of crack inclination angle,the stress intensity factor of type Ⅰ crack and the J integral will decrease,while the stress intensity factor of type Ⅱ and Ⅲ cracks will increase.Increasing the depth of elliptical crack will increase the stress intensity factor of type Ⅰ crack and the J integral at the crack front,but the growth rate of the values at both ends is fas-ter than that at the tip.With the increase of crack length,the stress intensity factor of type Ⅰ crack and the J integral growth rate near the crack tip are larger than those at both ends of the crack.The research results can provide technical support for pipeline crack growth and control.
关键词
管路/表面裂纹/应力强度因子Key words
pipeline/surface cracks/stress intensity factor引用本文复制引用
基金项目
国家自然科学基金(51479073)
贵州理工学院科技专项(KJZX17-014)
出版年
2024
NETL
NSTL
维普
万方数据