武汉工程大学学报2012，Vol.34Issue(12)：50-53,4.DOI:10.3969/j.issn.1674-2869.2012.12.012
含裂纹法兰接管的应力强度因子数值计算
Numerical analysis of stress intensity factor of cracked nozzle flange
何家胜 1魏卫 1朱晓明 2陈伟 2张林 2杨峰2
作者信息
- 1. 武汉工程大学机电工程学院,湖北武汉430074
- 2. 中国石油化工股份有限公司武汉分公司,湖北武汉430082
- 折叠
摘要
Abstract
Because of the effect of the corrosive media in the process of refining the oil, the cracks often appear in the girth welds connecting the nozzle and flange with high stress, which causes significant security risks to the pipeline run. A fracture mechanics finite element analysis model based on the theory of fracture mechanics of the nozzle flange with girth weld penetrating crack was established to calculate the stress intensity factor (SIF) by using the method of 1/4-displacement of the finite element and setting 3D singular elements along the front edge of crack. The distribution of the stress intensity factor (SIF) of the points in the front edge of crack was gotten in the case of different crack length. According to the calculated data, the variation curve of SIF was obtained and the location of the maximum SIF was discovered. The maximum stress intensity factor (SIF) is at the crack front near the nozzle flange outer surface. The stress intensity factor (SIF) is an important parameter for the safety assessment in pressure vessels and piping with defects.关键词
法兰接管/有限元/1/4节点奇异单元/应力强度因子Key words
nozzle flange/finite element method/ 1/4-displacement of finite element/ stress intensity factor分类
化学化工引用本文复制引用
何家胜,魏卫,朱晓明,陈伟,张林,杨峰..含裂纹法兰接管的应力强度因子数值计算[J].武汉工程大学学报,2012,34(12):50-53,4.
