压力容器2025，Vol.42Issue(12)：20-31,12.DOI:10.3969/j.issn.1001-4837.2025.12.003
冻土环境下含复杂腐蚀缺陷管道失效压力研究
Study on the failure pressure of pipelines with complex corrosion defects in frozen soil environment
摘要
Abstract
To address the mechanical performance issues of corroded pipelines in permafrost regions,to investigate the failure pressure and stress variation patterns of complex corroded pipelines,a finite element numerical model containing complex corrosion defects was proposed and established.The effects of parameters such as corrosion depth and length on failure pressure and stress distribution were analyzed.The results indicate that when the shallow corrosion depth is fixed at 10%of the wall thickness,increasing the deep corrosion depth from 20%to 80%leads to a 30.3%decrease in failure pressure;while under the condition that the deep corrosion depth is increased by 10%based on the shallow corrosion depth,increasing the shallow corrosion depth from 10%to 70%results in a sharp 58.2%decrease in failure pressure.In contrast,the influence of length parameter variations is weaker:when the shallow corrosion length increases from 250 mm to 400 mm,the failure pressure decreases by only 7.7%;when the deep corrosion length increases from 50 mm to 200 mm,the failure pressure reduction is 10.9%.The equivalent stress reaches its maximum value at the circumferential center at the junction of the deep and shallow corrosion.Regarding the influence law of corrosion parameters on failure pressure,the corrosion depth has the most significant impact,followed by the corrosion length.A failure pressure prediction formula for buried pipelines with complex corrosion in permafrost regions was fitted based on the failure pressure data set obtained from numerical simulations,providing theoretical support for the operation and inspection of pipelines in permafrost regions.关键词
埋地管道/复杂腐蚀/失效压力/拟合公式Key words
buried pipeline/complex corrosion/failure pressure/fitting formula分类
机械制造引用本文复制引用
李晓丽,张馨月,陈国飞,李廷辉,杨金明..冻土环境下含复杂腐蚀缺陷管道失效压力研究[J].压力容器,2025,42(12):20-31,12.基金项目
国家自然科学基金面上项目(52076036) （52076036）
