含不同尺寸双腐蚀缺陷L245NCS钢管剩余强度计算
孙溢彬 贾文龙 李长俊 党文俊 方天海 张洋铭
作者信息
摘要
基于非线性有限元方法,建立含腐蚀缺陷管道的剩余强度计算模型,采用实验数据验证模型的准确性。在此基础上,以I245NCS管道为对象,研究了管道内腐蚀缺陷间轴向和环向的距离对剩余强度的影响。通过多因素影响分析,修正了ASME B31G标准中含双点腐蚀缺陷管道剩余强度的公式。结果表明:缺陷间在一定距离内会存在相互作用且发生相互作用的极限距离随缺陷深度的增加而增加;采用DNV-RP-F101标准计算的双缺陷相互影响的极限轴向间距和极限环向角度偏大,标准计算值与有限元计算值的最大相对误差达41% ;修正后的剩余强度计算公式可用于计算含不同尺寸双腐蚀缺陷的中低强度管道的剩余强度,且计算结果相比于ASME B31G公式更接近实验值,平均相对误差为1.80% ,较ASME B31G下降了9.86%。
Abstract
Based on the nonlinear finite element method , the residual strength calculation model of thepipeline with corrosion defects is established, and the accuracy of the model is verified by experimentaldata.On this basis , with L245NCS pipeline as the object , the influence of the axial and circumferentialdistance between corrosion defects in the pipeline on the residual strengthis studied. Through multi-factorinfluence analysis , the formula for residual strength of pipelines with double-point corrosion defects in the ASME B31G standard is revised.'The results show that :There is an interaction between defects within acertain distance and the limit distance for interaction increases with the increase of defect depth. The limitaxial distance and the limit hoop angle of the mutual influence of double defects calculated by the DNV-RP-F101 standand are too large , and the maximum relative error between the standard calculation valueand the finite element calculation value is 41 % . The modified residual strength calculation formula can beused to calculate the residual strength of medium and low strength pipelines with double corrosion defectsof different size , and the calculated result is closer to the experimental value than ASME B31G formula,with an average relative error of 1.80% , which is 9.86% lower than that of ASME B31G.关键词
双腐蚀缺陷/剩余强度/极限间距/计算公式/有限元引用本文复制引用
孙溢彬,贾文龙,李长俊,党文俊,方天海,张洋铭.含不同尺寸双腐蚀缺陷L245NCS钢管剩余强度计算[EB/OL].(2023-03-20)[2026-04-02].https://chinaxiv.org/abs/202303.00421.学科分类
石油天然气储运/材料科学/油气能源、油气节能
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