摘要
针对在役管道严重的腐蚀疲劳倾向性,比较前人相关的研究方法,提出了一种以大试样(480 mm×38 mm×12 mm)纯弯曲来研究低周腐蚀疲劳的新方法。以“西气东输”输气用螺旋焊管(X70)为研究对象在两种腐蚀环境下(大气、3%NaCl水溶液)进行了验证实验,并在实验基础上建立了裂纹扩展速率的经验公式ddNl=a+b.ln(p.ΔK)并确定了常数a、b。根据实验获得的数据结合计算软件Maple估算了两种腐蚀环境下构件的剩余使用寿命,获得的三维关系图对解决实际问题具有指导意义。
Aiming at the severe corrosion fatigue tendency of the pipeline in-service, a new low-cycle corrosion fatigue method of using a large purely-bended sample（480 mm× 38 mm×12 mm） was developed. The samples were cut from the buried arc welded spiral pipeline （X40） used for West-east gas transmission. An experiential formula about crack growth rate,dl/dN=a＋b · ln（p ·△K）, has been established via the experimental results in two different environments of atmosphere and 3% NaCl solution, and the two constants of a and b were identified. The residual life of the sample was estimated by Maple software under two different conditions. The obtained 3D relationship charts have the directive meaning in solving the actual oil and gas pipeline problems.
出处
《腐蚀与防护》
CAS
北大核心
2007年第5期235-237,共3页
Corrosion & Protection
关键词
油气管道
纯弯曲
低周腐蚀疲劳
剩余寿命预测
Oil and gas pipeline
Pure-bend
Low-cycle corrosion fatigue
Residual life prediction
