基于EIFS和P-M的海底管道腐蚀疲劳寿命预测  

Corrosion fatigue life prediction of submarine pipe based on EIFS and P-M

作　　者：李修波 余建星[1,2] 谭玉娜 冯志强 韩翔希[3] 符妃[3] LI Xiubo;YU Jianxing;TAN Yuna;FENG Zhiqiang;HAN Xiangxi;FU Fei(State Kay Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China;Institute of Mechanical and Marine Engineering,Qinzhou University,Qinzhou 535011,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]高新船舶与深海开发装备协同创新中心,上海200240 [3]钦州学院机械与船舶海洋工程学院,广西钦州535011

出　　处：《海洋工程》2019年第1期84-92,共9页The Ocean Engineering

基　　金：国家科技重大专项资助项目(2016ZX05028005-004);国家自然科学基金青年基金(51609169)

摘　　要：鉴于腐蚀疲劳损伤的特殊性,研究了点蚀过程和腐蚀疲劳裂纹扩展过程。基于等效初始缺陷尺寸(EIFS)和线性累积损伤理论(P-M)方法,消除了点蚀形核、蚀坑生长及腐蚀疲劳短裂纹扩展对腐蚀疲劳寿命预测的影响;避免了基于单点蚀坑建立的腐蚀疲劳寿命预测表达式的弊端;合理地简化了随机荷载下腐蚀疲劳寿命的预测流程。利用现有试验数据,对基于EIFS和P-M方法建立的腐蚀疲劳寿命预测表达式进行了模型验证。结果显示,所提模型的有效性和合理性得到了验证,为工程实际中海底管道的腐蚀疲劳寿命预测提供了一种可行方法。According to the specificity of corrosion fatigue damage,the pitting process and the corrosion fatigue crack propagation process were studied separately.Based on the equivalent initial defect size(EIFS)and the linear cumulative damage(P-M)methods,the effects of pitting nucleation,pit growth,and corrosion fatigue-induced small crack propagation on the prediction of corrosion fatigue life are eliminated;the drawbacks of the expression of predicting corrosion fatigue life based on a single pit are avoided;and the prediction process of corrosion fatigue life under random load is rationally simplified.Based on the existing experiments,the model of corrosion fatigue life prediction based on the EIFS and P-M methods is verified.The results show that the rationality and accuracy of the proposed model are verified,and a feasible method for predicting the corrosion fatigue life of submarine pipe in practical projects is thus provided.

关 键 词：腐蚀疲劳 等效初始缺陷尺寸 P-M 疲劳寿命 海底管道 随机荷载 

分 类 号：TG142.4[一般工业技术—材料科学与工程]