不同腐蚀修正方式对LNG船疲劳强度评估的影响  

Influence of Different Corrosion Correction Methods on Fatigue Strength Assessment of LNG Vessel

作　　者：陈锋[1,2] 刘俊[1,2] 

机构地区：[1]海洋工程国家重点实验室(上海交通大学),上海200240 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《船舶工程》2015年第7期15-17,89,共4页Ship Engineering

摘　　要：船舶航行于江河湖海且装载各种货物,这决定了其构件常常承受交变载荷和腐蚀环境的共同作用,进行疲劳强度评估时必须对腐蚀介质的影响加以考虑。依据中国船级社2013年版《船体结构强度指南》,对某LNG船底边舱折角的节点疲劳强度进行了计算,分别采用腐蚀修正系数,腐蚀条件下S-N曲线和扣除腐蚀余量等三种修正方式来考虑腐蚀对疲劳强度评估的影响。研究表明,采用腐蚀条件下S-N曲线方法校核最为苛刻,扣除腐蚀余量1.5mm的结果和腐蚀修正系数1.08的结果接近。As ships always sailing in water with different cargos onboard, ship structure is actually in the state of complex corrosion fatigue. Corrosion should be taken into account in fatigue analysis. According to ＂Fatigue Assessment of Ship Structure 2013＂ by CCS, the fatigue strength of bottom side tank joint of a LNG vessel is assessed. Three methods are used for the correction of corrosion fatigue, that is, the method of fatigue factor, the method of S-N curves in corrosive environment and the method of deduction of corrosion addiction. The results show that the method of using S-N curves in corrosive environment is the strictest. The result reducing the corrosion addiction 1.5mm and the result of fatigue factor 1.08 are close.

关 键 词：LNG船 腐蚀疲劳 S-N曲线法 热点应力法 

分 类 号：U661.43[交通运输工程—船舶及航道工程]