船用双相不锈钢焊接结构疲劳性能研究  

Study on welded structure fatigue of DSS used in shipbuilding

作　　者：王智祥[1] 王正伦[2] 张鑫[2] 

机构地区：[1]重庆交通大学船舶工程中心,重庆400074 [2]重庆交通大学机电与汽车工程学院,重庆400074

出　　处：《船舶力学》2012年第5期573-579,共7页Journal of Ship Mechanics

基　　金：重庆市科委重大科技攻关项目"特种船舶焊接技术研究(CATC2008AB3033)"

摘　　要：文章对船用双相不锈钢焊接结构的焊缝、影响区和母材在不同应力比下分别进行了疲劳裂纹扩展实验,同时利用有限元分析软件进行了数值模拟,得到了裂纹扩展速率da/dN与应力强度因子ΔK的关系曲线。研究结果表明:船用双相不锈钢焊接结构中焊缝裂纹扩展速率最低,抗疲劳裂纹扩展能力最高;母材疲劳裂纹扩展速率最高,抗疲劳裂纹扩展能力最差;焊缝对应力变化的灵敏度最高,热影响区次之,母材最弱;通过实验与模拟对比分析,表明数值模拟对船用双相不锈钢疲劳裂纹扩展速率定量分析是正确的且方法可行。The fatigue crack growth grate in weld metal,heat-affected zone and base metal of Duplex Stain-less Steel（DSS） used in shipbuilding was tested at different stress ratios.FEM analysis software was used to simulate the steel under different stress ratio at the same time,and the da/dN-ΔK curves of this steel were obtained.The research results show that the fatigue crack growth rate of weld metal is the slowest and the ability to resist fatigue crack growth is the highest in the three parts,the lowest is base metal.Secondly,the sensitivity caused by the stress change of weld metal is the highest,and the lowest is base metal.The com-parison between finite element simulation and experiment shows that the simulation of fatigue crack growth rate of DSS used in shipbuilding is completely correct and feasible.

关 键 词：双相不锈钢 化学品船 焊接 疲劳 有限元 

分 类 号：U668.2[交通运输工程—船舶及航道工程]