张崎

个人信息Personal Information

副教授

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:船舶工程学院

电子邮箱:zhangqi@dlut.edu.cn

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FATIGUE DAMAGE ESTIMATION OF WELDED JOINTS CONSIDERING MECHANOCHEMICAL INTERACTION

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论文类型:会议论文

发表时间:2017-06-25

收录刊物:EI、CPCI-S

卷号:3A-2017

关键字:Mechanochemical effect; Non-uniform corrosion; Hot spot stress; Fatigue damage

摘要:The high stress region around weld joints accelerates corrosion and may induce non-uniform corrosion. In this study, the effect of loading on corrosion behavior of the steel in NaCl solution was investigated. The relationship between the corrosion rate and applied loading was deduced based on the electrochemical theory. Electrochemical experiments were carried out to investigate the interaction between loading and corrosion rate on Q235 steel. A butt weld joint of ship deck structure was selected as a case study. Time-dependent stress concentration factor of welded joint as a function of the corrosion deterioration was analyzed, and the iterative process of stress and corrosion degeneration of plate thickness was used to simulate the coupling effect based on results of the experiment. The hot spot stress approach was adopted to calculate the fatigue damage.