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论文类型：期刊论文

发表时间：2016-07-01

发表刊物：INTERNATIONAL JOURNAL OF FATIGUE

收录刊物：SCIE、EI

卷号：88

页面范围：88-95

ISSN号：0142-1123

关键字：Coupling effect; Mechanochemical experiment; Nonuniform corrosion; Welded joint; Hot spot stress; Fatigue damage

摘要：This paper presents a new approach to assess time-dependent corrosion fatigue damage of welded joint considering the coupling effect between mechanical factor and corrosion factor. The high stress region around weld will accelerate corrosion and be more likely to induce nonuniform corrosion of welded joint. And the effect of loading on corrosion behavior of the steel in NaCl solution was investigated. The synergistic effect between applied elastic stress and chemical attack on Q235 steel was evaluated by electrochemical experiments. A side longitudinal of ship structure is selected as a case study. Time-dependent stress concentration factor of welded joint as a function of corrosion deterioration was analyzed, and the iterative process of stress and corrosion degeneration of plate thickness was used to simulate coupling effect basing on the results of experiment. The hot spot stress approach was adopted to calculate the fatigue damage. It is revealed that the nonuniform corrosion could influence fatigue damage of welded joint, and that impact will be more and more significant with the growth of corrosion year. (C) 2016 Elsevier Ltd. All rights reserved.