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Investigation on the stress concentration effect at the corroded surface achieved by atmospheric exposure test

机译:大气暴露试验研究腐蚀表面应力集中效应

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摘要

In this study, the time-dependent stress concentration effects on the corroded surface of a steel structure with deteriorated paint coating were examined to investigate potential fatigue problems and stress concentration levels. Toward this end, atmospheric exposure tests were conducted on carbon steel in different atmospheric environments for four years, and the stress concentration effects on the corroded surface were numerically analyzed based on these tests. The spatial coordinates of the corroded surface were imported using a laser scanning program for finite element (FE) analyses. The experimental tests and numerical analysis showed that the maximum stress occurred at the maximum corroded depth on the corroded surfaces. The stress concentration factor (SCF) under time-dependent atmospheric exposure conditions was ~1.6 for the uniform corroded surface. The SCF of the localized corroded surface sharply increased to ~3.0 in the deeper localized corrosion pit. Therefore, fatigue crack nucleation can develop from the stress concentration of the corroded surface with localized corrosion where the paint coating of the structural steel member has deteriorated.
机译:在这项研究中,研究了随时间变化的应力集中对涂膜变质的钢结构腐蚀表面的影响,以研究潜在的疲劳问题和应力集中水平。为此,在不同的大气环境下对碳钢进行了四年的大气暴露测试,并基于这些测试对腐蚀表面上的应力集中效应进行了数值分析。使用激光扫描程序导入腐蚀表面的空间坐标以进行有限元(FE)分析。实验和数值分析表明,最大应力发生在腐蚀表面最大腐蚀深度处。随时间变化的大气暴露条件下,均匀腐蚀表面的应力集中因子为〜1.6。在较深的局部腐蚀坑中,局部腐蚀表面的SCF急剧增加至〜3.0。因此,从结构钢构件的涂膜劣化的局部腐蚀的腐蚀面的应力集中可以产生疲劳裂纹形核。

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