| 焊接节点低温疲劳试验与低温主S-N曲线的构建 |
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| 引用本文： | 郑杰瑜,王艺陶,刘俊杰,胡嘉骏,吴剑国,廖小伟.焊接节点低温疲劳试验与低温主S-N曲线的构建[J].海洋工程,2021,39(6):126-135. |
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| 作者姓名： | 郑杰瑜 王艺陶 刘俊杰 胡嘉骏 吴剑国 廖小伟 |
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| 作者单位： | 浙江工业大学 土木工程学院, 浙江 杭州 310023;中国船舶科学研究中心, 江苏 无锡 214082 |
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| 基金项目： | 国家自然科学青年基金项目（51908501，52001284）；江苏省自然科学基金青年基金项目（BK20200166） |
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| 摘 要： | 为了拓展主S-N曲线法，使之更好地适用于低温、极地环境下船舶与海洋工程结构物的疲劳评估，进行了EH36材料T型焊接接头的低温疲劳性能试验，收集了国内外多个焊接节点低温疲劳数据，建立了疲劳试验试件的有限元模型，运用等效结构应力法，计算焊接节点的等效结构应力，构建低温环境下焊接节点的主S-N曲线。使用该曲线，预测低温疲劳试验的寿命，并与疲劳试验结果、常温主S-N曲线、常温中值D曲线的预测结果进行了比较，结果表明，所提低温主S-N曲线预测方法具有较高精度，可用于低温环境下船舶与海洋结构物疲劳寿命的预测。
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| 关 键 词： | 等效结构应力法|主S-N曲线|低温疲劳|焊接接头|有限元分析 |
| 收稿时间： | 2021/1/11 0:00:00 |
Fatigue test of welded joints and construction of the master S-N curve for low temperature |
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| ZHENG Jieyu,WANG Yitao,LIU Junjie,HU Jiajun,WU Jianguo,LIAO Xiaowei.Fatigue test of welded joints and construction of the master S-N curve for low temperature[J].Ocean Engineering,2021,39(6):126-135. |
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| Authors: | ZHENG Jieyu WANG Yitao LIU Junjie HU Jiajun WU Jianguo LIAO Xiaowei |
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| Institution: | College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China;China Ship Scientific Research Center (CSSRC), Wuxi 214082, China |
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| Abstract: | In order to expand the master S-N curve method and make it more suitable for the fatigue assessment of ships and offshore engineering structures in low temperature and polar environments, we carried out the low temperature fatigue performance test of the T-welded joints of EH36 material, and collected many domestic and foreign low-temperature fatigue data of welded joints. A finite element model of the fatigue test specimen was established, and the equivalent structural stress method was used to calculate the equivalent structural stress of welded joints to construct the master S-N curve of welded joints under low temperature environment. This curve was used to predict the life of the low-temperature fatigue test, and compared with the prediction results of the fatigue test results, the normal temperature master S-N curve, and the normal temperature median D curve. The results show that the proposed low temperature master S-N curve prediction method has higher accuracy and can be used to predict the fatigue life of ships and marine structures in low temperature environments. |
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| Keywords: | equivalent structural stress|the master S-N curve|low-temperature fatigue|welded joints|finite element analysis |
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