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| 纵向受载T形焊接接头结构应力构造方法分析 |
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董亚飞1,2,3, 魏国前1,2,3, 漆金贤1,2, 余茜1,2, 何毅斌3
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1.武汉科技大学 冶金装备及其控制教育部重点实验室, 武汉 430081;2.武汉科技大学 机械传动与制造工程湖北省重点实验室, 武汉 430081;3.武汉工程大学 化工装备强化与本质安全湖北省重点实验室, 武汉 430205
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| 摘要: |
| 针对纵向受载的非承载型T形焊接接头的疲劳问题，提出一种纵向结构应力构造方法.该方法将焊接接头截面上节点载荷等效为单元边界上的线载荷，根据力平衡原理建立膜应力和弯曲应力解析式，基于母材厚度和焊缝高度提出等效板厚的构造方式，进一步构造并求解焊趾处纵向结构应力.通过纵向受载的非承载型T形焊接接头疲劳试验结果进行验证.结果表明，文中提出方法在分析焊接接头局部纵向受载的焊接结构时优势明显，并可根据Dong提出的平衡等效结构应力修正方式和主S-N曲线进行疲劳评定. |
| 关键词: 纵向受载 结构应力 疲劳寿命 T形焊接接头 |
| DOI：10.12073/j.hjxb.20170507 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51575408）；湖北省自然科学基金资助项目（2014CFB803）；武汉工程大学化工装备强化与本质安全湖北省重点实验室开放课题资助项目（2016KA02）；武汉科技大学研究生科研创新创业基金资助项目（JCX0019） |
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| Longitudinal structural stress constructing approach for non load-carrying T welded joints bearing longitudinal load |
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DONG Yafei1,2,3, WEI Guoqian1,2,3, QI Jinxian1,2, YU Xi1,2, HE Yibin3
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1.School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China;2.Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety, Wuhan Institute of Technology, Wuhan 430205, China;3.Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety (WIT), Wuhan 430205, China
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| Abstract: |
| In order to analyze the fatigue life of non-load-carrying T welded joints bearing longitudinal load, longitudinal structural stress and its constructing approach were proposed. Nodal loads normal to the weld section were converted to the distributive loads along the element edges. Analysis formula of membrane stress and bending stress was established by force balance theory. Equivalent plate thickness was proposed based on the base metal thickness and the weld height. Then the longitudinal structural stress at weld toe was calculated. The approach was verified by fatigue test for non-load-carrying T welded joints bearing longitudinal load. Results show that this approach has obvious advantages to analyze longitudinal loading welded structures,which can be employed to calculate fatigue life by revised equilibrium-equivalent formula, and the master S-N curve according to the theory previously proposed by Dong. |
| Key words: longitudinal load structural stress fatigue life T welded joints |
