| 焊接结构超高周疲劳主S-N曲线拟合及寿命预测方法 |
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| 引用本文： | 周韶泽,郭硕,陈秉智,张军,兆文忠.焊接结构超高周疲劳主S-N曲线拟合及寿命预测方法[J].焊接学报,2022,43(5):76-82. |
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| 作者姓名： | 周韶泽 郭硕 陈秉智 张军 兆文忠 |
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| 作者单位： | 大连交通大学, 大连, 116028 |
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| 基金项目： | 国家高速列车技术创新中心研发计划;大连市科技创新基金项目 |
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| 摘 要： | 超声波疲劳试验是获得焊接接头超高周疲劳强度的实用方法.?目前还没有有效方法能够预测和评估任意焊接接头形式的超声超高周疲劳寿命.?文中提出了一种超声简谐共振条件下,评估焊接接头疲劳寿命的瞬态结构应力法,以及超声超高周疲劳主S-N曲线拟合方法.?基于已公开的300个焊接接头试验数据,拟合了铝合金焊接接头20?kHz超高周主...
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| 关 键 词： | 超高周疲劳 结构应力法 焊接接头 主S-N曲线 超声波振动 |
| 收稿时间： | 2021-11-16 |
Master S-N curve fitting and life prediction method for very high cycle fatigue of welded structures |
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| Affiliation: | Dalian Jiaotong University, Dalian, 116028, China |
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| Abstract: | Ultrasonic fatigue testing is a practical method for obtaining very high cycle fatigue (VHCF) strength of welded joints. However, there is no effective method to predict and evaluate the ultrasonic VHCF life of arbitrary welded joint forms. A transient structural stress method for assessing the fatigue life of welded joints under ultrasonic harmonic resonance conditions as well as a method for fitting the master S-N curve for VHCF are proposed. Based on the published test data of 300 welded joints, a 20 kHz VHCF master S-N curve of aluminum alloy welded joints was fitted. The response equivalent structural stress spectrum was obtained by resonance model transient simulation analysis and post rain flow counting. With the spectrum and the VHCF master S-N curve, the fatigue life of welded structures is predicted. The results show that the structural stress concentration factor does not change due to vibration or external load magnitude changes in welded joints. The fitted ultrasonic VHCF master S-N curve is a new narrow band with m = 16.5, which extends the applicability of the master S-N curve method theory to the very high cycle region and can be used for ultrasonic vibration VHCF life prediction of welded structural parts with any joint forms. |
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