| 焊接构件低温疲劳P-S-N曲线的研究 |
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| 引用本文： | 贾星兰,刘文.焊接构件低温疲劳P-S-N曲线的研究[J].北京航空航天大学学报,2001,27(6):684-686. |
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| 作者姓名： | 贾星兰 刘文 |
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| 作者单位： | 北京航空航天大学 飞行器设计与应用力学系 |
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| 摘 要： | 焊接构件的低温 P-S-N曲线是冬季构件抗疲劳设计的基础.在PLG-300 kN高频疲劳试验机上,测定了在-25℃环境下4种应力水平对应的焊接构件的疲劳寿命,并得出了其中值S-N曲线.采用小样本实验的单侧容限分析方法,利用对数疲劳寿命变异系数的经验取值,得出了焊接构件的低温P-S-N曲线.这种方法既简便又经济,但需要由进一步的实验来完善.
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| 关 键 词： | 低温疲劳 可靠性 置信水平 焊接构件 安全寿命 |
| 文章编号： | 1001-5965(2001)06-0684-03 |
| 收稿时间： | 2000-03-30 |
| 修稿时间： | 2000年3月30日 |
P-S-N Curve of Fatigue at Low Temperatures of Welded Components |
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| JIA Xing-lan,LIU Wen-ting.P-S-N Curve of Fatigue at Low Temperatures of Welded Components[J].Journal of Beijing University of Aeronautics and Astronautics,2001,27(6):684-686. |
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| Authors: | JIA Xing-lan LIU Wen-ting |
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| Institution: | Beijing University of Aeronautics and Astronautics, Dept. of Flight Vehicle Design and Applied Mechanics |
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| Abstract: | The P-S-N curve of fatigue at low temperatures is the design basis against fatigue of welded components in winter. The fatigue life of welded components at -25℃ temperature was measured on PLG-300 kN high-frequency fatigue testing machine at four stress levels, and the S-N curve of welded components was derived. The P-S-N curve of fatigue at low temperatures was theoretically obtained by using the method of single side tolerance analysis of small-number specimen experiments and the experiential CV value of logarithmic fatigue life (lgN ) of welded components. This method is a simple and economic one, but its perfection needs more experimental data. |
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| Keywords: | fatigue at low temperatures reliability confidence levels welded component safe life |
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