| TC4钛合金焊接接头疲劳损伤演变模型研究 |
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| 引用本文： | 郭海丁,邬华芝,刘观日,高德平.TC4钛合金焊接接头疲劳损伤演变模型研究[J].航空动力学报,2003,18(2):206-210. |
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| 作者姓名： | 郭海丁 邬华芝 刘观日 高德平 |
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| 作者单位： | 南京航空航天大学,能源与动力学院,江苏,南京,210016 |
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| 摘 要： | 对航空发动机焊接式整体叶盘结构,用损伤力学理论研究焊接接头低周疲劳损伤演化规律,以带内变量的热力学为基础,根据低周疲劳损伤特性及耦合的应变等价原理,建立了焊接低周疲劳损伤演变模型。用控制应变的疲劳试验,对航空发动机中常用的TC4钛合金焊接试件进行了疲劳损伤的测量,验证了损伤演变模型。模型中的参数具有明确的物理意义,且容易测量。研究结果对航空发动机焊接式整体叶盘寿命预测有参考价值。
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| 关 键 词： | 航空、航天推进系统 损伤模型 焊接结构 低周疲劳 |
| 文章编号： | 1000-8055(2003)02-0206-05 |
| 收稿时间： | 2002/5/28 0:00:00 |
| 修稿时间： | 2002年5月28日 |
A Research of Fatigue Damage Evolution of TC4 Alloy Welded Joint |
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| Institution: | Nanjing University of Aeronautics and Astronautics,Nanjing210016,China;Nanjing University of Aeronautics and Astronautics,Nanjing210016,China;Nanjing University of Aeronautics and Astronautics,Nanjing210016,China;Nanjing University of Aeronautics and Astronautics,Nanjing210016,China |
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| Abstract: | In this paper,the damage evolution law of low cycle fatigue (LCF) of welded blisk is studied,to which the damage mechanics theory is applied.The LCF damage evolution model is built on the basis of strap in variable thermodynamics,the LCF damage characteristics and the coupled strain equivalence principle with damage.The damage of welded specimens is measured in the strain controlled LCF experiment of titanium alloy (TC4) which is often used in aero engine and the damage evolution model is verified.The parameters in this model have definite physical meaning and are easy to be measured.The research results are of reference value for the life predication of the welded blisk of aero engine. |
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| Keywords: | aerospace propulsion low cycle fatigue fatigue damage model welded structure |
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