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| 一种基于能量参数的非局部缺口疲劳寿命预测方法 |
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袁善虎1,2,蒋洪德1,2,陈海燕2,3,刘丙权2,3
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(1. 清华大学 热能工程系，北京 100084;2. 燃汽轮机与煤气化联合循环国家工程研究中心，北京 100084;3. 北京华清燃气轮机与煤气化联合循环工程技术有限公司，北京 100084)
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| 摘要: |
| 为了考虑应力集中对构件疲劳寿命的影响，采用能量参数作为疲劳损伤评估参量，发展了一种基于能量的非局部缺口疲劳寿命预测方法，该方法通过相同寿命条件下缺口试样与光滑试样的疲劳损伤等效关系确定用于定义缺口试样非局部临界体积的能量参数门槛值，并建立了能量参数门槛值与疲劳寿命的关系，进而通过迭代程序便可进行缺口试样寿命预测。试验验证结果表明:缺口试样能量参数门槛值与疲劳寿命在双对数坐标系下呈线性关系；所发展的方法对缺口疲劳试验试样的寿命预测精度较高，预测寿命分散带在2倍以内。 |
| 关键词: 缺口影响 疲劳寿命 疲劳损伤 能量参数 非局部方法 |
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| 基金项目:中国博士后科学基金资助项目(2015M581112)。 |
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| Non-Local Method for Notched Fatigue Life Estimation Based on Energy Parameter |
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YUAN Shan-hu1,2,JIANG Hong-de1,2,CHEN Hai-yan2,3,LIU Bing-quan2,3
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(1. Department of Thermal Engineering，Tsinghua University，Beijing 100084，China;2. National Research Center of Gas Turbine and IGCC Technology，Beijing 100084，China;3. Beijing Huatsing Gas Turbine & IGCC Technology Co.，Ltd，Beijing 100084，China)
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| Abstract: |
| In order to take account of the effects of stress concentration on the fatigue life，non-local method for notched fatigue life estimation based on energy parameter，in which energy parameter has been used to evaluate fatigue damage，was developed. The energy parameter threshold value used to define non-local critical volume was determined based on the equivalent relationship of fatigue damage of a smooth specimen and a notched specimen under the same fatigue life condition. The relationship between energy parameter threshold value and fatigue life was established. Furthermore，the fatigue life of notched specimens could be calculated by recursive procedure. The results based on fatigue experiments of smooth and notched specimens show that: it presents a linear relationship between energy parameter threshold value and fatigue life in double logarithmic scale，and the fatigue life prediction of notched specimens give good estimation with a scatter band of less than 2. |
| Key words: Notch effect Fatigue life Fatigue damage Energy parameter Non-local method |
