| 确定总应变寿命方程中指数的一种方法 |
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| 引用本文： | 刘香,王延荣,田爱梅.确定总应变寿命方程中指数的一种方法[J].航空动力学报,2017,32(1):105-113. |
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| 作者姓名： | 刘香 王延荣 田爱梅 |
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| 作者单位： | 1.北京航空航天大学 能源与动力工程学院，北京 100191；先进航空发动机协同创新中心，北京 100191 |
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| 基金项目： | 国家自然科学基金(51475022，50571004) |
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| 摘 要： | 在由材料的单调拉伸强度极限和断面收缩率确定总应变寿命方程中疲劳强度系数和疲劳延性系数的基础上，考查了利用材料在两个不同应力幅下的疲劳试验数据和单调拉伸延伸率来确定总应变寿命方程中疲劳强度指数和疲劳延性指数的一种方法，给出了只需较少的疲劳试验数据和单调拉伸力学性能参数即可确定材料的总应变寿命方程中全部4个参数的分析流程，并利用航空发动机中常用的钛合金和镍基合金材料的疲劳试验数据对该方法进行了验证，结果表明该方法所确定的总应变寿命方程对所考查的材料大多数情形的疲劳寿命预测结果较为理想，基本在3倍分散带以内.
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| 关 键 词： | 总应变寿命方程 疲劳强度系数 疲劳延性系数 疲劳强度指数 疲劳延性指数 寿命预测 |
| 收稿时间： | 2015/5/15 0:00:00 |
A method for determination of exponents in total strain life equation. |
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| LIU Xiang,WANG Yan-rong,TIAN Ai-mei.A method for determination of exponents in total strain life equation.[J].Journal of Aerospace Power,2017,32(1):105-113. |
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| Authors: | LIU Xiang WANG Yan-rong TIAN Ai-mei |
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| Abstract: | The fatigue strength coefficient and fatigue ductility coefficient in total strain life equation for a material can be determined by the monotonic tensile ultimate strength and percentage reduction of area of specimens. A method was investigated to determine the fatigue strength exponent and fatigue ductility exponent in total strain life equation by use of the monotonic tensile elongation and the fatigue test data under two different stress amplitudes. An analysis procedure was developed to determine all the four parameters in the total strain life equation according to a few fatigue test data and the monotonic tensile mechanical performance parameters. This method was verified by use of the fatigue test data of several titanium alloys and nickel based alloys commonly used in aero engine. The results indicate that the total strain life equation with its parameters obtained by use of the developed method can make a relatively accurate fatigue life prediction nearly within a scatter band of 3. |
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| Keywords: | total strain life equation fatigue strength coefficient fatigue ductility coefficient fatigue strength exponent fatigue ductility exponent life prediction |
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