| 金属材料疲劳裂纹扩展曲线的拟合方法研究 |
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| 引用本文： | 田秀云, 杜洪增, 孙智强. 金属材料疲劳裂纹扩展曲线的拟合方法研究[J]. 工程力学, 2003, 20(4): 136-140. |
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| 作者姓名： | 田秀云 杜洪增 孙智强 |
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| 作者单位： | 中国民用航空学院机电系,天津,300300;中国民用航空学院机电系,天津,300300;中国民用航空学院机电系,天津,300300 |
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| 摘 要： | 提出了一种金属材料疲劳裂纹扩展曲线(a～N曲线)的拟合方法,即修正的双曲函数拟合方法。为检验这种曲线拟合方法的适用性,利用2024-T42铝合金CCT试样的疲劳裂纹扩展试验数据,对该铝合金的疲劳裂纹扩展曲线进行了拟合分析,并给出了疲劳裂纹扩展速率和扩展寿命。通过疲劳裂纹扩展寿命计算结果和试验结果的对比分析,证明这种拟合方法具有较高的拟合精度。
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| 关 键 词： | 疲劳裂纹扩展 曲线拟合 裂纹扩展寿命 双曲函数 |
| 文章编号： | 1000-4750(2003)04-0136-05 |
| 收稿时间： | 2002-02-27 |
| 修稿时间： | 2002-07-28 |
CURVE FITTING OF THE FATIGUE CRACK GROWTH CHARACTERRISTIC OF METALS |
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| TIAN Xiu-yun, DU Hong-zeng, SUN Zhi-qiang. CURVE FITTING OF THE FATIGUE CRACK GROWTH CHARACTERRISTIC OF METALS[J]. Engineering Mechanics, 2003, 20(4): 136-140. |
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| Authors: | TIAN Xiu-yun DU Hong-zeng SUN Zhi-qiang |
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| Affiliation: | Civil Aviation University of China, Tianjin 300300, China |
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| Abstract: | In this paper, a new curve fitting approach to the fatigue crack growth characteristic of metals is developed, in which modified hyperbolic functions are employed. Based on the of fatigue crack growth testing data of 2024-T42 aluminum alloy, a curve fitting analysis of the fatigue crack growth characteristic is conducted and the fatigue crack growth rate and the fatigue life are given. Compared with experimental data, the results of the present curve fitting approach are shown to be accurate. |
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| Keywords: | fatigue crack growth curve fitting crack growth life hyperbolic function |
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