| 随机荷载作用下疲劳裂纹扩展新算法 |
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| 引用本文： | 谷利雄,许忠勇,刘智芳.随机荷载作用下疲劳裂纹扩展新算法[J].科学技术与工程,2009,9(8). |
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| 作者姓名： | 谷利雄 许忠勇 刘智芳 |
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| 作者单位： | 华南理工大学土木与交通学院桥梁与隧道工程系,广州,510640 |
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| 摘 要： | 认为疲劳裂纹扩展的机理是惯性效应,并在断裂力学的基础上,通过引入惯性效应因子导出等幅荷载作用下疲劳裂纹扩展速率解析表达式.将随机载荷用通用的傅立叶变换转换为等幅非对称循环载荷的叠加,这一方法具有力学概念清晰、简便的特点.通过与试验数据和其它方法的对比研究,证明了该方法的有效性.成功地将等幅载荷作用下疲劳裂纹扩展新公式推广到随机载荷作用.
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| 关 键 词： | 随机载荷 等幅载荷 疲劳裂纹扩展速率 断裂力学 惯性效应因子 傅立叶变换 |
Novel Arithmetic of Fatigue Crack Growth under Random Loading |
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| GU Li-xiong,XU Zhong-yong,LIU Zhi-fang.Novel Arithmetic of Fatigue Crack Growth under Random Loading[J].Science Technology and Engineering,2009,9(8). |
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| Authors: | GU Li-xiong XU Zhong-yong LIU Zhi-fang |
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| Institution: | South China University of Technology;Guangzhou 510640;P.R.China |
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| Abstract: | According to the basic mechanics theory,the mechanism of fatigue crack growth is an inertial effect,and A formula of the fatigue crack growth rate under constant amplitude loading by importing an inertia effect coefficient on the basis of fracture mechanics is analytically deduced.Based on above research,the random loading spectrum is converted into the superposition of a series of asymmetrical cyclic constant amplitude loads by applying Fourier transformation.This method has clear mechanical concepts and c... |
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| Keywords: | random loading constant amplitude loading fatigue crack growth rate fracture mechanics inertia effect coefficient fourier transformation |
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