| 光弹断裂分析数据拟合程序的改进 |
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| 引用本文： | 许立明.光弹断裂分析数据拟合程序的改进[J].北京交通大学学报(自然科学版),1989(2). |
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| 作者姓名： | 许立明 |
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| 作者单位： | 北方交通大学工程力学研究所 |
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| 摘 要： | 作者建议了一种选取初值的原则,并尝试用几种不同的阻尼最小二乘算法来替代在以前的光弹断裂分析数据拟合程序中所用的高斯-牛顿算法,发现一种改进的阻尼最小二乘算法最为合理.文中用这种新的算法编写的程序分析了几个动光弹实验结果,其中包括动态曲裂和枝裂实验结果.
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| 关 键 词： | 断裂 动光弹 |
Improvement of the Photoelastic Fracture Analysis Software |
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| Xu Liming.Improvement of the Photoelastic Fracture Analysis Software[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,1989(2). |
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| Authors: | Xu Liming |
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| Institution: | Institute of Engineering Mechanics |
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| Abstract: | A rule for selecting initial estimates is suggested.Several kinds of procedures based on damping least-square methods were attempted to modify the previous one. A new algorithm called modified damping least-square method was found more suitable.With the new data reduction procedure,several sets of data of dynamic photoelastie fracture experiments,including dynamic crack branching and curving, were analyzed.The effect of third orders terms on the determination of dynamic stress intensity factor from isochromatics near a moving crack was also discussed. |
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| Keywords: | fracture dynamic photoelastic |
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