| 用数字图像相关法研究改性高分子材料的断裂行为 |
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| 引用本文： | 王冬梅,计宏伟.用数字图像相关法研究改性高分子材料的断裂行为[J].同济大学学报(自然科学版),1999,27(3):278-281. |
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| 作者姓名： | 王冬梅 计宏伟 |
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| 作者单位： | [1]同济大学工程力学与技术系 [2]天津大学力学与工程测试系 |
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| 摘 要： | 对数字图像相关测量方法进行了系统的研究，对相关迭代算法中的初值估计问题进行了分析研究，提出利用“实时相减”和“精密调节”相结合的办法来获得零初值，从而有效地解决了Ｎｅｗｔｏｎ－Ｒａｐｈｓｏｎ迭代算法中的初值估计问题，提高了迭代的收敛速度和精度；并首次将数字图像相关方法应用于改性高聚物的断裂行为研究。
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| 关 键 词： | 数字图像相关法 工程断裂 改性 高分子材料 |
Studies on Fracture Behaviors of the Modified High Polymer by Using Digital Image Correlation Method |
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| Wang Dongmei,Fang Ruhua.Studies on Fracture Behaviors of the Modified High Polymer by Using Digital Image Correlation Method[J].Journal of Tongji University(Natural Science),1999,27(3):278-281. |
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| Authors: | Wang Dongmei Fang Ruhua |
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| Abstract: | Digital-image correlation method(DICM) has been developed in this paper.The initial estimates of both displacement and displacements gradients for Newton-Raphson iteration are studied.The new method of initial estimates,a real time image subtraction scheme and a micro-motion compensation mechanism being used to take zero as initial estimates,is firstly presented and demonstrated.Some problems in the initial estimates and the convergence of Newton-Raphson iteration have been solved.The fracture behavior of PE composites are studied by using DICM. |
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| Keywords: | Digital-image correlation method Real-time subtraction J integral Stress-intensity factor Engineering fracture |
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