A New Computer Tracking Method for Crack Tip Propagation

2011 Fourth International Conference on Information and Computing Pub Date : 2011-04-25 DOI:10.1109/ICIC.2011.23

Wei Wang, Xiaoyuan He

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Abstract

According to the COD (crack opening displacement) criterion of elasticity-plasticity fracture mechanics, we can decide whether the structures including crack are safe or not. However, the theory basis of the COD criterion, which is Dugdale model, is not agree with the fact crackle. In order to research the displacement field around the fact crack tip, tracking the location of crack tip is very important. So, a new computer tracking method is provided to track the crack tip and measure the movement curve of the crack peak. Because the crack opens slowly, the similary between the front and back images of crack tip propagation is high. The computer tracking method based on the optimum image correlation algorithm is feasible. By the tracking experiment of the samples of thin paper and lumber block including the premade crack under the action of gradual loadings, the crack tip is successfully tracked. And the moving curve of the crack tip is also obtained. In this way, the computer tracking method provides a new dynamic experiment means to quantitatively analyze the stress-strain fields around the crack tip according to the images of displacement fields around the crack peak at the next work.

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裂纹尖端扩展的一种新的计算机跟踪方法

根据弹塑性断裂力学中的裂纹张开位移(COD)准则，可以判断含裂纹结构是否安全。然而，COD判据的理论基础是Dugdale模型，这与裂纹的实际情况并不相符。为了研究裂纹尖端周围的位移场，跟踪裂纹尖端的位置是非常重要的。为此，提出了一种新的计算机跟踪方法来跟踪裂纹尖端和测量裂纹峰值的运动曲线。由于裂纹扩展缓慢，裂纹尖端扩展的前后图像相似度较高。基于最优图像相关算法的计算机跟踪方法是可行的。通过对含预制裂纹的薄纸和木块试样在渐变加载作用下的跟踪实验，成功地跟踪了裂纹尖端。得到了裂纹尖端的运动曲线。这样，计算机跟踪方法提供了一种新的动态实验手段，可以根据下一步工作中裂纹峰值周围的位移场图像，定量分析裂纹尖端周围的应力应变场。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 Fourth International Conference on Information and Computing

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