A generalized DGS method for studying the deformation field around a crack tip
A generalized DGS method for studying the deformation field around a crack tip
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研究裂纹尖端周围变形场的通用 DGS 方法
DOI：
10.1016/j.optlaseng.2015.11.003
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发表时间：
2016-04
影响因子：
4.6
通讯作者：
Cheng Heming
中科院分区：
文献类型：
--
作者：
Zhang Rui;Guo Ran;Cheng Heming
本文提出了一种由光线角偏转计算应力强度因子的通用方法。该方法是基于二维数字图像相关（DIC）来测量光线的角偏转，然而，当一个试样受到加载，DIC的变形测量是不完美的，因为存在小的面内和面外的运动发生后加载的测试样品表面。这些缺点将导致测量的角偏转和断裂参数的误差。讨论了不可避免的面内运动和离面运动的影响，提出了一种消除面内运动和离面运动的方法，以显示聚甲基丙烯酸甲酯（PMMA）裂纹尖端的纯应力梯度。同时计算了应力强度因子的断裂参数。实验的光线的角偏转进行了比较，通过广义模型预测的裂纹尖端区域周围的阵列中的数据点的理论角偏转。为了显示该方法的潜力和有效性，K值从PMMA三点弯曲试样进行测试期间的实验数据中获得。结果表明，与有限元预测的K值的协议，突出了所提出的方法的潜力。
A generalized method for calculating the stress intensity factor from angular deflection of light rays is proposed. The method is based on 2D digital image correlation (DIC) to measure angular deflection of light rays, however, when a specimen is subjected to loading, deformation measurement from DIC is not perfect because of the existence of small in-plane and out-of-plane motions of the test sample surface that occurred after loading. These disadvantages will lead to errors in the measured angular deflections and fracture parameters. The influence of unavoidable in-plane and out-of-plane motions is discussed, and a generalized method to eliminate them to show the pure stress gradient of the crack tip of Polymethyl Methacrylate (PMMA) is demonstrated. At the same time, the fracture parameter of stress intensity was calculated. The experimental angular deflection of light rays was compared with the theoretical angular deflection predicted by generalized model using data points in an array around the crack tip region. To show the potential and efficacy of the method,Kvalues were obtained from experimental data during tests conducted in a PMMA three-point-bend specimen. Results show an excellent level of agreement withKvalues predicted from FEM, highlighting the potential of the proposed methodology.
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影响因子：
3.8
作者：
Qinwei Ma;Shaopeng Ma
通讯作者：
Qinwei Ma;Shaopeng Ma
影响因子：
2.4
作者：
B. Pan;Liping Yu;Dafang Wu
通讯作者：
B. Pan;Liping Yu;Dafang Wu
影响因子：
2.4
作者：
Periasamy, C.;Tippur, H. V.
通讯作者：
Tippur, H. V.
使用逆边界法结合 DGS 和有限元进行应力分析。
DOI：
10.1364/ao.53.008350
发表时间：
2014-12
期刊：
Appl Opt
影响因子：
--
作者：
Zhang, Rui;Guo, Ran;Cheng, Heming
通讯作者：
Cheng, Heming
两种改进的相干梯度传感方法用于反射表面的斜率测量
影响因子：
2.4
作者：
Ma Kang;Xie Huimin;Zhu Jianguo
通讯作者：
Zhu Jianguo