Simultaneous assessment of Lagrangian strain and temperature fields by improved IR-DIC strategy

Simultaneous assessment of Lagrangian strain and temperature fields by improved IR-DIC strategy
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通过改进的 IR-DIC 策略同时评估​​拉格朗日应变和温度场

DOI:
10.1016/j.optlaseng.2017.02.012
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发表时间:
2017-07
影响因子:
4.6
通讯作者:
C. Jiang
C. Jiang
中科院分区:
工程技术2区
文献类型:
--
作者:
X.G. Wang;C.H. Liu;C. Jiang

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提出了一种基于红外成像的数字图像相关方法(IR-DIC),实现了拉格朗日应变场和温度场的同时测量。在IR-DIC中的一个主要困难是在变形期间的热场的演变,这是在图像相关性中意想不到的。提出了两种解决方案来解决这个困难。第一种方法是利用高通滤波器消除热信号的变化部分,第二种方法是采用一种先进的度量-互信息作为相关准则。这两种方法都是通过对缺口试样进行拉伸试验来验证的。位移场和应变场的估计表明,以及所提出的方法的理想性能。由于运动场评估,所获得的温度场可以在拉格朗日坐标系中描述,因此可以有效地跟踪变形过程中材料点的温度演化。
This paper focuses on the development of a novel digital image correlation strategy based on infrared imaging (IR-DIC) for realizing simultaneous assessment of Lagrangian strain and temperature fields. A major difficulty in the IR-DIC is the evolution of the thermal field during deformation that is unexpected in the image correlation. Two solutions are proposed to tackle this difficulty. The first solution is to utilize a high-pass filter to eliminate the variation part of the thermal signal, and the second solution is to employ an advanced metric, the mutual information, as the correlation criterion. Both methods are verified through a tensile test performed on a notched specimen. The estimated displacement and strain fields demonstrate well the desirable performance of the proposed methods. Thanks to the kinematic field assessment, the obtained thermal fields can be described in the Lagrangian coordinate system, thus the temperature evolution of the material points during deformation can be followed effectively.
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