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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >STRESS SEPARATION IN DIGITAL PHOTOELASTICITY PART A-PHOTOELASTIC DATA UNWRAPPING AND SMOOTHING
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STRESS SEPARATION IN DIGITAL PHOTOELASTICITY PART A-PHOTOELASTIC DATA UNWRAPPING AND SMOOTHING

机译：数字光弹性中的应力分离A部分-光弹性数据展开和平滑

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The advent of digital photoelasticity saw the development of various techniques to get photoelastic data of isoclinics and isochromatics at every pixel in the domain. Unlike in other interferometric techniques, in photoelasticity one gets phase data of two quantities and their mutual dependence and interaction affect their evaluation. For stress separation studies, one requires both isochromatics and isoclinics accurately free of any kinks in the domain. With this in view, a robust approach is evolved to get these parameters. Initially wrapped isoclinics are obtained using a plane polariscope based phase shifting technique. These are unwrapped by a quality guided approach. However, the result has several kinks due to isochromatic-iso-clinic interaction. An outlier smoothing algorithm is proposed for getting a smooth variation of the isoclinics. Six-step phase shifting method using a circular polariscope is used for determining the isochromatic data. The smoothed isoclinic values obtained are used in isochromatic calculation to get isochromatic phasemap free of ambiguities. This phasemap is also unwrapped by a quality guided approach and smoothed by the outlier algorithm. These methodologies are validated for two benchmark problems of a disk under diametral compression and a ring subjected to internal pressure. The models are subjected to moderate loads showing a high level of isochromatic-isoclinic interaction.
机译：数字光弹性的出现见证了各种技术的发展，这些技术可以在域中的每个像素处获取等斜度和等色度的光弹性数据。与其他干涉技术不同的是，在光弹性中，人们获得两个量的相位数据，并且它们的相互依赖性和相互作用影响其评估。对于应力分离研究，人们需要等色体和等斜线都准确无域中的任何扭结。考虑到这一点，发展了一种鲁棒的方法来获得这些参数。使用基于平面偏振镜的相移技术可获得最初包裹的等斜线。这些都是通过质量指导的方法来包装的。然而，由于等色-等时相互作用，结果有一些纽结。为了获得等斜线的平滑变化，提出了一种离群平滑算法。使用圆偏振镜的六步相移方法确定等色数据。获得的平滑等斜度值用于等色度计算，以获得没有歧义的等色度相位图。该相位图还可以通过质量指导方法进行解包，并通过离群算法进行平滑处理。这些方法论针对碟盘在径向压缩下和环在内部压力下的两个基准问题进行了验证。模型承受中等载荷，表现出较高的等色-等斜相互作用。

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