Study on several problems of automatic full-field isoclinic parameter measurement by digital phase shifting photoelasticity

Study on several problems of automatic full-field isoclinic parameter measurement by digital phase shifting photoelasticity
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数字相移光弹自动全场等斜参数测量若干问题研究

DOI:
10.1016/j.ijleo.2015.05.053
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发表时间:
2015-10
期刊:
影响因子:
3.1
通讯作者:
Xiaojing Yang
Xiaojing Yang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
尚伟;Xinhua Ji;Xiaojing Yang

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由光弹性条纹图确定等倾参数是光弹性力学中的一个关键问题。然而,由于等色参数的影响,这不是一个简单的任务。本文的目的是利用六步数字移相光弹技术实现全场等倾参数的自动测量。然而,等倾参数的取值范围、等倾-等差线的相互作用以及自由角点、奇点和各向同性点等特殊点的影响等问题是研究的关键。通过对这些问题的分析,提出了一种自动获取全场等倾参数的算法,并通过仿真和实验进行了验证。该方法简单、有效地解决了等倾-等色线相互作用和特殊点附近等倾参数误差问题。
The determination of isoclinic parameter from photoelastic fringe patterns is a key problem in photoelasticity. However, it is not a simple task due to the influence of the isochromatic parameter. The purpose of this paper is to achieve the full-field isoclinic parameter measurement automatically by six-step digital phase shifting photoelasticity. However, there are several key problems, such as the range of the isoclinic parameter, the isoclinic–isochromatic interaction, and the influence of special points such as free corner point, singular point and isotropic point. Through analyzing these problems, we present an appropriate algorithm to get the correct full-field isoclinic parameter automatically which is validated by simulation and experiment. This method is simple and effective to solve the problems of the isoclinic–isochromatic interaction and the isoclinic parameter error around the special points.
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