APPLICATIONS OF DIGITAL-IMAGE-CORRELATION TECHNIQUES TO EXPERIMENTAL MECHANICS
APPLICATIONS OF DIGITAL-IMAGE-CORRELATION TECHNIQUES TO EXPERIMENTAL MECHANICS
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DOI：
10.1007/bf02325092
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发表时间：
1985-01-01
影响因子：
2.4
通讯作者：
PETERS, WH
中科院分区：
文献类型：
--
作者：
CHU, TC;RANSON, WF;PETERS, WH
宏观参数的光学测量，如应变和位移，已经发展成为实验应力分析的一个公认的分支。全息术、散斑干涉术、散斑照相术、剪切散斑干涉术、白光散斑、莫尔条纹等已从基础研究阶段发展成为分析各种工程问题的成熟方法。然而，所有这些技术都受到两个主要限制。首先，它们具有不同的稳定性要求。所有干涉测量方法都有严格的稳定性要求，这限制了它们在大多数情况下对研究环境的适用性。散斑照相、莫尔条纹和白光散斑技术的要求比干涉测量技术的要求低，更适合于工业应用。其次，对于上述每种方法，减少条纹图案并由此获得所需数据所需的数据处理是费力和耗时的。然而，许多研究人员已经认识到这一困难，并开发了计算机程序来简化数据还原过程。MendenhalP~开发了一个完全自动化的过程，以计算等和线和等差线条纹图，计算条纹数，确定部分条纹值，并最终输出恒定主应力值的轮廓。最近，有人提出了一种计算表面应变和位移的完全自动化方法，后来又用来确定悬臂梁的中心线位移。3本文介绍的工作概述了（a）变形和数字相关的基本理论，以及它们如何结合起来形成测量技术，（B）用于扩展测量范围的插值方法和（c）已经进行的四个实验
Optical measurements of macroscopic parameters, such as strain and displacement, have evolved into an accepted branch of experimental stress analysis. Topics such as holographyJ, 2 speckle interferometry, 3 speckle photography/-6 speckle-shearing interferometry/white-light speckle s and moir~ 9'~~ have advanced from the basic research stage into mature methods employed to analyze a variety of engineering problems. However, all of these techniques suffer from two major limitations. First, they have varying stability requirements. All interferometric methods have stringent stability requirements which limit their applicability to research environments for most cases. Speckle photography, moirg and white-light speckle have less stringent requirements than those for interferometric techniques, and are more adaptable to industrial applications. Secondly, the data processing required to reduce the fringe patterns and thereby obtain the desired data is laborious and time consuming for each method noted above. However, many researchers have recognized this difficulty and have developed computerized procedures to simplify the datareduction process. MendenhalP~ developed a completely automated process to digitize both isopachic and isochromatic fringe patterns, compute fringe numbers, determine partial fringe values and finally output profiles of constant principal-stress values. More recently, a completely automated approach for the computation of surface strains and displacements was proposed'and later employed to determine the centerline displacements of a cantilever beam.~ 3 The work presented here outlines (a) the basic theory of deformation and digital correlation, as well as how they are combined to form the measurement technique,(b) the interpolation methods employed to extend the range of the measurements and (c) four experiments that have been performed