A Strain-Gauge-Based Method for the Compensation of Out-of-Plane Motions in 2D Digital Image Correlation

IF 1.9 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Mathematical & Computational Applications Pub Date : 2023-03-10 DOI:10.3390/mca28020040

Carl-Hein Visser, G. Venter, M. Neaves

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引用次数: 0

Abstract

When performing a digital image correlation (DIC) measurement, multi-camera stereo-DIC is generally preferred over single-camera 2D-DIC. Unlike 2D-DIC, stereo-DIC is able to minimise the in-plane strain error that results from out-of-plane motion. This makes 2D-DIC a less viable alternative for strain measurements than stereo-DIC, despite being less financially and computationally expensive. This work, therefore, proposes a strain-gauge-based method for the compensation of errors from out-of-plane motion in 2D-DIC strain measurements on planar specimens. The method was first developed using equations for the theoretical strain error from out-of-plane motions in 2D-DIC and was then applied experimentally in tensile tests to two different dog-bone specimen geometries. The compensation method resulted in a clear reduction in the strain error in 2D-DIC. The strain-gauge-based method thus improves the accuracy of a 2D-DIC measurement, making it a more viable option for performing full-field strain measurements and providing a possible alternative in cases where stereo-DIC is not practical or is unavailable.

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一种基于应变计的二维数字图像相关平面外运动补偿方法

当执行数字图像相关（DIC）测量时，多摄像机立体DIC通常比单摄像机2D-DIC更可取。与2D-DIC不同，立体DIC能够最大限度地减少平面外运动引起的平面内应变误差。这使得2D-DIC成为比立体DIC更不可行的应变测量替代方案，尽管在财务和计算上成本较低。因此，这项工作提出了一种基于应变仪的方法，用于补偿平面试样2D-DIC应变测量中平面外运动的误差。该方法首先是使用2D-DIC平面外运动的理论应变误差方程开发的，然后在两种不同的狗骨样品几何形状的拉伸试验中进行了实验应用。该补偿方法明显降低了2D-DIC中的应变误差。因此，基于应变仪的方法提高了2D-DIC测量的准确性，使其成为执行全场应变测量的更可行的选择，并在立体声DIC不实用或不可用的情况下提供了可能的替代方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mathematical & Computational Applications MATHEMATICS, INTERDISCIPLINARY APPLICATIONS-

自引率

10.50%

发文量

审稿时长

12 weeks

期刊介绍： Mathematical and Computational Applications (MCA) is devoted to original research in the field of engineering, natural sciences or social sciences where mathematical and/or computational techniques are necessary for solving specific problems. The aim of the journal is to provide a medium by which a wide range of experience can be exchanged among researchers from diverse fields such as engineering (electrical, mechanical, civil, industrial, aeronautical, nuclear etc.), natural sciences (physics, mathematics, chemistry, biology etc.) or social sciences (administrative sciences, economics, political sciences etc.). The papers may be theoretical where mathematics is used in a nontrivial way or computational or combination of both. Each paper submitted will be reviewed and only papers of highest quality that contain original ideas and research will be published. Papers containing only experimental techniques and abstract mathematics without any sign of application are discouraged.