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首页> 外文会议>Annual International DIC Society Conference >Experimental Study of Measurement Errors in 3D-DIC Due to Out-of-Plane Specimen Rotation
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Experimental Study of Measurement Errors in 3D-DIC Due to Out-of-Plane Specimen Rotation

机译：由于平面外标本旋转，3D-DIC测量误差的实验研究

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摘要

In practice, out-of-plane motions usually are not avoidable during experiments. Since 2D-DIC measurements are vulnerable to parasitic deformations due to out of plane specimen motions, three-dimensional digital image correlation (3D-DIC) oftentimes is employed. The 3D-DIC method is known to be capable of accurate deformation measurements for specimens subjected to general three-dimensional motions, including out of plane rotations and displacements. As a result, there has been limited study of the deformation measurements obtained when using 3D-DIC to measure the displacement and strain fields for a specimen subjected only to out-of-plane rotation. This paper presents experimental results regarding the effect of out-of-plane rotation on strain measurement using 3D-DIC. Specifically, full-field deformation results are obtained during rigid body, out-of-plane rotation in the range -40°≤ θ ≤ 40° using a two-camera stereovision system. Results indicate that (a) the measured normal strain in the foreshortened direction increases in a non-linear manner with rotation angle, (b) the normal strain along the direction of the rotation axis is essentially zero for all rotation angles and (c) the in-plane shear strain is small but increases linearly with rotation angle. Results also indicate that the magnitude of the errors in the strain are a strong function of how the calibration process is performed, with measurement errors exceeding ±1400 με for what would normally be considered "small angle" calibration processes.
机译：在实践中，在实验期间通常不可避免平面外运动。由于2D-DIC测量由于平面样本运动而易受寄生变形，因此采用三维数字图像相关（3D-DIC）。已知3D-DIC方法能够精确地对经过一般三维运动的试样进行准确的变形测量​​，包括超出平面旋转和位移。结果，在使用3D-DIC时获得的变形测量​​的研究已经有限研究，用于测量仅经受平面外旋转的样本的位移和应变场。本文介绍了关于使用3D-DIC对平面外旋转对应变测量的影响的实验结果。具体地，在刚体期间获得全场变形结果，使用双摄像头立体系统在-40°≤θ≤40°的平面外旋转。结果表明（a）缩进方向上的测量正常应变以旋转角度的非线性方式增加，（b）沿旋转轴线的常规应变基本上为所有旋转角度和（c）面内剪切应变很小，但随着旋转角度线性增加。结果还表明，应变中的误差的幅度是如何执行校准过程的强功能，测量误差超过±1400με，对于通常被认为是“小角度”校准过程。

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