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双反射镜成像用于二维数字图像相关应变精度提升

Enhancement of Strain Measurement Accuracy of Two-Dimensional Digital Image Correlation Based on Dual-Reflector Imaging

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摘要

受离面刚体位移的影响,普通二维数字图像相关(DIC)方法测得的应变结果往往精度较差。基于双45°双反射镜成像技术,提出了一种改进的二维DIC方法来提高应变测量精度。利用双反射镜成像,将试样正反面散斑图案记录到同一张图像中,对左右图像中对应点的应变取平均值,可自动消除试样离面刚体位移的影响,获得准确的全场应变。开展了两组拉伸实验来验证该方法的可行性。实验结果表明:对于均匀变形,由改进的二维DIC方法得到的双向应变与电测法的结果相吻合;对于非均匀变形,得到的结果与有限元法结果相一致。因此,本文提出的二维DIC方法具有较高的应变测量精度,是一种便捷、有效、高精度的应变测量方法。

Abstract

Strain results obtained using common two-dimensional digital image correlation (2D-DIC) method usually have rather poor measurement accuracy owing to rigid out-of-plane displacement. This study proposes a modified 2D-DIC method based on 45° dual-reflector imaging technique to improve the strain measurement accuracy. The speckle patterns of the front and rear surfaces can be recorded in a single image using dual-reflector imaging. The effect of rigid out-of-plane displacement is automatically eliminated by taking the average strain of corresponding points from the left and right images. Two groups of tensile tests are conducted to verify the feasibility of the proposed 2D-DIC method. Experimental results show that: for uniform deformation, the biaxial results obtained using the proposed 2D-DIC method are in good agreement with those obtained using strain gauges; from the viewpoint of the nonuniform deformation, the strain fields of the proposed 2D-DIC method are in agreement with those of the finite element method. Therefore, the proposed 2D-DIC method has excellent strain measurement accuracy, and it is a convenient, effective, and highly accurate strain measurement method.

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DOI:

所属栏目:仪器,测量与计量

基金项目:国家自然科学基金、中央高校基本科研业务费专项资金;

收稿日期:2019-07-04

修改稿日期:2019-08-08

网络出版日期:2019-12-01

作者单位    点击查看

朱飞鹏:河海大学力学与材料学院, 江苏 南京 211100
陆润之:河海大学力学与材料学院, 江苏 南京 211100
白鹏翔:河海大学力学与材料学院, 江苏 南京 211100
雷冬:河海大学力学与材料学院, 江苏 南京 211100

联系人作者:朱飞鹏(zhufeipeng@hhu.edu.cn)

备注:国家自然科学基金、中央高校基本科研业务费专项资金;

【1】Sun P Y, Zhu Z K, Su C Y, et al. Experimental characterisation of mechanical behaviour for a TA2 welded joint using digital image correlation [J]. Optics and Lasers in Engineering. 2019, 115: 161-171.

【2】Zhu F P, Gong Y, Bai P X, et al. Determination of tensile stress-strain curve of brittle materials based on two-dimensional digital image correlation [J]. Journal of Experimental Mechanics. 2018, 33(3): 333-342.
朱飞鹏, 龚琰, 白鹏翔, 等. 基于二维DIC的脆性材料拉伸应力—应变曲线测定 [J]. 实验力学. 2018, 33(3): 333-342.

【3】Chen Z N, Shao X X, Wu J L, et al. Full-field deformation measurement of human carotid artery based on water transfer printing speckle patterns [J]. Acta Optica Sinica. 2017, 37(3): 0312004.
陈振宁, 邵新星, 吴家林, 等. 水转印数字散斑场用于人体颈动脉全场测量 [J]. 光学学报. 2017, 37(3): 0312004.

【4】Ge P X, Ye P, Li G H. Application of digital image correlation method based on genetic algorithm in micro-displacement measurement [J]. Acta Optica Sinica. 2018, 38(6): 0612006.
葛朋祥, 叶沛, 李桂华. 基于遗传算法的数字图像相关法在微位移测量中的应用 [J]. 光学学报. 2018, 38(6): 0612006.

【5】Pan B, Tian L。 Advanced video extensometer for non-contact, real-time, high-accuracy strain measurement [J]。 Optics Express。 2016, 24(17): 19082-19093。

【6】Wu R, Kong C, Li K, et al。 Real-time digital image correlation for dynamic strain measurement [J]。 Experimental Mechanics。 2016, 56(5): 833-843。

【7】Sutton M A, Yan J H, Tiwari V, et al。 The effect of out-of-plane motion on 2D and 3D digital image correlation measurements [J]。 Optics and Lasers in Engineering。 2008, 46(10): 746-757。

【8】Dai X L, Xie H M, Wang H X. Analysis of the error caused by off-plane displacement in two-dimensional digital image correlation measurement [J]. Journal of Experimental Mechanics. 2013, 28(1): 10-19.
戴相录, 谢惠民, 王怀喜. 二维数字图像相关测量中离面位移引起的误差分析 [J]. 实验力学. 2013, 28(1): 10-19.

【9】Hoult N A, Andy Take W, Lee C, et al。 Experimental accuracy of two dimensional strain measurements using digital image correlation [J]。 Engineering Structures。 2013, 46: 718-726。

【10】Bai P X, Zhu F P, He X Y. Optical extensometer and elimination of the effect of out-of-plane motions [J]. Optics and Lasers in Engineering. 2015, 65: 28-37.

【11】Pan B, Yu L P, Wu D F. High-accuracy 2D digital image correlation measurements using low-cost imaging lenses: implementation of a generalized compensation method [J]. Measurement Science and Technology. 2014, 25(2): 025001.

【12】Wang Z, Fang F, Liu B, et al. An experimental method for eliminating effect of rigid out-of-plane motion on 2D-DIC [J]. Optics and Lasers in Engineering. 2015, 73: 137-142.

【13】Zhu F P, Bai P X, Shi H J, et al. Enhancement of strain measurement accuracy using optical extensometer by application of dual-reflector imaging [J]. Measurement Science and Technology. 2016, 27(6): 065007.

【14】Zhu F P, Gong Y, Bai P X, et al. Study on strain measurement accuracy of optical extensometers based on digital image correlation [J]. Optics and Precision Engineering. 2018, 26(5): 1061-1069.
朱飞鹏, 龚琰, 白鹏翔, 等. 基于数字图像相关的光学引伸计应变测量精度研究 [J]. 光学精密工程. 2018, 26(5): 1061-1069.

【15】Dong B, Tian L, Pan B。 Tensile testing of carbon fiber multifilament using an advanced video extensometer assisted by dual-reflector imaging [J]。 Measurement。 2019, 138: 325-331。

【16】Pan B, Xie H M, Guo Z Q, et al。 Full-field strain measurement using a two-dimensional Savitzky-Golay digital differentiator in digital image correlation [J]。 Optical Engineering。 2007, 46(3): 033601。

引用该论文

Zhu Feipeng,Lu Runzhi,Bai Pengxiang,Lei Dong。 Enhancement of Strain Measurement Accuracy of Two-Dimensional Digital Image Correlation Based on Dual-Reflector Imaging[J]。 Acta Optica Sinica, 2019, 39(12): 1212002

朱飞鹏,陆润之,白鹏翔,雷冬. 双反射镜成像用于二维数字图像相关应变精度提升[J]. 光学学报, 2019, 39(12): 1212002

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