| 朱飞鹏*,陶金,顾剑,白鹏翔,雷冬.基于双平行相机的高精度光学引伸计及标距矫正[J].实验力学,2022,37(2):191~198 |
| 基于双平行相机的高精度光学引伸计及标距矫正 |
| High accuracy optical extensometer and gauge length correction based on two parallel cameras |
| 投稿时间：2021-05-06 修订日期：2021-06-03 |
| DOI：10.7520/1001-4888-21-110 |
| 中文关键词: 数字图像相关 双平行相机 光学引伸计 标距矫正 应变测量精度 |
| 英文关键词:digital image correlation gauge length correction optical extensometer two parallel cameras strain measurement accuracy |
| 基金项目:国家自然科学基金 (12172120)；中央高校基本科研业务费专项资金(B210202095)资助 |
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| 中文摘要: |
| 受离面位移的影响，基于二维数字图像相关(2D-DIC)光学引伸计的应变精度往往较差。针对这一问题，本文提出了基于双平行相机与2D-DIC的高精度光学引伸计方法。该方法在测量过程中不需要采取补偿方法，既简化了操作，也减小了离面位移对应变测量精度的影响。利用该引伸计开展了不锈钢和铸铁试样的单轴拉伸实验，来验证方法的可行性，并采用标距矫正的方法对实验结果进行修正。实验结果表明，本文提出的双平行相机光学引伸计方法及标距矫正方法具有优异的测量效果，相较于普通光学引伸计以及三维数字图像相关(3D-DIC)方法，都具有较高的应变测量精度。 |
| 英文摘要: |
| Due to the effect of out-of-plane displacement, the optical extensometer based on two-dimensional digital image correlation (2D-DIC) often gives rather poor strain measurement accuracy. Regarding this problem, a high accuracy optical extensometer based on two parallel cameras and 2D-DIC was proposed. The method not only simplifies the experimental operation but also reduces the effect of out-of-plane displacement on the strain measurement accuracy, and any compensation method is not needed in the measurement process. Moreover, the method of gauge length correction was adopted to improve the experimental results. The uniaxial tensile tests of stainless steel and cast iron specimens were conducted to evaluate the performance of the proposed method. The experimental results show that the proposed optical extensometer and gauge length correction method have good performance, and both of them have higher strain measurement accuracy compared with the common optical extensometer and 3D-DIC method. |
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