基于环绕测点子区分割的数字图像相关方法剪切带宽度测量研究

doi:10.3969/j.issn.1000-1158.2022.01.07

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摘要提出了一种致力于改善狭窄、高应变梯度剪切带宽度测量精度的数字图像相关方法。通过对测点的原始子区的有限分割,使后代子区环绕在测点周围,以使一些后代子区位于简单变形区域,进而以最佳后代子区的结果作为测点结果。通过对比提出方法和粗-细方法的虚拟剪切带宽度测量结果,验证了提出方法的有效性,并从理论上分析了剪切带宽度测量误差。研究表明:对于虚拟剪切带,在理论上,提出方法的剪切带宽度不受子区尺寸的影响;与粗-细方法相比,受子区尺寸的影响较小,而受测点间隔的影响较大,但测量结果更准确。

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	张博闻
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关键词 ：计量学, 剪切带宽度, 数字图像相关方法, 子区尺寸, 子区分割, 粗-细方法

Abstract：To accurately measure widths of narrow shear bands with high strain gradients, a new digital image correlation method was proposed based on the subset splitting . Through splitting the original subset of the monitored point, and making splitted subsets surround the point, a few splitted subsets were in simple deformational regions. Results of the best correlated subsets were taken as results of the point. The validity of the proposed method was verified by comparing measured fictitious shear band widths of the proposed method and the coarse-fine method, and shear band width measurement errors of two methods were analyzed in theory. It is shown that the measured fictitious shear band widths of the proposed method are not influenced by the subset size in theory. Measured shear band widths of the proposed method are less influenced by the subset size and more influenced by the monitored point spacing than of the coarse-fine method. Measured shear band widths of the proposed method are more accurate than of the coarse-fine method.

Key words： metrology shear band width digital image correlation method subset size subset splitting coarse-fine method

收稿日期: 2020-03-16 发布日期: 2022-01-06

PACS:	TB931
	O348.1

基金资助:国家自然科学基金项目(51874162)

通讯作者: 王学滨(1975-),男,黑龙江双鸭山人,辽宁工程技术大学教授,博士生导师,主要从事岩土材料的变形、破坏及稳定性研究。Email: wxbbb@263.net E-mail: wxbbb@263.net

作者简介: 张博闻(1993-),男,山东费县人,辽宁工程技术大学在读硕士研究生,研究方向为光测力学。Email: zhangbw19@qq.com

引用本文:

张博闻, 王学滨, 董伟. 基于环绕测点子区分割的数字图像相关方法剪切带宽度测量研究[J]. 计量学报, 2022, 43(1): 40-47.
ZHANG Bo-wen, WANG Xue-bin, DONG Wei. Measurement of Shear Band Widths Based on the Digital Image Correlation Method Considering Splitted Subsets Surrounding the Monitored Point. Acta Metrologica Sinica, 2022, 43(1): 40-47.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2022.01.07 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2022/V43/I1/40

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