基于局部位移场最小二乘拟合数字图像相关方法的剪切带应变测量

doi:10.3969/j.issn.1000-1158.2019.04.18

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Abstract Strains in the fictitious shear band are measured by use of least-square fitting of local displacements of the digital image correlation method, and strains are compared with those obtained by use of the central difference method and the analytical solution. Effects of the size of the calculating window and the size of the subset are mainly demonstrated. It is found that when the calculating window is larger and the size of the subset is lower, strains are closer to the analytical solution. Strains during the failure process of the low liquid-limit clay specimen under uniaxial compression are measured by use of least-square fitting of local displacements method and the central difference method, and strains are measured by least-square fitting of local displacements method are more accurate, which is helpful for the accurate measurement of strains of shear bands.

Key words： metrology shear band strain least-square fitting digital image correlation method clay gradient-dependent plasticity

Received: 21 September 2017 Published: 10 June 2019

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TB931

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	Articles by authors
	WANG Xue-bin
	HOU Wen-teng
	DONG Wei
	YANG Mei
	CAO Si-wen

Cite this article:

WANG Xue-bin,HOU Wen-teng,DONG Wei, et al. Strain Measurements of Shear Bands Based on Least-square Fitting of Local Displacements Based on the Digital Image Correlation Method[J]. Acta Metrologica Sinica, 2019, 40(4): 655-661.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2019.04.18 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2019/V40/I4/655

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