期刊
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
卷 3, 期 2, 页码 335-354出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1758825111001019
关键词
Digital volume correlation; soft materials; confocal microscopy; 3-D deformation measurements
类别
资金
- National Basic Research Program of China [2007CB935602, 2011CB809106]
- National Natural Science Foundation of China [10872008, 11002003, 11072004]
This paper develops a set of digital volume correlation (DVC) algorithms to address 3-D deformation measurements of soft gels with the aid of laser-scanning confocal microscopy. As an extension of the well-developed digital image correlation (DIC) method, the present DVC approach adopts a three-dimensional zero-normalized cross-correlation criterion (3-D ZNCC) to perform volume correlation calculations. Based on a 3-D sum-table scheme and the fast Fourier transform technique, a fast algorithm is first proposed to accelerate the integer-voxel correlation computations. Subsequently, two kinds of sub-voxel registration algorithms, i.e., 3-D gradient-based algorithm and 3-D Newton-Raphson algorithm, are presented to obtain the sub-voxel displacement and strain fields of volume images before and after deformation. Both a series of computer-simulated digital volume images and an actual agarose gel sample randomly embedded with fluorescent particles are employed to verify the 3-D deformation measurement capability of the proposed DVC algorithms, which indicates that they are competent to acquire 3-D displacement and strain fields of soft gels.
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