3-D strain estimation in sandstone using improved digital volumetric speckle photography algorithm

Accurately and stably estimating the strain in rocks is important to understand their failure mechanism. Digital volumetric speckle photography (DVSP) combined with X-ray computed tomography (CT) has been used to investigate the strain in rocks. This study introduced the inverse compositional Gauss–...

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Bibliographic Details
Published in:International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 141; p. 104736
Main Authors: Mao, Lingtao, Liu, Haizhou, Wang, Yuwei, Ding, Leilei, Ju, Yang, Chiang, Fu-Pen
Format: Journal Article
Language:English
Published: Berlin Elsevier Ltd 01.05.2021
Elsevier BV
Subjects:
Algorithms
Computed tomography
Digital volume correlation
Digital volumetric speckle photography
Failure mechanisms
Indentation
Interior deformation
Inverse compositional Gauss–Newton algorithm
Photography
Rock
Rocks
Sandstone
Strain analysis
X-ray computed tomography
Interior deformation
Digital volume correlation
Rock
Digital volumetric speckle photography
X-ray computed tomography
Inverse compositional Gauss–Newton algorithm
ISSN:1365-1609, 1873-4545
Online Access:Get full text
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Summary:Accurately and stably estimating the strain in rocks is important to understand their failure mechanism. Digital volumetric speckle photography (DVSP) combined with X-ray computed tomography (CT) has been used to investigate the strain in rocks. This study introduced the inverse compositional Gauss–Newton algorithm into DVSP to improve the accuracy and precision of displacement and strain measurements. Granules with different particle sizes were used to simulate the mesostructure of sandstone, and a series of baseline experiments were conducted to evaluate the accuracy of the improved algorithm, which had a performance that was approximately three times better than DVSP alone. Subsequently, the algorithm was applied to red sandstone subjected to the Brazilian test and an indentation experiment. The interior deformation characteristics of the specimen were clearly depicted, which clarified the failure mechanism of the rock material.
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ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2021.104736