Journal
MEASUREMENT
Volume 133, Issue -, Pages 456-467Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2018.10.049
Keywords
Concrete; Strain localization; Uniaxial compression; X-ray micro computed tomography; Digital volumetric speckle photography; Digital volume correlation
Funding
- National Natural Science Foundation of China [51727807, 51374211, 51874309]
- State Key Research Development Program of China [2016YFC0600705]
- Fundamental Research Funds for the Central Universities of China [2009QM02]
- Laboratory for Experimental Mechanics Research in the Department of Mechanical Engineering at Stony Brook University
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The fracture process for concrete materials under compression is a complex three-dimensional phenomenon that occurs as a result of material heterogeneity and complicated mixed-mode cracking mechanisms. To understand the failure mechanism of concrete, it is necessary to have a technique that can probe the interior of the material as it is being loaded. In this paper, we use an industrial computed tomography (CT) system to obtain the volumetric image of a concrete circular cylinder under compression by taking advantage of the ability of X-rays to penetrate opaque materials. In addition, we employ a newly developed 3D strain analysis technique called digital volumetric speckle photography (DVSP) to calculate the displacement and strain distribution in two longitudinal meridian sections and a midpoint transverse section of the specimen. We are able to reveal the regions of strain localization and their evolutions, which eventually lead to the failure of the specimen. (C) 2018 Elsevier Ltd. All rights reserved.
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