Journal
COMPOSITE STRUCTURES
Volume 134, Issue -, Pages 782-788Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.08.129
Keywords
Interior strain in composite; Digital volumetric speckle photography; Digital volume correlation; Digital speckle photography
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Funding
- ONR Solid Mechanics Program [N0014-14-1-0419]
- National Natural Science Foundation of China [51374211]
- National key foundation for exploring scientific instrument of China [2013YQ240803]
- Fundamental Research Funds for the Central Universities [2009QM02]
- Laboratory for Experimental Mechanic Research of the Department of Mechanical Engineering at Stony Brook University
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Materials such as fiber reinforced composite are inherently 3D in nature. Its internal stress/strain fields are very complex even under the simplest loading condition. There is no effective means of measuring interior strain other than placing isolated sensors. In this paper we introduce a new strain measuring technique called digital volumetric speckle photography whereby we can probe the interior strain field in a whole field manner. We apply it to the determination in a woven fiber composite beam under 3-point bend. The in-plane strain field of three transverse sections and two longitudinal sections are determined using the technique. In addition we show that one of the principal strain fields of the mid-longitudinal section tends to predict the impending failure of the beam. (C) 2015 Elsevier Ltd. All rights reserved.
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