Estimation of Crack Mouth Opening Displacement in Concrete Using Optical Fiber Sensors
Received Date: Oct 29, 2017 / Accepted Date: Dec 11, 2017 / Published Date: Feb 15, 2018
Concrete is a multi-phase composite material and used widely in construction industry because of high compressive strength and low cost. Its limited tensile strength makes it prone to cracking. Important parameters like characteristic length, fracture energy Gf critical crack width WC are used to understand cracks in concrete. The crack width is estimated either as crack mouth opening displacement (CMOD/COD) or as crack tip opening displacement (CTOD). Several optical and non-optical methods can provide information about crack presence but do not provide information on crack opening and crack width which are important from considerations of durability. To this end we present our research results in three point bend tests on pre-notched concrete samples (M-20 composition) using (a) Intensity based plastic optic fiber (POF) using phase difference measurement method (b) Fiber Bragg grating (FBG) method. The CMOD estimation and relative sensitivity of these methods will be presented.
Keywords: Crack mouth opening displacement; Three point bend specimens; UTM; FBGs; Plastic optical fiber; Phase difference method; Prenotched concrete
Citation: Sobha B, Samrajyam K, Sai Prasad RLN, Rao GTD (2018) Estimation of Crack Mouth Opening Displacement in Concrete Using Optical Fiber Sensors. Optom Open Access 3: 126. Doi: 10.4172/2476-2075.1000126
Copyright: © 2018 Sobha B, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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