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Image Analysis for QC/QA of Geotextile Deformation during Wide Width Tensile Testing



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Geosynthetics 2007 January 2007 Washington D C Image Analysis for QC QA of Geotextile Deformation during Wide Width Tensile Testing by Ahmet H Aydilek1 M Emin Kutay2 Members ASCE Rita Sparacino1 and Hiruy Dafla1 Abstract A laboratory testing program was undertaken to evaluate the feasibility of using digital image analysis technique to track deformation of geosynthetics during tensile testing The techniques developed in this study offer great potential to identify localized deformations in geosynthetics The technique can be used in understanding the grip efficiency quality control of manufactured products or determination of boundary conditions in geosynthetics under tensile loads which may further be used in development of constitutive models Introduction and Experimental Program Geosynthetics are expected to offer certain mechanical properties that will provide satisfactory performance when exposed to field conditions Among various properties strength is one of the most important ones in reinforcement applications and wide width tensile test is commonly used to determine strength Koerner 1997 Primarily the stress strain behavior and strength properties determined from this test are defined at a particular strain or elongation level and strains are usually calculated on average basis for the entire specimen The accurate determination of the deformation therefore strain zones is necessary particularly for quality control quality assurance QC QA evaluation of these materials Due to limitations in the current test methodologies these zones usually remain undetected in the wide with tensile testing which results in incomplete characterization of mechanical performance There are various methods used to measure strains i e extensometers strain gages laser beam and infrared sensors but with certain shortcomings as they cannot accurately define complete strain fields Disruption of yarns or filaments on a geotextile by use of extensometers and strain gages is common while



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