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Study Of Displacements and Cracking In Composite Materials



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Image Processing Applications For The Study Of Displacements and Cracking In Composite Materials B Mobasher S D Rajan Department of Civil and Environmental Eng Arizona State Univ Tempe AZ USA Outline of Presentation Introduction Image processing using Matlab Image processing applications for cracks and displacement fields Case Studies Fabric composites for crack spacing Ring Specimen for crack width Calibration using tensile tests on rubber and fabrics Displacement measurement in Fan blade out test Conclusions Scope of Work Crack characteristicslength width and spacing 2 D Full field displacement measurement based on Cross correlation Approach White light illumination Not real time results Post Processing needed Tension test Samples and Ring static tests Sub pixel accuracy Image Processing Software Image Acquisition using a variety of frame grabbers and digital cameras Image Processing Toolbox in MATLAB Full flexibility for customization Economical versatile and use friendly interface A comprehensive library of canned routines for image processing Fabric Reinforcing Methodology Lamina stacking optimization for strength and toughness 60 50 Unidirectional Stress MPa 40 0 45 45 90 s 30 20 10 45 45 s 0 0 000 0 005 0 010 0 015 0 020 Strain mm mm 0 025 Various stages of cracking Image Definition The most convenient method for expressing locations in an image is to use pixel coordinates In this coordinate system the image is treated as a grid of discrete elements The intensity ranges from 0 1 for binary images 0 255 for grey images and three distinct levels of 0 255 for color images Image is represented as a matrix of scalar or logical variables i e 256x256 512x512 1028x1028 or 640x480 c 1 1 1 2 1 3 1 4 2 1 2 2 2 3 r 3 1 3 2 4 1 Binary Level processing Filters Dilation and Erosion Morphological Reconstruction Pixel Connectivity Flood Fill Operations Objects Regions Feature Measurement Properties of objects of Binary Images Processing Steps Image Capture Acquisition Grey



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