High Performance Digital Volume Correlation
We develop an Improved 3D digital volume correlatiion (DVC) technique to measure displacement and strain fields throughout the interior of a material. Our eventual goal is to perform DVC with resolution comparable to that achieved in @D DIC, with a correlation time that is commensurate with the image acquisition time .this would represent a significant improvement one the Current state-of the art available in the literature. Using an X-ray micro-CT scanner, we can resolve features at the 5 micron scale ,genarating 3D images with up ti=o 8 billion voxels. We compute twevle Degrees -of- freedom at each Generating #D images with up to * billion voxels. We compute twelve degrees-of -freedom at each correlation point and utilize tricubic spline interpolation to achieve high accuracy- For DVC the volume of data,number of Correlation points and work to solve each correlation point grow cubically. We therefore employ parallel computing to handle this tremendous increase in computational and memory requirements .We demonstrable the application of DVC using an artificial deformation of actuall PDMS samples with empedded particles forming an internal Pattern.
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