Speckling Soft Materials Using an Airbrush Attachment for Digital Image Correlation Experiments
Date
2020-12
Authors
Hansen, Sarah
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Bentil, Sarah
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Abstract
The method used to produce speckle patterns, on soft biological tissue and soft material surfaces, is crucial to the success of three-dimensional (3D) Digital Image Correlation (DIC) experiments. DIC is a non-contact optical technique for obtaining the full deformation field of a specimen, due to an applied load. The speckle size, shape, contrast against the specimen's background, and unique pattern are all parameters that influence the accuracy of the displacement measurements. An airbrush, with a 3D printed nozzle attachment, is applied to generate repeatable speckles for DIC experiments. This research determined the feasibility of using this airbrush attachment as a means to speckle soft biological tissue, for improving the results following DIC analysis. Attachments are printed and used to speckle the surface of porcine brain tissue. The tissue is then subjected to unconfined compression experiments utilizing a rheometer while DIC analysis is applied to quantify the tissue’s surface deformation. Preliminary experiments determine the testing parameters. A MATLAB code is developed to quantitatively analyze the speckle patterns and provide researchers with data to determine the quality of a speckle pattern. The results of this work will benefit researchers using DIC to characterize the mechanical behavior of soft biological tissue or biomaterials.
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