Full-field based measurements and local mechanical properties identification

Full-field based measurements and local mechanical properties identification

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Imaging technology and numerical techniques have allowed for tracking of fields of deformation data by numerical comparison of images taken at different stages of mechanical testing. As opposed to classical global measurements of load and displacement, image correlation technology gives greater insight, for example, into the mechanisms for failure, especially in composite materials.
This same full-field data, can be a rich source of information for inverse techniques that estimate the local material properties within the area of observation. These maps of material properties are important for feeding forward models that predict structural behavior under different conditions. Current research is focusing on the development of identification techniques that are robust to input measurement noise and that can efficiently process 3-dimensional full-field data.
COHMAS lab is developing tools for image correlation specifically designed for complex microstructures. A novel identification method has been developed for estimation of material properties using full-field measurements that is capable of processing large volumes of 3D data from correlation of images taken during in-situ testing in a tomograph.