Projection-Based Measurement and Identification
A recently developed Projection-based Digital Image Correlation (P-DVC) method is here extended to 4D (space and time) displacement field measurement and mechanical identification based on a single radiograph per loading step instead of volumes as in standard DVC methods. Two levels of data reductions are exploited, namely, reduction of the data acquisition (and time) by a factor of 1000 and reduction of the solution space by exploiting model reduction techniques. The analysis of a complete tensile elastoplastic test composed of 127 loading steps performed in 6 min is presented. The 4D displacement field as well as the elastoplastic constitutive law are identified.
KeywordsImage-based identification Model reduction Fast 4D identification In-situ tomography measurements
This work has benefited from the support of the French “Agence Nationale de la Recherche” through the “Investissements d’avenir” Program under the reference ANR-10-EQPX-37 MATMECA, and ANR-14-CE07-0034-02 COMINSIDE.