Follow-up of a panel restoration procedure through image correlation and finite element modeling
Résumé
Conservation of paintings of Cultural Heritage on wood panels could gain from using tools of wood science and structural mechanics. Indeed, with a virtual model, prediction of an artwork behavior for various scenarii could help for decision on conservation or restoration acts. Since each artwork is a particular case, it requires an identification step to nurture the model. In this article, we are concerned with a particular restoration act: the partial replacement of a cradle. This study couples an experimental approach (3D stereo-correlation) and a numerical approach (finite elements). The experimental part concerns an optical non-invasive form measurement with digital image correlation, using a projected speckle pattern on the painted panel, with luminance compensation. The numerical part concerns stress evaluation, once the model and the experiments are compared using a geometric mapping and a spatial projection of discrete fields. Using modeling and identification, the simulation attempts to recover the residual stresses in the panel, and allows testing several restoration conditions.