12th International Congress on the Deterioration and Conservation of Stone. Columbia University in the City of New York Date: 22-26 October 2012.
Numerical study of the stability of restoring damaged Sculpture
Laura Michel 1,2, Duc Phi Do 1, Dashnor Hoxha 1, Benoit Coignard 3, Xavier Brunetaud 2, Muzahim Al Mukhtar 2
1 Laboratoire PRISME, Polytech’Orléans, 8 rue Léonard de Vinci, 45072 Orléans
2 Centre de Recherche sur la Matière Divisée, 1b rue de la Férollerie, 45071 Orléans
3LaboSculpt, 18 rue du Mur, 28100 Dreux
Abstract
Actors working on the preservation and restoration of the cultural heritage use more and more efficient tool for restoration design and execution. In the last few decades, the development of modern digital tools for structural analysis offers new strategies and opportunities for this community. (Borri 2006; Coignard 2009)
Numerical analysis of structures could be used as an associated method in the field of cultural heritage conservation. In the present work, mechanical 3D simulations were used to, a posteriori, evaluate the restoration technique performed on a Roman marble sculpture, the Neptune statue. This artwork founded during underwater excavations of the Rhône River in 2006 was broken into four pieces. The restorer (Coignard 2009) used a laser scanner for geometry acquisition of sculpture blocks. The resulting cloud-points were then introduced in CAO for the virtual reconstruction and a first evaluation of stability using a simplified static analysis.
The same cloud-points and model geometry are used for the methodology developed where the 3D mesh assembled is used as an input for mechanical simulation software.
Thanks to numerical techniques used, the damaged sculpture can be reconstructed, assembled and the efficiency of alternative reinforcing techniques can be evaluated.
Our first results depict the key role of interfaces in the overall behavior of the assembled sculpture. Experimental studies on the actual behavior of fractures in blocks of statue’s material allowed us to calibrate our model. Some parametric studies on the tie rod prestressed force and contact interfaces parameters show the influence of these elements on the final stability of the statue.
Keywords: restored sculpture, static analysis, numerical modeling, interface, mechanical behavior
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