Compression set and cupping of painted wooden panels

Joseph Gril (1, 2) , Delphine Jullien (1, 2) , David Hunt (3)

1 LMGC - Laboratoire de Mécanique et Génie Civil
2 BOIS - Bois
3 GESAAF - Department of Agricultural, Food and ForestrySystem

Factors that need to be considered to explain the observed cupping pattern of panel paintings are reviewed. The anisotropic shrinkage and the action of the paint layer, both a reinforcement and a moisture barrier are the most obvious ones, but the progressive contraction of ancient wood is usually invoked. Although the aging process of wood could be responsible for some of it, several mechanical processes may lead to compression set: mechano-sorption, microbuckling, or even the recovery of locked-in growth strains.

Mots clés: wood; compression set; painted panel

Domaines: Matériaux; Mécanique des matériaux [physics.class-ph]

Joseph Gril, Delphine Jullien, David Hunt. Compression set and cupping of painted wooden panels. Analysis and Characterisation of Wooden Cultural Heritage by Scientific Engineering Methods, Apr 2016, Halle (Saale), Germany. ⟨hal-01452161⟩