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AbstractAbstractCradle-related effects, such as 'washboarding' and tented flaking, were investigated by computer-aided moiré fringe analysis of panel models subjected to cycled changes in relative humidity. In-plane and out-of-plane displacements were recorded and compared for cradled and unreinforced panel models. These results were related to the behaviour of actual cradled panel paintings. Results indicate that restraint of warping increases in-plane strain due to swelling, and the strain distribution is in close correspondence with cradle restraint. Compressive strain, recorded over the fixed battens, and out-of-plane distortions in the exposed panel areas are discussed in relation to deformations and damages in cradled panel paintings.
Brewer et al. (Wed,) studied this question.