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This article is closed access.A hygromechanical model has been developed to simulate the in-service behaviour of\udthe natural lacquer urushi, using a phenomenological description of viscoelasticity. The\udmaterial and mechanical properties were determined as a function of the relative humidity\ud(RH), and the relationship between RH and moisture content was determined. These\udproperties served as inputs to a finite-element-based model that was then tested against\udexperimental measurements of the depth-averaged stresses in a thin layer of urushi\uddeposited on a substrate and exposed to changes in the environmental conditions. Good\udagreement was seen between the predicted and measured behaviour. The validated model\udwas used to investigate the spatial and temperature variation of stress in urushi films\udsubjected to cyclic environmental conditioning

Modelling the mechanical response of urushi lacquer subject to a change in relative humidity