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

Author:

Liu X.1,Wildman R. D.2,Ashcroft I. A.2,Elmahdy A. E.1,Ruiz P. D.1

Affiliation:

1. School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK

2. Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

Abstract

A hygromechanical model has been developed to simulate the in-service behaviour of the natural lacquer urushi , using a phenomenological description of viscoelasticity. The material and mechanical properties were determined as a function of the relative humidity (RH), and the relationship between RH and moisture content was determined. These properties served as inputs to a finite-element-based model that was then tested against experimental measurements of the depth-averaged stresses in a thin layer of urushi deposited on a substrate and exposed to changes in the environmental conditions. Good agreement was seen between the predicted and measured behaviour. The validated model was used to investigate the spatial and temperature variation of stress in urushi films subjected to cyclic environmental conditioning.

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

Reference25 articles.

1. Generation and relief of stress in ceramic films;Atkinson A.;Br. Ceramic Proc.,1997

2. Conservation of the Mazarin Chest: structural response of Japanese lacquer to variations in relative humidity;Bratasz L.;In ICOM-CC triennial meeting,2008

3. Stress measurement in East Asian lacquer thin films owing to changes in relative humidity using phase-shifting interferometry

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