Residual Stresses in Dried Bodies

Abstract

The problem of residual stresses in porous materials as a result of drying and the presumable influence of these stresses on the swelling effect by rehydration are discussed. The drying model comprising the specific mechanisms suitable for the first and second periods of drying is applied, and the numerical algorithm enabling calculation of the drying-induced stresses is constructed. The numerical calculations exemplifying the history of stresses leading finally to the residual stresses are carried out. The outcome of these stresses on the swelling strains during rehydration is illustrated using an example of a finite dimensions kaolin cylinder dried convectively.

Keywords:

• Convective drying
• Modeling
• Numerical calculation
• Rehydration
• Residual stresses

ACKNOWLEDGEMENT

This work was carried out as a part of the research project No. 3 T09C 030 28 sponsored by the Ministry of Science and Education of Poland.