Numerical study of rusk checking during storage
Résumé
Checking is a recurring problem in the dry cereal products industry which involves hydromechanical and thermomechanical phenomena. This study focuses on the hydromechanical problem at constant temperature. The objective is to develop a model giving access to stress and the resulting strain fields in a rusk undergoing moisture equilibration during a 7‐day storage period in closed packaging to understand how checking occurs. A model was developed and implemented with Comsol Multiphysics. The effect of cells and the shape of the rusk on the stress field is investigated. Set‐ups were designed to determine the model parameters. Simulations showed that the rusks undergo shrinkage caused by moisture equilibration. Stresses reached maximal values around the cells of the matrix. The stress field varied significantly with the shape of the rusk.