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Communication Dans Un Congrès Année : 2019

Crack in rusks: modelling and simulation of stress and displacement fields

Résumé

Crack during storage is a recurrent problem in the dry cereal products industry (rusks, biscuits, crackers...). The aim of this work is to understand how mechanical stresses develop during storage. For this purpose, a model was developed with Comsol Multiphysics to visualize the changes of the water content and of the stress and displacement fields during one week of storage. The parameters required for the modelling are in particular the mass diffusivity, the hygrometric expansion coefficient, the Young's modulus and the Poisson's ratio of rusk. Specific measurement methods were developed to obtain these data such as a dilatation bench and observation of the material undergoing compression test. A first model was developed assuming an isotropic material. The results showed that the water content is almost equalized throughout the rusk over one week of storage. A second model including the presence of cells in the structure showed that the stresses tend to be higher around the cells. The rusk tends to shrink during storage with small strain. The calculated stress reach high values close to the rupture stress. As a conclusion, rusk breakage seems to be closely linked to the cellular structure of the crumb of the bread used to produce rusk. The mitigation of rusk crack requires a good control of the uniformity of the cellular structure of the crumb without large cells.
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Dates et versions

hal-02360324 , version 1 (12-11-2019)

Identifiants

  • HAL Id : hal-02360324 , version 1

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Jean-Yves Monteau, Luc Guihard, Alain Le Bail. Crack in rusks: modelling and simulation of stress and displacement fields. ICEF13, Sep 2019, Melbourne, Australia. ⟨hal-02360324⟩
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