Numerical modeling of the tensile strength of a biological granular aggregate: Effect of the particle size distribution

Abstract : Wheat grains can be considered as a natural cemented granular material. They are milled under high forces to produce food products such as flour. The major part of the grain is the so-called starchy endosperm. It contains stiff starch granules, which show a multi-modal size distribution, and a softer protein matrix that surrounds the granules. Experimental milling studies and numerical simulations are going hand in hand to better understand the fragmentation behavior of this biological material and to improve milling performance. We present a numerical study of the effect of granule size distribution on the strength of such a cemented granular material. Samples of bi-modal starch granule size distribution were created and submitted to uniaxial tension, using a peridynamics method. We show that, when compared to the effects of starch-protein interface adhesion and voids, the granule size distribution has a limited effect on the samples’ yield stress.
Type de document :
Communication dans un congrès
International workshop on Powders and Grains, Jul 2017, Montpellier, France. 2017
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https://hal.archives-ouvertes.fr/hal-01539472
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Soumis le : mercredi 14 juin 2017 - 20:44:40
Dernière modification le : jeudi 28 juin 2018 - 11:06:55

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  • HAL Id : hal-01539472, version 1
  • PRODINRA : 396387

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Karsta Heinze, Xavier Frank, Valerie Lullien-Pellerin, Matthieu George, Farhang Radjai, et al.. Numerical modeling of the tensile strength of a biological granular aggregate: Effect of the particle size distribution. International workshop on Powders and Grains, Jul 2017, Montpellier, France. 2017. 〈hal-01539472〉

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