PREDICTION OF THE YOUNG MODULUS OF THE EARTH REINFORCED BY THE STRAW

Optimization and precise knowledge of the effective properties of heterogeneous materials requires the use of predictive homogenization techniques. The aim of this work is to test numerical models of homogenization with a view to predicting the elastic properties of the clay-rice straw composite. Experimental values from the literature have been compared to that from the digital models Digimat MF and Digimat FE. Note that the Digimat MF semi-analytical model gives values closer to the experimental ones. This is confirmed by the reliability study of the two models which was carried out. Indeed, up to a volume fraction value of 25%, the ratio of the values predicted by the MF model to the experimental ones are closer to unity than those obtained by the FE model. We then deduce that the MF model is more reliable in predicting the elastic moduli of the rice straw clay composite. It was also highlighted the decrease in Young's modulus as a function of the increase in the volume fraction of rice straws. This remark is made on all models.