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Shape Effects on Shear Behavior of Superdisk Systems Studied by Level Set Discrete Element Method

2024; Springer Nature; Linguagem: Inglês

10.1007/978-981-99-3826-1_30

2366-2557

Haoran Jiang, Reid Kawamoto, Takashi Matsushima,

Soil and Unsaturated Flow

This paper investigates the shear behavior of superdisk particles using the 2D level set discrete element method (LS-DEM). Specifically, dense samples of various superdisk shapes (blockiness $$n\in [2, 4]$$ ) were prepared through isotropic compression tests, and the prepared samples were then subjected to simple shear tests under different shearing speeds. We find the following. Firstly, it is observed that the final compression state is strongly influenced by the particle shapes. Larger surface blockiness leads to more ordered packing structures, resulting in higher solid fractions and mean coordination numbers in larger values of $$n$$ . Secondly, the quasi-static shear response shows significant differences for different values of $$n$$ . The stress ratios $$q/p$$ and solid fractions $$\phi $$ in the peak and critical state increase monotonically with all blockiness values explored. Finally, the study tests the constitutive rheological model of steady flows, and the findings indicate that $$\mu (I)$$ and $$\phi (I)$$ relations can be well captured by power-law functions for all samples. Furthermore, the fitted exponents are found to be nearly independent of the shape of the samples. The results of this study provide deeper insights into the particle shape effects on granular materials.