Numerical Simulation of Uprooting of Cassava Root

Abstract

Based on the methods including modified Mohr-Coulomb yield criterion, Lagrange and smoothed particle hydrodynamics (SPH), the cassava stem - root - soil system dynamics simulation model is established by ANSYS/ LS-DYNA. The interaction mechanisms between uprooted cassava root and soil are discovered. The processes of soil shearing and the changing processes of root's stress are analyzed. The studies show that (1) the effects of root being extruded on the soil expand gradually from inside to outside in the process of uprooting, and the uprooted force reaches the maximum value when the soil appears ring shear rupture; (2) after the uprooted force reaches the maximum value, the root's effective stress still increases gradually with the increasing of its bending deformation until the soil is separated,and root's maximum effective stress appears in the combination of the root and stem where is the most easily to be broken;(3)when the maximum uprooted force on cassava root is analyzed, the interaction of a disc and its extension on the soil is regarded as the mechanical model of maximum uprooted force on cassava root.

Contact forces and motion behavior of non‐Newtonian fluid–solid food by coupled SPH–FEM method

“…Among them, the solidification algorithm applied to the interior of the same object, such as the impact problem in which the impact point region of the target plate was discretized as SPH particles, and the rest was discretized as finite elements (Figure S1a). The contact algorithm was applicable between different objects, such as the fluid-solid coupling problem in which the fluid food was discretized as SPH particles, and solid food was discretized as finite elements (Figure S1b) (Yang, Cai, et al, 2012;. The conversion algorithm was suitable for cases where the location and extent of large deformations are unknown, such as the crack extension problem, where the computational domain was initially discretized into finite units, and the finite units in the crack extension direction were converted into SPH particles (Figure S1c).…”