The theory predicts experimental results with a macroscopic cantilever sheet as well as numerical simulations by the finite element method. We develop a theory that describes the stiffness of curved thin sheets with simple equations in terms of the longitudinal and transversal curvatures. The coupling between the internal stresses and the bending moments can increase the stiffness of the plate by several times. We here demonstrate by using simple geometric arguments that thin sheets subject to two-dimensional bending necessarily develop internal stresses. Simple experiments with a cantilever sheet made of paper show that the cantilever stiffness largely increases with small amounts of transversal curvature. This assumption, however, goes against intuition. Within the framework of classical thin plate theory, the stiffness of thin sheets is independent of its bending state for small deflections. The results show that the equivalent stress fluctuation of the part is small, and the flat ridge process is relatively stable.Curved thin sheets are ubiquitously found in nature and manmade structures from macro- to nanoscale. Based on the EDEM/FEM coupling algorithm, the strength of the ribbon spiral blade is checked. The simulation is performed under this parameter, and the stress results of the belt-shaped spiral blades subjected to soil particles in the simulation process are derived. Under different operating parameters, EDEM software is used to simulate the ridge leveling process, and the optimal working parameter combination of the ridge leveling device is obtained. The discrete element method is used to establish the soil model of the ridge structure, the soil particle contact model is selected and the simulation parameters are set. Aiming at the problems of tractor walking difficulty, large tillage resistance, poor flatness, and poor tillage depth consistency caused by the current greenhouse ridge cultivation planting mode in North China during rotary tillage operations, a four-head spiral machete and spiral blade combination were designed.

Keywords: Flat ridge EDEM/FEM Discrete element Coupling.Ībstract. Joseph, Michigan Citation: 2021 ASABE Annual International Virtual Meeting 2101176.(doi:10.13031/aim.202101176)Īuthors: Hua Yang Liu, Jinggang Yi, Xiao Hui Feng, Qiao Yongchang Published by the American Society of Agricultural and Biological Engineers, St. Simulation of ridge leveling process based on EDEM/FEM coupling algorithm

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Flat to fem results