3D Discrete Element Model to Describe the Draft Force and the Influences of the Tool Geometry

Abstract

Virtual DEM models were developed in correspondence with the real tests. In this article we will introduce the methods of how DEM approach was used in developing a model for the prediction of draught force on cultivator sweeps. The micro structure of soil is very complex and the conventional approach to explore the mechanical behavior of soil mainly relies on experimental shearing tests under laboratory conditions. The implementation of DEM is carried out by a series of numerical triaxial tests on granular assemblies with varying confining pressures and bond conditions. The results demonstrate that the numerical simulations can produce correct responses of the soil behavior in general, including the critical state response, as compared to experimental observations using the Mohr circles. The influences of cultivator sweep geometry was researched by DEM in 3D and were correlated with the soil bin tests results.

Virtualni DEM modeli su bili razvijani uporedo sa realnim testiranjem. U ovom radu ćemo predstaviti metode pristupa DEM u razvoju modela za predviđanje vučne sile na krilima kultivatorske motičice. Mikro struktura zemljišta je veoma kompleksna, a konvencionalni pristup istraživanju mehaničkog ponašanja zemljišta većinom se oslanja na eksperimentalne testove u laboratorijskim uslovima. Primena DEM je izvedena serijama numeričkih triaksialnih testova na granularnim podlogama sa različitim pritiscima i uslovima u bazenu. Rezultati pokazuju da numeričke simulacije generalno mogu korektno da predvide ponašanje zemljišta, uključujući reakciju na kritično stanje, u poređenju sa eksperimentalnim istraživanjima upotrebom Mohr krugova. Uticaji geometrija krila kultivatorske motičice su istraživani upotrebom DEM u 3D i poređeni sa rezultatima testova u zemljišnom bazenu.