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Evaluation of the significance of the contact model particle parameters in the modelling of wet soils by the discrete element method
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2021-10-19 , DOI: 10.1016/j.still.2021.105228
Salavat Mudarisov 1 , Ildar Farkhutdinov 1 , Rim Khamaletdinov 1 , Eduard Khasanov 1 , Airat Mukhametdinov 1
Affiliation  

Modelling of the tillage process by working tools based on the method of discrete elements is currently the most promising. The results of modelling the processing process obtained by the method of discrete elements adequately describe the behaviour of the soil. Due to the large number of physical and mechanical parameters included in the description of contact models of discrete elements, the calibration process takes a lot of time. Thus, we set a research goal - to evaluate the significance of the parameters of the contact model particles in soil modelling by the discrete element method and to obtain nomograms for selecting the parameters of the Hertz-Mindlin contact model particles depending on the humidity of various types of soils. The article presents the results of calibration of the physical and mechanical parameters of the particles of the soil medium model described by the discrete element method. An improved Hertz-Mindlin JKR model was used as a contact model, the model was implemented in the Rocky DEM programme. The following properties of the modelled particles are taken as the studied factors – Poisson's ratio, static and dynamic friction coefficients, Jung's modulus, surface energy, and particle diameter. The detection of the natural slope angle of the soil was carried out for black soils of clay, light loam and sandy loam mechanical composition. The calibration was performed according to the angle of the natural slope. Comparison of the simulation results with field experiments of typical soils made it possible to establish that the nature of the change in the angle of the natural slope of the simulated soil environment is significantly affected by the surface energy and the diameter of the particles. The obtained dependences of the angle of natural slope on soil moisture and surface energy allow determining the parameters for the Hertz-Mindlin contact model as a function of humidity for Black soil zones of clay, light loam and sandy loam mechanical composition. Based on the results of field and model experiments, a nomogram was obtained that makes it possible to select parameters for the contact model - the diameter of soil particles and the value of surface energy depending on humidity and soil type. The obtained values of the parameters of the particles of the soil medium make it possible to simulate the process of tillage, optimize the design and technical parameters of the newly created working parts of tillage machines.



中文翻译:

用离散元法评价接触模型颗粒参数在湿土建模中的重要性

基于离散元方法的工作工具耕作过程建模是目前最有前途的。通过离散元方法获得的处理过程建模结果充分描述了土壤的行为。由于离散元件接触模型的描述中包含大量物理和机械参数,校准过程需要大量时间。因此,我们设定了一个研究目标——通过离散元法评估接触模型粒子参数在土壤建模中的重要性,并获得用于根据各种湿度选择赫兹-明德林接触模型粒子参数的列线图。土壤类型。本文介绍了离散元法描述的土壤介质模型中颗粒物理力学参数的标定结果。改进的 Hertz-Mindlin JKR 模型用作接触模型,该模型在 Rocky DEM 程序中实施。模型粒子的以下特性被作为研究因素——泊松比、静摩擦系数和动摩擦系数、荣格模量、表面能和粒子直径。对粘土、轻壤土和砂壤土力学成分的黑土进行了土壤自然坡度角的检测。根据自然坡度的角度进行校准。将模拟结果与典型土壤的现场实验进行比较,可以确定模拟土壤环境的自然坡度角度变化的性质受表面能和颗粒直径的显着影响。获得的自然坡度角对土壤水分和表面能的依赖性允许确定 Hertz-Mindlin 接触模型的参数,作为粘土、轻质壤土和砂壤土机械成分的黑土区湿度的函数。根据现场和模型实验的结果,获得了一个列线图,可以为接触模型选择参数 - 土壤颗粒的直径和表面能值取决于湿度和土壤类型。

更新日期:2021-10-20
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