Modeling and Parameter Selection of the Corn Straw–Soil Composite Model Based on the DEM

Tianyue Xu, Yan Gou, Dongyan Huang (), Jianqun Yu, Chunrong Li and Jingli Wang ()
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Tianyue Xu: College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, China
Yan Gou: College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, China
Dongyan Huang: College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, China
Jianqun Yu: College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China
Chunrong Li: College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, China
Jingli Wang: College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, China

Agriculture, 2024, vol. 14, issue 11, 1-18

Abstract: During corn harvesting operations, machine–straw–soil contact often occurs, but there is a lack of research related to the role of straw–soil contact. Therefore, in this study, a composite contact model of corn straw‒soil particles was established based on the discrete element method (DEM). First, the discrete element Hertz‒Mindlin method with bonding particle contact was used to establish a numerical model of the double-bonded bimodal distribution of corn straw, and bonding particle models of the outer skin‒outer skin, inner pulp‒inner pulp, and outer skin‒inner pulp were developed. The nonhomogeneous and deformable material properties were accurately expressed. The straw compression test combined with simulation calibration was used to determine some of the bonding contact parameters by means of the PB (Plackett–Burman) test, the steepest ascent test, and the BB (Box–Behnken) test. Additionally, Additionally, the Hertz-Mindlin with JKR (Johnson-Kendall-Roberts) + bonding key model was used to establish the numerical model of the soil particles, which was used to describe the irregularity and adhesion properties of the soil particles. The geometric model of the soil particles was established using the multisphere filling method. Finally, a composite contact model of corn straw‒soil particles was established, the contact parameters between straw and soil were calibrated via collision tests, inclined tests and inclined rolling tests, and the established composite contact model was further verified through direct shear tests between straw and soil. A theoretical foundation for the optimal design of equipment linked to maize harvesting is provided by this work.

Keywords: corn straw?soil composite modeling; numerical model of double-bonded bimodal distribution; Hertz?Mindlin model; JKR+ bonding model; DEM (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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