Establishment of Hollow Flexible Model with Two Types of Bonds and Calibration of the Contact Parameters for Wheat Straw

Huinan Huang, Yan Zhang, Guangyu Hou, Baohao Su, Hao Yin, Zijiang Fu, Yangfan Zhuang, Zhijun Lv (), Hui Tian and Lianhao Li
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Huinan Huang: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Yan Zhang: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Guangyu Hou: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Baohao Su: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Hao Yin: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Zijiang Fu: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Yangfan Zhuang: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Zhijun Lv: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Hui Tian: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Lianhao Li: College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Agriculture, 2025, vol. 15, issue 15, 1-26

Abstract: In view of the lack of accurate model in the discrete element study during straw comprehensive utilization (crushing, mixing, and baling), wheat straw was taken as the research object to calibrate the simulation parameters using EDEM 2023. The intrinsic and contact mechanical parameters of wheat straw were measured, and a test of the angle of repose (AOR), extrusion test and bending test were carried out. On this basis, a discrete element model (DEM) of hollow flexibility by using cylindrical particles was developed. The optimal combination of contact mechanical parameters was obtained through AOR tests based on the Box–Behnken design (BBD), coefficients of static friction, rolling friction, and restitution between wheat straw and wheat straw-45 steel are separately 0.227, 0.136, 0.479, 0.271, 0.093, and 0.482, AOR is 18.66°. Meanwhile, optimal combinations of bond contact parameters were determined by the BBD. The calibrated parameters were used to conduct extrusion and bending tests. Results show that the average values of peak extrusion force and peak bending pressure are 23.20 N and 3.92 N, which have relative discrepancy of 3.25% and 3.59% compared to physical test measurements. The results can provide model reference for the optimization design such as feed processing equipment, baler, and mixer.

Keywords: wheat straw; discrete element method; angle of repose; extrusion and bending; parameter calibration (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: 2025
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