<p>The mechanical properties of castor stalk play an important role in the design of clamping, cutting, and harvesting devices, as well as in the comprehensive utilization of biological resources. The study measured the mechanical properties of the stalks and its contact parameters (stalk–stalk, stalk–steel) with experiment. The particle model with each layer of stalk tissue was established by the discrete element method (DEM). The contact and bonding parameters were calibrated through the stalk bending simulation. The accuracy of the model was verified by stalk cutting and compression simulation. Meanwhile, the fracturing process of stalks was analyzed. The mechanical behavior and motion laws among the particles in each layer of the stalk tissue during the compression process were analyzed. The results show that the model can reflect the mechanical properties of castor stalks. The equivalent stress of the pith part particles is greater than the CX (cortex and xylem part) particles in the compression process. The particle velocity on the upper side of the first layer in the pith is the largest, which is 8.01 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\text{m }{\text{s}}^{-1}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>m</mtext> <mspace width="0.333333em" /> <msup> <mrow> <mtext>s</mtext> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation>. The particle velocity on the upper side of the CX is the smallest, which is 0.23 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\text{m }{\text{s}}^{-1}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>m</mtext> <mspace width="0.333333em" /> <msup> <mrow> <mtext>s</mtext> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation>. The particle movement distance on the upper side of the CX is the largest, which is 9.68 mm. The particle movement distance on the lower side of the first layer in the pith is the smallest, which is 4.84 mm. These results are very important for studying the mechanical properties of castor stalk and the fracture mechanisms of stalk shear shearing and compressing.</p>

Compression behavior of castor stalk: an experiment and simulation investigation on its different layer particles based on discrete element method

期刊论文
发表日期：

2025年6月5日

查看全文

Junming Hou,
Zhi Ma,
Yue Ma,
Xu Liu,
Jiuyu Jin,
Yachen Yu,
Ziyuan Tang,
Wei Wang

摘要

The mechanical properties of castor stalk play an important role in the design of clamping, cutting, and harvesting devices, as well as in the comprehensive utilization of biological resources. The study measured the mechanical properties of the stalks and its contact parameters (stalk–stalk, stalk–steel) with experiment. The particle model with each layer of stalk tissue was established by the discrete element method (DEM). The contact and bonding parameters were calibrated through the stalk bending simulation. The accuracy of the model was verified by stalk cutting and compression simulation. Meanwhile, the fracturing process of stalks was analyzed. The mechanical behavior and motion laws among the particles in each layer of the stalk tissue during the compression process were analyzed. The results show that the model can reflect the mechanical properties of castor stalks. The equivalent stress of the pith part particles is greater than the CX (cortex and xylem part) particles in the compression process. The particle velocity on the upper side of the first layer in the pith is the largest, which is 8.01 $\text{m }{\text{s}}^{-1}$ $m s^{- 1}$ . The particle velocity on the upper side of the CX is the smallest, which is 0.23 $\text{m }{\text{s}}^{-1}$ $m s^{- 1}$ . The particle movement distance on the upper side of the CX is the largest, which is 9.68 mm. The particle movement distance on the lower side of the first layer in the pith is the smallest, which is 4.84 mm. These results are very important for studying the mechanical properties of castor stalk and the fracture mechanisms of stalk shear shearing and compressing.