Experimental Research on the Bending and Fracture Characteristics of Cotton Stalk

IF 1.4 4区农林科学 Q3 AGRICULTURAL ENGINEERING

Transactions of the ASABE Pub Date : 2021-01-01 DOI:10.13031/trans.14589

Peng Jiang, Yaping Li, Jiali Li, Hewei Meng, Xiangbin Peng, Bingcheng Zhang, Jiaxing He, Za Kan

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引用次数: 2

Abstract

HighlightsA two-factor randomized block design was used to study the influence of experimental factors on indicators.Specific fracture energy can indicate the relationship between mass and power.A cotton stalk model was established using the discrete element method (DEM).Abstract. Effectively chopping of the mixture of mulch film and cotton stalk recycled by machine is the only way to achieve subsequent separation of the materials. Cotton stalk is one of the main components of the mixture. According to the working principle of a chopping device, the bending and fracture characteristics of cotton stalk samples were measured. A two-factor random block design was used to study the effects of moisture content and sample location on the plant on the mechanical characteristics of the stalk samples. According to the results, the specific fracture energy of the stalk samples was calculated. The results showed that the relationship between the moisture content and bending performance of the samples was an inverse proportional function in general. However, when the moisture content was 20% to 30%, the fracture energy in the double-support bending tests was low, which was therefore the most suitable condition for chopping. In addition, a cotton stalk model was established using the discrete element method (DEM), and the optimal parameter combination was determined. Compared with the actual test results, the model error of the peak bending force was 1.20%. This study can support the analysis of chopping device simulation and material preparation in experimental research. Keywords: Bending fracture characteristics, Cotton stalk, Discrete element method, Three-point bending test.

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棉花茎秆弯曲断裂特性的试验研究

采用双因素随机区组设计，研究实验因素对各指标的影响。比断裂能可以反映质量与功率的关系。采用离散元法(DEM)建立了棉花秸秆模型。对机器回收的地膜与棉秆的混合物进行有效的剪切是实现材料后续分离的唯一途径。棉秆是该混合物的主要成分之一。根据剪断装置的工作原理，测定了棉秆试样的弯曲和断裂特性。采用双因素随机区组设计，研究了水分含量和样品位置对茎秆样品力学特性的影响。根据实验结果，计算了秸秆试样的断裂比能。结果表明，试样的含水率与弯曲性能之间一般呈反比关系。而当含水率为20% ~ 30%时，双支撑弯曲试验的断裂能较低，是劈裂的最适宜条件。此外，利用离散元法(DEM)建立了棉花秸秆模型，确定了最优参数组合。与实际试验结果比较，峰值弯曲力模型误差为1.20%。本研究可为斩波装置的仿真分析和实验研究中的材料制备提供支持。关键词:弯曲断裂特性，棉秆，离散元法，三点弯曲试验

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来源期刊

Transactions of the ASABE AGRICULTURAL ENGINEERING-

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.