茭白压缩力学特性试验研究
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1.华中农业大学、农业农村部长江中下游农业装备重点实验室;2.华中农业大学工学院、农业农村部长江中下游农业装备重点实验室;3.华中农业大学工学院;4.金华市农业科学研究院

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S226

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特色蔬菜体系水生蔬菜生产机械化岗


Experimental study on compressive mechanical propertiesof Zizania latifolia
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1.Huazhong Agricultural University;2.Jinhua Academy of Agricultural Sciences

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    摘要:

    针对茭白加工、收获等机械装备设计与仿真分析时缺乏理论依据的问题,对茭白物料特性开展了研究。利用质构仪对茭白进行了静载压缩实验,获得不同压缩方向、压缩速率下茭白刚度、破损强度和弹性模量,利用扫描电子显微镜(SEM)获得了茭白微结构,分析了不同压缩方向下茭白力学特性差异性的内在机理。结果表明:茭白为各向异性材料,茭白X轴、Y轴、Z轴方向上的平均刚度分别为37.88N/mm、36.66N/mm、50.82N/mm;平均破损强度分别为0.74MPa、0.72MPa、0.88MPa;平均弹性模量分别为1.73MPa、1.61MPa、2.33MPa;压缩方向对茭白刚度、弹性模量和破损强度的影响极显著(p<0.001),在30~70mm/min压缩速率范围内压缩速率对刚度、弹性模量和破损强度的影响不显著(p>0.05);其X轴和Y轴方向的微结构特征相似且与Z轴方向差异较大,沿X轴和Y轴方向分布有孔隙,是导致这两个方向上压缩力学特性参数值偏小的原因。本文研究结果可为茭白生产机械化装备设计与分析提供理论参考。

    Abstract:

    In order to solve the problem of lack of theoretical basis in the design and simulation analysis of Zizania latifolia processing, harvesting and other equipment, research on the characteristics of Zizania latifolia materials were studied. Static load compression experiments were carried out on Zizania latifolia using a texture apparatus to obtain the stiffness, damage strength and modulus of elasticity of Zizania latifolia under different compression directions and compression rates, and the microstructure of Zizania latifolia was obtained by using a scanning electron microscope (SEM) to analyze the intrinsic mechanism of the variability of the mechanical properties of Zizania latifolia under different compression directions. The experimental results showed that Zizania latifolia was anisotropic material. The average stiffness values of Zizania latifolia in the X axis, Y axis and Z axis were 37.88 N/mm, 36.66 N/mm and 50.82 N/mm respectively. The average damage strengths were 0.74 MPa, 0.72 MPa, 0.88 MPa, respectively. And the average modulus of elasticity was 1.73 MPa, 1.61 MPa, 2.33 MPa, respectively. The compression direction had a highly significant effect on the stiffness, elastic modulus and damage strength of Zizania latifolia (p<0.001), and the effect of compression rate on stiffness, elastic modulus and damage strength was not significant in the range of compression rate from 30 to 70 mm/min (p>0.05). The microstructural features in the X-axis and Y-axis directions were similar and different from those in the Z-axis direction. The distribution of pores along the X-axis and Y-axis directions is the reason for the small values of compressive mechanical properties in these two directions. The results of this paper could provide theoretical reference for the packaging, storage and mechanized production of Zizania latifolia.

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  • 收稿日期:2024-09-04
  • 最后修改日期:2024-11-01
  • 录用日期:2024-11-08
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