Mechanical properties of tissues in lotus seedpods with different maturity

WANG Hongchang; DU Dizhuang; PAN Rui; REN Zexu; ZHANG Guozhong; ZENG Rong

doi:10.13300/j.cnki.hnlkxb.2025.05.025

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Mechanical properties of tissues in lotus seedpods with different maturity

Food science and agricultural engineering | 更新时间：2026-11-05

- Mechanical properties of tissues in lotus seedpods with different maturity
- Journal of Huazhong Agricultural University Vol. 44, Issue 5, Pages: 249-258(2025)
- 作者机构：
  
  1.华中农业大学工学院，武汉 430070
  2.农业农村部长江中下游农业装备重点实验室，武汉 430070
- 作者简介：
- 基金信息：
- DOI：10.13300/j.cnki.hnlkxb.2025.05.025
  CLC： TS254.3
- Received：06 December 2024，
  
  Published：15 September 2025
- 稿件说明：
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王洪昌，杜弟壮，潘睿，等.不同成熟度莲蓬组织力学特性试验［J］.华中农业大学学报，2025，44（5）：249‐258.

WANG Hongchang,DU Dizhuang,PAN Rui,et al.Mechanical properties of tissues in lotus seedpods with different maturity[J].Journal of Huazhong Agricultural University,2025,44(05):249-258.
王洪昌，杜弟壮，潘睿，等.不同成熟度莲蓬组织力学特性试验［J］.华中农业大学学报，2025，44（5）：249‐258. DOI： 10.13300/j.cnki.hnlkxb.2025.05.025.

WANG Hongchang,DU Dizhuang,PAN Rui,et al.Mechanical properties of tissues in lotus seedpods with different maturity[J].Journal of Huazhong Agricultural University,2025,44(05):249-258. DOI： 10.13300/j.cnki.hnlkxb.2025.05.025.

摘要

为探究鲜莲蓬破蓬脱粒方式，以实现高效低损机械化莲籽脱蓬，以太空莲为研究对象，对不同成熟度莲蓬开展含水率、外观特征及力学特性试验研究，重点探究剪切、拉伸以及穿刺3种加载方式下莲蓬组织的破坏规律。结果表明，莲蓬中莲籽含水率最高，莲蓬表皮含水率最低，且随着莲蓬含水率降低，莲蓬表皮含水率下降最明显；莲蓬表皮剪切与拉伸表现为明显各向异性，加载方式对剪切及拉伸破裂力影响较大；随着成熟度的增加，莲蓬表皮横剪破裂力与轴向拉伸破裂力逐渐增大，分别从13.32 N增至21.91 N、13.70 N增至37.38 N，纵剪破裂力与横向拉伸破裂力无明显变化；加载速度对莲蓬表皮剪切及拉伸破裂力无显著影响；纤维组织完熟期平均拉伸破裂力最大，约为17.19 N，乳熟期与蜡熟期平均拉伸破裂力相差不大，加载速度对纤维组织拉伸破裂力无显著影响；莲蓬蓬面与表皮穿刺破坏不受各向异性的影响，随着成熟度的增加，蓬面穿刺破裂力逐渐减小，表皮穿刺破裂力逐渐增大；随着探头直径的增大，蓬面穿刺破裂力与表皮穿刺破裂力均增大，其最大值分别为21.60、32.05和39.25 N；表皮加载破裂力影响为加载方式>成熟度>加载速度。综合上述力学特性分析结果可知，可先施加穿刺载荷，再施加拉伸破裂力实现撕扯式破蓬。

Abstract

The space lotus was used to study the appropriate method of breaking and threshing fresh lotus seedpods to achieve the mechanized threshing of lotus seedpods with high efficiency and low damage. The content of moisture， the characteristics of appearance， and mechanical properties of lotus seedpods with different maturity were studied， with a focus on the failure patterns of tissues in lotus seedpods under three modes of loading including shear， tension， and puncture. The results showed that the content of moisture in lotus seedpods was the highest in seeds and the lowest in epidermis. The content of moisture in epidermis significantly decreased with the decrease of the content of moisture in lotus seedpods. The shear and tensile properties of epidermis in the lotus seedpods were obviously anisotropic， and the mode of loading significantly affected the rupture force of shear and tension. The rupture force of transverse shear and axial tension in the epidermis of lotus seedpods gradually increased with the increase of maturity， increasing from 13.32 to 21.91 N and 13.70 to 37.38 N， respectively. There was no significant change in the rupture force of longitudinal shear and transverse tension. The speed of loading had no significant effect on the rupture force of shear and tension in the epidermis. The average rupture force of tension in fiber tissues of lotus seedpods was larger at the stage of ripening， approximately 17.19 N. There was no significant difference in the average tensile strength between the stage of milk ripening and the stage of wax ripening， and the speed of loading had no significant effect on the tensile strength of the fiber tissues. Epidermal puncture damage of lotus seedpod was not affected by epidermal anisotropy. The rupture force of puncture in lotus seedpod decreased gradually with the increase of maturity， while the rupture force of epidermal puncture increased gradually. The rupture force of surface puncture and epidermal puncture increased with the increase of the diameter of the probe， with the maximum value of 21.60， 32.05， and 39.25 N， respectively. The effect of epidermal loading on the rupture force was in the decreasing order of mode of loading >maturity> speed of loading. It is indicated that the puncture loading was used first to destroy the lotus seedpod to achieve the damage with less destructive power， and then the tensile cracking force was used to achieve the efficient tearing of the lotus seed. It will provide theoretical basis for designing machines of peeling and threshing the fresh lotus seedpods.

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references

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