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Construction and Verification of Spherical Thin Shell Model for Revealing Walnut Shell Crack Initiation and Expansion Mechanism

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Listed:
  • Xiulan Bao

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Wuhan 430070, China)

  • Biyu Chen

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Wuhan 430070, China)

  • Peng Dai

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Wuhan 430070, China)

  • Yishu Li

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Wuhan 430070, China)

  • Jincheng Mao

    (School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China)

Abstract

Walnut shell breaking is the first step of deep walnut processing. This study aims to investigate the mechanical properties and fracture state of the Qingxiang walnut shell under unidirectional load and guide the complete separation of the walnut shell and kernel. The spherical thin shell model of the walnut (the fitting error is less than 5%) was established and verified. The process from the initiation to the expansion of walnut cracks was analyzed. The crack expansion rate was estimated in terms of the crack fracture regularity on the shell’s surface. Based on the momentless theory and finite element simulation analysis, we found that the stress on the shell surface in the concentrated force action region was gradient distributed from inside to outside and that the internal forces were equal in all directions in the peripheral force action region. The unidirectional impact shell-breaking experiments confirmed the reliability of our spherical thin shell model and verified our hypothesis of walnut shell fracture along the longitudinal grain. Our results can provide a theoretical basis for the development and structural optimization of shell-breaking machinery.

Suggested Citation

  • Xiulan Bao & Biyu Chen & Peng Dai & Yishu Li & Jincheng Mao, 2022. "Construction and Verification of Spherical Thin Shell Model for Revealing Walnut Shell Crack Initiation and Expansion Mechanism," Agriculture, MDPI, vol. 12(9), pages 1-13, September.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:9:p:1446-:d:913028
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    References listed on IDEAS

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    1. Jiannan Wang & Minji Liu & Huichang Wu & Jinyi Peng & Baoliang Peng & Yanshan Yang & Minzhu Cao & Hai Wei & Huanxiong Xie, 2022. "Design and Key Parameter Optimization of Conic Roller Shelling Device Based on Walnut Moisture-Regulating Treatments," Agriculture, MDPI, vol. 12(4), pages 1-15, April.
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