| 板栗真空破壳力学特性有限元分析 |
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| 引用本文： | 袁越锦,袁月定,党新安,徐英英,董继先,徐君臣.板栗真空破壳力学特性有限元分析[J].农业机械学报,2011,42(5):136-141. |
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| 作者姓名： | 袁越锦 袁月定 党新安 徐英英 董继先 徐君臣 |
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| 作者单位： | 1. 陕西科技大学机电工程学院,西安,710021
2. 宜春学院数学与计算机科学学院,宜春,336000 |
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| 基金项目： | 陕西省教育厅自然科学专项基金资助项目（2010JK455）、浙江省科技厅面上农业资助项目（2009C32102）和陕西科技大学科研创新团队基金资助项目（SKTD10-02） |
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| 摘 要： | 以半球形板栗为研究对象,运用有限元方法和传递过程原理建立了板栗真空破壳的有限元模型,并采用间接顺序耦合法对模型进行了求解.模拟与试验结果表明:运用该模型模拟分析板栗真空破壳力学特性可行；真空破壳过程中应力和应变主要沿栗壳边缘分别向弧顶和壳底中心递减分布；湿应力是真空破壳的主导因素；绝对压力对破壳的影响很大,绝对压力的降低不仅使压差应力增大,同时也使湿应力增大.
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| 关 键 词： | 板栗 真空破壳 力学特性 热质传递 有限元 |
Finite Element Method on Mechanical Properties of Vacuum Shelling Chestnut |
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| Yuan Yuejin
,
Yuan Yueding
,
Dang Xin'an
,
Xu Yingying
,
Dong Jixian
,
Xu Junchen.Finite Element Method on Mechanical Properties of Vacuum Shelling Chestnut[J].Transactions of the Chinese Society of Agricultural Machinery,2011,42(5):136-141. |
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| Authors: | Yuan Yuejin Yuan Yueding Dang Xin'an Xu Yingying Dong Jixian Xu Junchen |
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| Institution: | Shaanxi University of Science and Technology;Yichun University;Shaanxi University of Science and Technology;Shaanxi University of Science and Technology;Shaanxi University of Science and Technology;Shaanxi University of Science and Technology |
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| Abstract: | Taking the hemispherical chestnut as the study object, a finite element model for the mechanical properties of vacuum shelling chestnut was established by applying the finite element method and transport-process theory. The simulation and experimental results indicated that the finite element model could explain the mechanical properties of vacuum shelling chestnut well. The moisture distribution of chestnut shell was higher in the bottom center area and lower in the shell edge. The value of stress and strain was decreasing from the shell edge to the bottom center and arc peak. The wet stress played an important role in the vacuum shelling process, and was about five times larger than the pressure difference stresses in the initial and middle stage, but the wet stress decreased gradually at the end of the shelling process. The vacuum degree had a great effect on the vacuum shelling process, and the increasing vacuum degree did not only increase the pressure difference stresses but also the wet stresses. |
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| Keywords: | Chestnut Vacuum shelling Mechanical properties Heat and mass transfer Finite element |
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