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。
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.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第5期136-141,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
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)
陕西科技大学科研创新团队基金资助项目(SKTD10-02)
关键词
板栗
真空破壳
力学特性
热质传递
有限元
Chestnut
Vacuum shelling
Mechanical properties
Heat and mass transfer
Finite element
作者简介
袁越锦，副教授，博士，主要从事干燥技术与设备研究，E—mail：yuanyj@sust．edu．cn
