引用本文:刘世界,王格格,郭 阳.基于有限元的平房仓内部粮食颗粒摩擦力分析[J].粮油食品科技,2019,27(5):91-96.
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基于有限元的平房仓内部粮食颗粒摩擦力分析
刘世界1, 王格格2, 郭 阳1
1.中国建筑第七工程局有限公司,河南 郑州 476000;2.武汉理工大学 经济学院,湖北 武汉 430070
摘要:
为探究粮食颗粒内部之间的应力分布及颗粒与仓壁之间相对静摩擦力的分布规律,在考虑粮食颗粒压缩性对粮堆剪胀参数影响的情况下,通过理想弹塑性本构关系和Drucker-prager屈服准则,并采用非关联流动法则来模拟储料,建立了粮仓仓壁与粮食之间正压力、相对静摩擦力的有限元模型,分别模拟不同装粮高度下仓壁与粮食之间的相对静摩擦力、正压力等,找到不同装粮深度处仓壁的相对静摩擦系数分布规律。结果表明,不同装粮高度处的相对静摩擦系数是不同的,伴随深度的增加,系数呈先增加后减小趋势。可见,粮食颗粒相互间的作用力及颗粒与仓壁之间的静摩擦力对粮食重量测量具有十分重要的指导意义。
关键词:  有限元  颗粒  内部应力  静摩擦力
DOI:
分类号:
基金项目:
Analysis of friction among grain particles in warehousebased on finite element method
Abstract:
In order to investigate the stress distribution between grain particles and the distribution of relative static friction between grain particles and silo walls, the ideal elastic-plastic constitutive relationship and Drucker-prager yield criterion were used to simulate grain storage considering the effect of grain compressibility on the shear dilatancy parameters. The finite element model of the positive pressure and relative static friction between the barn wall and the grain was established. The relative static friction and positive pressure between the barn wall and the grain at different grain loading heights were simulated respectively, and the distribution law of the relative static friction coefficient of the barn wall at different grain loading depths was found. The results show that the relative static friction coefficients are different at different grain filling heights. The specific performance is that with the increase of depth, the coefficient increases first and then decreases. It can be seen that the interaction force between grain particles and the static friction force between grain particles and silo wall have very important guiding significance for the measurement of grain weight.
Key words:  finite element  particle  internal stress  static friction