筒仓中油菜籽堆高安全域的研究

Experimental Study on Security Domain of Rapeseed Height in Silo

建立筒仓中油菜籽分层压缩平衡微分方程,实验测定微分方程中的参数,得到筒仓内不同深度油菜籽堆应力分布;建立筒仓中油菜籽籽粒堆放模型,给出筒仓内不同深度油菜籽的应力与籽粒压力的关系;设定油菜籽籽粒产生0. 5%的塑性应变为籽粒损伤阈值,结合筒仓内不同深度油菜籽堆应力分布以及籽粒受力与应变,给出油菜籽的堆高安全域。数值计算结果表明:油菜籽含水率为7.11%～13.52%w.b.时,半径为10 m的筒仓内油菜籽堆高安全域为22.00～45.59 m,半径为15 m的筒仓内油菜籽堆高安全域为19.78～35.97 m,半径为20 m的筒仓内油菜籽堆高安全域为18. 87～32. 76 m;筒仓内油菜籽的堆高安全域随着含水率的增大而减小,随着筒仓半径的增大而减小。

The hierarchical compression equilibrium differential equation of rapeseed in silos was established and the relevant parameters of the equations were determined,so the stress distribution of rapeseed heap in different depths of silo can be calculated;rapeseed heap stacking model in silos was established to determine the relationship between rapeseed heap stress and seed stress in different depths;it was defined that rapeseed seed was damaged when it was produced 0.5%plastic strain.Combining the stress distribution of rapeseed heap in different depths in the silo,and the stress and strain of rapeseed seed,the security domain of rapeseed heap height was calculated.The numerical results showed that when the moisture content of rapeseed ranged from 7.11%to 13.52%,the security domain of rapeseed height in silo with a radius of 10 m ranged from 22.00 to 45.59 m,a radius of 15 m ranged from19.78 to 35.97 m,and a radius of 20 m ranged from 18.87 to 32.76 m;the security domain of rapeseed height in the silo was decreased with the increasing moisture content and the silo radius.