基于Drucker-Prager模型的铝合金料仓应力数值模拟

Numerical Simulation of Stress in Aluminum Alloy Silo Based on Drucker-Prager Model

铝合金是石油化工行业中制作大型料仓的主要材料。基于Drucker-Prager本构模型,建立了散料与铝合金料仓相互作用的三维有限元模型,模拟了料仓在静态储料工况下的应力大小及分布规律,并分析了散料密度、摩擦因数、弹性模量和膨胀角对料仓应力的影响。模拟分析结果表明,料仓应力随着筒体高度增大而逐渐减小,在锥筒连接处锥底靠下部位,料仓应力达到最大值。随着散料密度和摩擦因数的增大,料仓应力增大,而弹性模量对料仓应力影响不大。膨胀角变化时,筒体部分应力变化不大,但锥底部分应力变化比较明显,应力值相差最大达到8%。

Aluminum alloy is the main material used to make large silo in petrochemical industry. A three dimensional finite element model accounting for interaction between the aluminum alloy silo wall and granular material based on Drucker Prager plasticity criterion was established,stress distribution of silo was simulated when stored granular materials are in static state,and the effects of granular material＇s density, friction coefficient, elasticity modulus and dilatancy angle on silo were analyzed. Results showed that,while the cylinder height increased, the stress of aluminum alloy silo would decrease,and the maximum value was reached in cone. With the increase of density and friction coefficient, the stress of silo would increase, and the elasticity modulus has lit tie effect on the stress distribution. When the dilatancy angle changed,the stress in cylinder re mained unchanged while the stress in cone changed obviously, and the stress value of the maxi mum difference reached eight percent.