基于离散元的不同轴截面形状下沙柳颗粒致密成型研究

为研究模具的结构形状对沙柳颗粒致密成型的影响,用离散元软件EDEM建立了沙柳颗粒模型,并将预先用Pro/E创建的3种不同结构的模具先后导入其中,在初始参数、条件设定完成后分别做了匀速压缩模拟。对比研究了3种模具下压缩力的做功,颗粒在竖直和水平方向的形变特征、受力过程,并通过后处理所得数据分析计算了各模具下成型燃料最终获得的密度和能量。结果表明:双弧度、双锥度、单锥度3种模具下压缩过程做功依次为48.86、56.93、66.02 J,燃料总能量分别是40.06、41.54、46.81 J,对应密度为1.23、1.19、1.17 g/cm3;竖直方向双弧度下燃料内部颗粒受到的接触力和发生的形变远大于其他两种模具,水平方向三者颗粒所受的接触力和发生的形变无太大差异;颗粒在3种模具下受到的粘接力均无明显不同,但各自所受的法向粘接力远大于切向粘接力。

Study on Dense Forming of Salix Granules Under Different Moulds Based on Discrete Element

In order to study the influence of the shape of the mold on the compact forming of the Salix granules,the Salix granule model was established by the discrete element software EDEM,and the molds of the three different structures previously created by Pro/E were introduced into it.After the parameters and conditions were set,a uniform compression simulation was performed.The work of compression force under three kinds of molds,the deformation characteristics of the particles in the vertical and horizontal directions,and the stress process were compared.The data obtained from the post-treatment data were used to calculate the final density and energy of the formed fuel under each mold.The results show that the work of compression in the double arc,double taper and single taper 3 is 48.86,56.93,66.02 J,and the total fuel energy is 40.06,41.54,46.81 J,and the corresponding density is 1.23,1.19,1.17g/cm3;the contact force and deformation of the internal particles of the fuel in the vertical direction of the double arc are much larger than those of the other two kinds of molds,and the contact of the particles in the horizontal direction is 3.The force and the deformation occurred are not much different;the adhesion of the particles under the three molds is not significantly different,but the normal adhesion is much greater than the tangential adhesion.