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基于刚粘塑性有限元法,在模拟过程中采用分步模拟的方法,对有限元网格进行分步重划分和步长的分步设置,并提出了解决体积损失问题的补偿方法,在Deform-3D有限元软件上实现了薄壁复杂截面铝型材的分流组合模挤压成形过程的三维数值模拟。分析了铝合金口琴管挤压过程中的金属的流动和变形行为,获得了速度场、温度场、应力场和应变场的分布图,数值模拟结果与理论分析结果吻合较好。结果表明:采用有限元分步模拟可以在保证模拟精度的前提下大幅缩短模拟运算时间,是模拟薄壁复杂截面铝合金空心型材挤压成形过程的有效方法。
Based on the rigid visco-plastic finite element method, a step-by-step simulation method is used to set up the step-by-step re-division and step-by-step steps for the finite element mesh. The compensation method for solving the volume loss problem is proposed. -3D finite element software to achieve a three-dimensional numerical simulation of shunt extrusion die extrusion process for thin section aluminum sections with complex thickness. The metal flow and deformation behavior during the extrusion of aluminum alloy harmonica was analyzed. The distribution of velocity field, temperature field, stress field and strain field were obtained. The numerical simulation results agree well with the theoretical analysis. The results show that the finite element simulation can shorten the simulation time greatly under the premise of ensuring the accuracy of the simulation. It is an effective method to simulate the extrusion process of aluminum alloy hollow profile with thin section and complex cross section.