基于DEM-FEM的AZ31B板材软模成形极限预测

Forming limit prediction in flexible die forming of AZ31B sheet based on combination of DEM-FEM

针对金属板材固体颗粒介质成形工艺中散体颗粒的离散性能和板材连续变形特点,提出并构建离散元-有限元耦合仿真模型。通过试验和数值模拟相结合的方法,建立镁合金板材温热成形韧性破裂准则,并验证该准则的有效性。最后结合韧性断裂准则对AZ31B镁合金固体颗粒介质筒形件温热拉深进行离散元-有限元耦合模拟,对其成形极限进行预测分析,并展开相应条件下的拉深成形试验。结果表明:基于韧性断裂准则的离散元-有限元耦合分析方法可以有效预测镁合金板固体颗粒介质温热拉深成形极限。

For discrete property of solid granules and continuous deformation of sheet metal in the solid granule medium forming(SGMF) process,a simulation model combination of discrete element method and finite element method(DEM-FEM) was proposed and established.Ductile fracture criteria of magnesium alloy sheet warm forming was also established,and its validity was verified combining experiment with finite element simulation.Furthermore,the cylindrical part of AZ31 B magnesium alloy with SGMF process was simulated based on DEM-FEM and the experiment was carried out.The results show that,the analysis method of DEM-FEM based on ductile fracture criteria can effectively predict the forming limit of magnesium alloy sheet warm forming with the solid granule medium.