基于DEM-FEM的AZ31B板材軟模成形極限預測

基于DEM-FEM的AZ31B板材軟模成形極限預測Forming limit prediction in flexible die forming of AZ31B sheet based on combination of DEM-FEM

針對金屬板材固體顆粒介質成形工藝中散體顆粒的離散性能和板材連續變形特點，提出并構建離散元-有限元耦合仿真模型。通過試驗和數值模擬相結合的方法，建立鎂合金板材溫熱成形韌性破裂準則，并驗證該準則的有效性。最后結合韌性斷裂準則對AZ31B鎂合金固體顆粒介質筒形件溫熱拉深進行離散元-有限元耦合模擬，對其成形極限進行預測分析，并展開相應條件下的拉深成形試驗。結果表明：基于韌性斷裂準則的離散元-有限元耦合分析方法可以有效預測鎂合金板固體顆粒介質溫熱拉深成形極限。

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 AZ31B 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.

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