基于DEM-FEM的AZ31B板材軟模成形極限預(yù)測

基于DEM-FEM的AZ31B板材軟模成形極限預(yù)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(zhì)成形工藝中散體顆粒的離散性能和板材連續(xù)變形特點(diǎn)，提出并構(gòu)建離散元-有限元耦合仿真模型。通過試驗(yàn)和數(shù)值模擬相結(jié)合的方法，建立鎂合金板材溫?zé)岢尚雾g性破裂準(zhǔn)則，并驗(yàn)證該準(zhǔn)則的有效性。最后結(jié)合韌性斷裂準(zhǔn)則對AZ31B鎂合金固體顆粒介質(zhì)筒形件溫?zé)崂钸M(jìn)行離散元-有限元耦合模擬，對其成形極限進(jìn)行預(yù)測分析，并展開相應(yīng)條件下的拉深成形試驗(yàn)。結(jié)果表明：基于韌性斷裂準(zhǔn)則的離散元-有限元耦合分析方法可以有效預(yù)測鎂合金板固體顆粒介質(zhì)溫?zé)崂畛尚螛O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.

全文下載：http://pan.baidu.com/s/1boC45K7