变形方式对模压变形5052铝合金影响的有限元模拟与试验研究

Finite Element Simulation and Experimental Research on the Influence of Pressing Mode on 5052 Aluminum Alloy Processed by Groove Pressing

采用DEFORM-3D有限元软件研究了限制模压变形(Constrained Groove Pressing,CGP)和非限制模压变形(Unconstrained Groove Pressing,UGP)两种变形方式对模压变形5052铝合金等效应变累积速率和最终等效应变量的影响,并试验研究了两种变形方式对5052铝合金晶粒细化的影响。结果表明,CGP变形比UGP变形具有更高的等效应变累积速率和终等效应变量;在相同的变形工艺条件下,CGP变形的晶粒细化能力显著优于UGP变形;CGP与UGP变形在晶粒细化能力上的差异是由于模具结构的不同而引起的本质差异,与材料体系和变形工艺条件无关.

Finite element simulation was carried out for analyzing the accumulative rate of equivalent strain and final equivalent strain of 5052 aluminum alloy processed by constrained groove pressing （CGP） and unconstrained groove pressing （UGP）. In addition, experiments were conducted for investigation of grain refinement as a function of accumulative rate of equivalent strain as well as final equivalent strain. The results show that CGP has a higher accumulative rate of equivalent strain and final equivalent strain than UGP. Compared with UGP, CGP is more beneficial to grain refinement due to the higher accumulative rate of equivalent strain and final equivalent strain, which is determined by two different mold constructions and independent of the material and processed condition.