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对纯铝进行等径角挤压、等径角挤压结合不同挤压比直接挤压及直接挤压,并采用刚-粘塑性3D有限元模拟进行分析。利用3D有限元模拟研究不同成形过程变形Al-1080的载荷-位移行为、塑性变形特征和有效塑性应变均匀性。用显微组织观察、显微硬度分布图、有效塑性应变和显微硬度值验证模拟结果。结果表明:模拟结果与实验结果一致;模拟载荷-位移曲线和最大载荷与实验结果接近;显微硬度分布图符合有效塑性应变等高线,证实了3D有限元模拟结果。等径角挤压工件的变形均匀性程度比其他变形过程的高。根据平均有效塑性应变计算了显微硬度值。预测显微硬度值与实验结果吻合。横向和纵向显微组织观察验证了不同成形过程中3D有限元模拟有效塑性应变和显微硬度分布结果。
The pure aluminum was subjected to isometric angular extrusion, isometric angle extrusion combined with different extrusion ratio direct extrusion and direct extrusion, and the rigid-viscoplastic 3D finite element simulation was used to analyze. The 3D finite element simulation is used to study the load-displacement behavior, plastic deformation characteristics and effective plastic strain uniformity of Al-1080 under different forming processes. The simulation results were verified by microstructure observation, microhardness distribution, effective plastic strain and microhardness. The results show that the simulation results are consistent with the experimental results. The simulated load-displacement curves and the maximum loads are close to the experimental ones. The micro-hardness distribution maps are in line with the effective plastic strain contours, confirming the 3D finite element simulation results. Equal angle angle extrusion workpiece deformation uniformity than other deformation process is high. The microhardness values were calculated from the average effective plastic strain. The predicted microhardness values agree well with the experimental results. Transverse and longitudinal microstructural observations validated the 3D plastic FEM simulation of effective plastic strain and microhardness distribution results for different forming processes.