Kočiško Róbert, Kvačkaj Tibor, Bidulská Jana, Bidulský Róbert, Petroušek Patrik, Pokorný Imrich, Lupták Miloslav, Actis Grande Marco
Department of Plastic Deformation and Simulation Processes, Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Park Komenského 11, 04001 Kosice, Slovakia.
Bodva Industry and Innovation Cluster, Budulov 174, 04501 Moldava nad Bodvou, Slovakia.
Materials (Basel). 2023 Jan 8;16(2):601. doi: 10.3390/ma16020601.
The aim of the article is to examine the workability of sintered powder material of aluminum alloy (Alumix 321) through severe plastic deformations under the conditions of the equal channel angular rolling (ECAR) process. Accordingly, the stress-strain analysis of the ECAR was carried out through a computer simulation using the finite element method (FEM) by Deform 3D software. Additionally, the formability of the ALUMIX 321 was investigated using the diametrical compression (DC) test, which was measured and analyzed by digital image correlation and finite element simulation. The relationship between failure mode and stress state in the ECAR process and the DC test was quantified using stress triaxiality and Lode angle parameter. It is concluded that the sintered powder material during the ECAR processing failure by a shearing fracture because in the fracture location the stress conditions were close to the pure shear ( and θ¯ ≈ 0). Moreover, the DC test revealed the potential role as the method of calibration of the fracture locus for stress conditions between the pure shear and the axial symmetry compression.
本文的目的是通过等通道转角挤压（ECAR）工艺条件下的严重塑性变形来研究铝合金烧结粉末材料（Alumix 321）的加工性能。因此，利用Deform 3D软件通过有限元方法（FEM）的计算机模拟对等通道转角挤压进行了应力应变分析。此外，使用径向压缩（DC）试验研究了ALUMIX 321的可成形性，该试验通过数字图像相关和有限元模拟进行测量和分析。利用应力三轴性和洛德角参数对等通道转角挤压过程和径向压缩试验中的失效模式与应力状态之间的关系进行了量化。得出的结论是，在等通道转角挤压加工过程中，烧结粉末材料因剪切断裂而失效，因为在断裂位置应力条件接近纯剪切（且θ¯≈0）。此外，径向压缩试验揭示了其作为校准纯剪切和轴对称压缩之间应力条件下断裂轨迹方法的潜在作用。
