Influence of subregional flexible-die control on deformation behavior of Al1060 sheet during bulging process
Aiming at the contradiction between the overall control of flexible-die performance in traditional flexible-die forming and the differentiated needs of different deformation areas of parts,magnetorheological fluid was used as the forming flexible-die material to con-duct bulging experiments and simulation studies on Al1060 sheet under subregional flexible-die control.The focus was on the effect of cen-ter-dominant magnetic field and edge-dominant magnetic field on the deformation behavior of the sheet.The results show that the use of subregional flexible-die control method can significantly change the deformation behavior of sheet during bulging process.Under the cen-tral-dominant magnetic field,the ellipticity of the specimen is 0.85,and the fracture position is located at the sudden change area of the magnetic field.The maximum strain occurs at the position with radius of about 10 mm.Under the edge-dominant magnetic field,the ellip-ticity of the specimen is 0.47,and the fracture position is located near the cavity fillet area,resulting in more uniform overall strain distri-bution.The mechanical properties of magnetorheological fluid in different areas affect the deformation and stress state of the sheet,ulti-mately leading to changes in the configuration and fracture location of bulging parts.
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维普
