Simulation method for aluminum alloy sheet metal forming based on quasi-flow corner theory
Sheet metal forming is widely used in the manufacturing of thin-walled structures for transportation vehicles,and finite element simulation method can effectively shorten the research and development cycle of new forming processes.In order to ensure the effectiveness of forming prediction for sheet metal,a stress updating algorithm for finite element numerical simulation was developed based on the Quasi-flow corner constitutive theory.A semi-implicit return mapping algorithm was used to combine the Quasi-flow corner theory with the Barlat'89 yield criterion considering material rolling anisotropy(QF-Barlat'89).Then,the constitutive model was implemented into the finite element analysis software Abaqus by using the material subroutine VUMAT.The accuracy of the algorithm was verified by analyzing the force characteristics of single element.Further,simulation prediction was conducted on the uniaxial tensile and cylindrical deep drawing processes of AA5052-O aluminum alloy samples,and the influence of sheet size on forming quality was analyzed.The results show that the QF-Barlat'89 constitutive model can effectively predict the forming characteristics of the sheet metal,such as failure displacement,thickness reduction and strain distribution,which renders it suitable for simulation research on forming processes of sheet metal.
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