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http://dx.doi.org/10.5228/KSPP.2002.11.1.075

Finite Element Simulation of Axisymmeric Tube Hydroforming Processes  

김용석 (한양대학교 일반대학원 정밀기계공학과)
금영탁 (한양대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.11, no.1, 2002 , pp. 75-83 More about this Journal
Abstract
Recently, the hydroforming process is widely applied to the automotive industry and rapidly spreaded to other industries. In this paper, An implicit finite element formulation for simulating axisymmetric tube hydroforming processes is performed. In order to describe normal anisotropy of the tube, Hill's non-quadratic yield function is employed. The frictional contact between die and tube and the frictionless contact between tube and fluid are considered using the mesh-normal vectors computed from the finite element mesh of the tube. The complete set of the governing relations comprising equilibrium and interfacial equations is linearized for Newton-Raphson procedure. In order to verify the validity of the developed finite element formulation, the axisymmetric tube bulge test is simulated and the simulation results are compared with experimental measurements. In a simulation of stepped circular tube hydroforming processes, an optimal hydraulic pressure curve is pursued by considering simultaneously internal pressures and axial forces.
Keywords
Axisymmetric Tube Hydroforming; Finite Element Simulation; Tube Bulging; Axial Force Optimal Hydraulic Pressure;
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