Analysis Of Superplastic Forming Process In A Circular Closed-die
Author(s)
L. Carrino, G. Giuliano and G. Napolitano
Abstract
Analysis of superplastic forming process in a
circular closed-die
L. Carrino, G. Giuliano & G. Napolitano
Department of Industrial Engineering,
University of Cassino, Italy.
Abstract
Superplasticity is the ability of ultrafine-grained materials to exhibit extremely
large elongation with a forming temperature of around half the absolute melting
point and a very low strain-rate of the order of loq3 - S-I. A substantial help
in order to analyze the superplastic forming processes is offered by finite element
modelling (FEM). In the FEM formulation, it is assumed that a superplastic
material characterised by ample plastic deformations, is described as an
uncompressible, non-linear, viscous fluid. The numerical simulation of friction
between the forming tool and the material is carried out making reference to
Coulomb's modified model. By FEM it is possible to determine: i) the pressuretime
load curve to maintain the strain-rate of the material as near as possible to
the optimum strain-rate, ii) the
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