An Analysis Of Superplastic Free Forming At
Constant Pressure
Author(s)
G. Giuliano & S. Franchitti
Abstract
Superplastic materials are characterised by very low strength during forming and
by large plastic deformations. Superplasticity is observed in some metal alloys
when deformed under particular conditions, namely:
• very fine grain size (10µm);
• high temperature (greater than about one-half the absolute melting
point);
• a controlled strain rate (10-4–10-2 s-1).
In recent years, there has been a considerable interest in the aircraft and
automotive industries using superplastic forming to obtain complex parts. In
these industrial sectors superplastic forming (SPF) of sheet metal has been used
to produce, with a low number of mechanical steps, several sheet metal
components that are lighter and stronger than conventional components.
The increasing spread of superplastic forming processes has focussed the
attention of technologists onto problems of optimising process parameters. The
design of these processes is more difficult than conventional manufacturing
operations. In fact, to successfully produce an SPF component it is essential to
control a variety of different parameters during the forming process: temperature,
material grain size, strain-rate distribution due to the pressure forming and the
final distribution of thicknesses.
In this study the superplastic behaviour of PbSn60, an alloy that is
superplastic at room temperature, is evaluated during constant pressure free
bulging. A set of experimental tests were carried out in order to determine the
characteristic parameters of the PbSn60.
Keywords: superplastic forming, constitutive equation, finite element method.
Keywords
superplastic forming, constitutive equation, finite element method.
Related Book
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