Characterization of superplastic materials by results of free bulging tests

Materials Science Forum. 2016. Vol. 838-839. P. 552–556.

Aksenov S. A., Zakhariev I., Osipov S., Kolesnikov A.

Determination of material constants describing its behavior during superplastic gas
forming is the main subject of this study. The main feature of free bulging tests is the stress-strain
conditions which are very similar to ones occurring in the most of gas forming processes. On the
other hand, the interpretation of the results of such tests is a complicated procedure. The paper
presents a simple technique for the characterization of materials superplasticity by free bulging tests,
which is based on inverse analysis. The main idea of this technique is a semianalytical solution of
the direct problem instead of finite element simulation which allows one to reduce the calculation
time significantly. At the same time the results this simplified solution are accurate enough to obtain
realistic material constants.

Keywords: Superplastic forming, free bulging, biaxial tension, material characterization, Сверхпластичная формовка, двуосное растяжение, свободная формовка, определение свойств материала

Publication based on the results of: Mathematical simulation of the behavior of materials with nonlinear mechanical properties under hot deformation (2015)