It’s well known that the microstructure dramatically affects the strain behaviour of superplastic materials. Virtually, each batch should be characterized ex novo: optimal ranges of temperature and strain rate as well as material constants have to be defined. An accurate and simple characterization methodology based on a strain condition close enough to the real forming process is of great industrial interest. In this work, a characterization methodology based on an experimental and numerical approach is proposed. Experimental free inflation tests with a pressure jump were carried out on a titanium alloy. Results were used as reference data for an inverse analysis based on the height evolution of the dome. Material constants were calculated by means of a genetic algorithm. The approach was verified with further experimental results and a good correlation was found.

Characterization of a superplastic titanium alloy with an experimental and numerical approach based on free-inflation tests

SORGENTE, Donato;PICCININNI, Antonio;PIGLIONICO, Vito;GUGLIELMI, Pasquale;PALUMBO, Gianfranco;TRICARICO, Luigi
2016-01-01

Abstract

It’s well known that the microstructure dramatically affects the strain behaviour of superplastic materials. Virtually, each batch should be characterized ex novo: optimal ranges of temperature and strain rate as well as material constants have to be defined. An accurate and simple characterization methodology based on a strain condition close enough to the real forming process is of great industrial interest. In this work, a characterization methodology based on an experimental and numerical approach is proposed. Experimental free inflation tests with a pressure jump were carried out on a titanium alloy. Results were used as reference data for an inverse analysis based on the height evolution of the dome. Material constants were calculated by means of a genetic algorithm. The approach was verified with further experimental results and a good correlation was found.
2016
12th International Conference on Superplasticity in Advanced Materials, ICSAM 2015
9783038356721
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/62887
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