The success of a gas pressure superplastic forming operation depends on accurate formulation of a pressure–time diagram which in turn needs an accurate stress–strain relationship evaluated preferably under multiaxial or biaxial conditions. The present analysis describes a technique of generating such curves from gas pressure cone forming tests and subsequent manipulation of the data. The method also includes an innovative technique of online monitoring of strain during the forming process by measuring the volume of displaced air from the die during progress of forming.
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