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Erschienen in:
01.06.2009 | Production Process
Determination of material properties for hot hydroforming
Erschienen in: Production Engineering | Ausgabe 2/2009
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Abstract
For the process design of hydroforming in the “hot” temperature range, reliable data are necessary to describe the material behaviour at elevated temperatures under the occurring loads of hot hydroforming processes. State-of-the-art technologies for the investigation of material behaviour, like uniaxial tensile tests or hydraulic bulge tests, do not provide enough similarity with the process of hot hydroforming. This paper describes a new testing technique, capable of realizing high process temperatures and constant strain rates. It represents a further development of the established technology of tube bulge tests. The hardware is described, its functionality is proven and mathematical approaches for the calculation of stress/strain-curves from experimental data are presented.