Hydraulic bulge test in accordance with DIN EN ISO 16808

The hydraulic bulge test with an optical measuring system in accordance with EN ISO 16808 is used to determine biaxial stress-strain curves and flow curves at high plastic deformations. By means of these characterisation methods, an extension of the in the tensile test recorded flow curve, up to the uniform strain, can be realised by means of conversion into the uniaxial stress state. Using this proven approach, a more accurate extrapolation of the flow curves can be made. The improvement of the material properties ensures an improved mapping and design of forming processes.

Feasible experiments and experimental parameters:

• Biaxial stress-strain curves and flow curves for high plastic deformations
• Extension of the uniaxial flow curve from the tensile test