Strain rates in high velocity forming of foils

Energy- and working media based high velocity forming processes show various advantages forming metal foils. However, due to different process characteristics, differences in workpiece response by impulse transfer for different high velocity forming processes are expected. Free forming experiments with 50 µm metallic foils were carried out to identify the process influence, using electromagnetic forming and laser shock forming. For these two forming methods the response of the workpiece was described. The description was done by in-situ measurement of the strain and the strain rate over time and determination of workpiece velocities.