New Possibilities for Improved Bending of Vibration Damping Laminated Sheets

Abstract Bending of vibration damping laminated sheet metal has been presenting serious difficulties arising from time dependent material springback, undesired deformation of the long bending legs, and separation of the steel sheets. New methods of improving the bending behaviour of steel sheets have been established as a consequence from experiments and investigations on the viscoelastic-plastic core layer of composites. Considerable improvement will be obtained by the selective use of temperature fields in connection with heated bending tools. A following heat treatment will significantly reduce the delayed springback time which has been up to two weeks at room temperature so far.