Investigation of Springback Using Two Different Testing Methods
In the current work springback has been studied with two different testing methods
using simulations as well as experiments. First the draw-bend test has been employed to
investigate the springback due to bending loads. Therefore a sample strip has been pre-bent
to a 90°-angle. Then, this strip was drawn over a cylinder emulating the radius of a die for a
forming process like deep drawing. After force removal the resulting deviation from the 90°-angle
was used to compare springback in simulation and experiment. The second test
consisted of taking a ring out of the wall of a deep drawn cup. The ring was split with a single
axial cut. The resultant geometry and residual radius were used to compare numerical and
experimental results. The advantages of these simple tests compared to investigations on real
industrial parts are the possibility to exclude friction (draw-bend test) and to define the
forming conditions very specific (cup). Within first investigations different material models
and finite element programs have been considered.
Martin ROHLEDER, Karl ROLL, Alexander BROSIUS, Matthias KLEINER
Reçu le 18 juillet 2001.
Accepté le 22 février 2002.
Sheet Metal Forming, Springback, Finite Element Simulation, Implicit and Explicit Method.