Avoiding Bending in Case of Uniaxial Tension with Electromagnetic Forming * O. K. Demir, C. Weddeling, N. Ben Khalifa, A. E. Tekkaya Institute of Forming Technology and Lightweight Construction, TU Dortmund, Germany Abstract During electromagnetic forming, excessive bending of the specimen takes place due to high velocities and inertia. We show that the excessive bending can be prevented by optimizing the coil geometry in case of uniaxial tension. The process is simulated with various coil geometries, and the resulting amount of bending is compared to the case of standard Nakajima Test. The comparison shows that the bending can be minimised to acceptable levels to be able to call the method a decent way of determining forming limits. The results should be verified experimentally. Keywords Forming limits, Electromagnetic forming, Nakajima Test 1 Introduction To determine the quasi-static forming limits of a material there are standard tests like Nakajima Test and Marciniak Test. In these tests, the material should be formed monotonically on distinct strain paths until failure. There is not a standard test in case of electromagnetic forming. The main reason for this is the difficulty to let forming proceed on a certain strain path monotonically: The specimen bends and twists in several planes due to practical impossibilities, high velocities, and inertia. * This work is based on the results of the German Research Foundation (DFG) project Te 508/10-2 (PAK343); the authors would like to thank DFG for its financial support 3