Stress Superposition in Metal Forming: Fundamentals and Applications

Seminar Speaker: A. Erman Tekkaya, IUL, TU Dortmund University, Dortmund/Germany

Abstract: Stress superposition is a powerful feature of plasticity to enhance metal forming processes in order to reduce forming forces, improve product properties and increase forming limits. Hence, stress superposition can contribute to the reduction of the CO₂-emmission by reducing the sizes of forming machines and tools, by increasing the performance of the products and, finally, by increasing the material utilization in forming. The presentation discusses the fundamentals of the three basic stress superposition types: Monotonic mechanical stress superposition, cyclic mechanical stress superposition and ultrasonic vibrations. The physical phenomena behind the effects of each type of stress superposition will be revealed and examples provided. The presentation concludes with various applications.

Biography: Dr. A. Erman Tekkaya is professor at the Institute for Metal Forming and Lightweight Components (IUL) of the TU Dortmund University in Dortmund/Germany. He studied mechanical engineering in Ankara/Turkey and completed his doctoral studies in Stuttgart/ Germany. His research interests cover fundamentals and technology of novel metal forming processes as well as material characterization for modelling plastic deformations. Dr. Tekkaya is fellow of the International Academy for Production Engineering (CIRP) and member of the German Materials Society (DGM). He is editor of Advances in Industrial and Manufacturing Engineering (AIME) and the former editor the Journal of Materials Processing Technology (JMPT).