Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Bending of advanced high strength steels – Forming behavior and limits of bendability



Datum: 19.10.2012


Author


Reporter

  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. Dr.-Ing. E. h. A. E. Tekkaya

The significant strength-based structural lightweight construction capability of advanced high strength steels is still limited by its moderate formability and its altered failure behavior compared to conventional mild steel grades. Thus in the scope of the work both the forming behavior and the resulting limits of formability were deeply investigated and the knowledge about appearing damage and its interference was significantly enhanced. First of all, the failure phenomena were detected and underlying damage mechanisms were identified. In the next step, a new methodology based on optical strain measurement was developed and verified to analyze the failure stages with quantitative measures and in a user-independent manor. This procedure can well be applied to conventional steel and aluminum sheet materials, too. Altogether, the work provides new approaches and knowledge for industrial scale bending of sheet material and therefore gives a prerequisite for improved and material specific process and component design in industrial relevant issues.