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Department of Mechanical Engineering

Analysis of Strain Path-Dependent Damage and Microstructure Development for the Numerical Design of Sheet-Bulk Metal Forming Processes

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in
  • Massivumformung
  • Mechanik
  • Umformtechnische Grundlagenforschung
  • Materialcharakterisierung
  • Verbund- / Großprojekt
Evaluation of the accuracy of different damage models regarding the occurrence of failure © IUL
Evaluation of the accuracy of different damage models regarding the occurrence of failure
Funding German Research Foundation (DFG)
Project SFB/TR 73 • Subproject C4
Contact Florian Gutknecht M. Sc.
Status Completed

In collaboration with the Institute of Materials Science (IW) at Leibniz University Hannover, the development of voids and microcracks during forming and the influence on the subsequent component quality have been investigated over the past 12 years. For this purpose, different approaches for determining damage were compared and new material characterization methods were developed. These were used, among other things, to determine micromechanically motivated material parameters such as void nucleation in damage models. In addition, an analytical model for failure due to shearing from the sheet plane (Mode III) has been developed. A new fracture criterion has been added to the numerical damage models, which can be calibrated with few tests and it can be implemented comparatively easy (see figure). Investigations on forming processes have shown that a damage model for sheet bulk metal forming must consider a reduction of the void volume.