Experimental setup to characterize flow-induced anisotropy of sheet metals

International Deep Drawing Research Group 37th Annual Conference

Gutknecht, F.^1 ; Gerstein, G.^2 ; Traphöner, H.^1 ; Clausmeyer, T.^1 ; Nürnberger, F.^2

Institute of Forming Technology and Lightweight Components (IUL), TU Dortmund University, Baroper Str. 303, Dortmund

44227, Germany^1

Institut für Werkstoffkunde (Materials Science), Leibniz Universitat Hannover, An der Universitat 2, Garbsen, Germany^2

关键词: Deep drawing steel;    Flow-induced anisotropy;    Forming forces;    Hardening effects;    Hydraulic bulge test;    Load paths;    Manufacturing process;    Spring-back;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/418/1/012085/pdf
DOI  :  10.1088/1757-899X/418/1/012085

来源: IOP

【 摘 要 】

For many metals, a transient variation of the yield stress can be observed when changing the orientation of a load-path. Such behavior affects the manufacturing process itself, e.g. by increasing forming forces, altered material properties or springback of the manufactured components. Hence, the aim of this work is to develop a novel experimental setup to characterize hardening effects due to flow-induced anisotropy for sheet metals. The proposed experiment consists of two subsequent forming operations. Initially, a hydraulic bulge test is conducted, followed by torsion of the hemispherical preformed sheet. Such approach captures the effects of flow-induced anisotropy like cross hardening as could be proved for the example of the conventional deep-drawing steel DC04. The benefits of the presented setup are (i) high plastic strains in the pre-loading step and (ii) determination of several combinations of pre- and subsequent loading.