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Title: Consistent Parameters for Plastic Anisotropy of Sheet Metal (Part 1-Uniaxial and Biaxial Tests)

The anisotropy parameters for sheet metal used hitherto are mainly determined by uniaxial tensile tests. Such tests, however, do not give sufficient information about the yield locus and the forming behaviour in that range where the two principal tensile stresses are of similar magnitude like in stretch forming. The same applies for combined tensile and compressive stress like in deep-drawing. To fill these gaps, new parameters are defined. Their experimental determination is briefly discussed.The 'equibiaxial yield stress' and 'equibiaxial anisotropy' which refer to equibiaxial tensile stress can be determined by cross tensile tests. However, these require a special apparatus. Alternatively experiments for obtaining plane strain can be applied for determining the equibiaxial parameters indirectly. This is possible using conventional tensile testing machines. In this case also anisotropy parameters for plane-strain deformation, the 'semibiaxial anisotropy' in rolling and transverse direction, can be determined.
Authors:
;  [1] ;  [2] ;  [3]
  1. Institut fuer Statik und Dynamik der Luft -und Raumfahrtkonstruktionen, Universitaet Stuttgart, Pfaffenwaldring 27, D-70569 (Germany)
  2. Institut fuer Umformtechnik, Universitaet Stuttgart, Holzgartenstr. 17, D-70174 Stuttgart (Germany)
  3. Technical University of Cluj-Napoca, C. Daicoviciu nr. 15, 400020 Cluj-Napoca (Romania)
Publication Date:
OSTI Identifier:
21057037
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 907; Journal Issue: 1; Conference: 10. ESAFORM conference on material forming, Zaragoza (Spain), 18-20 Apr 2007; Other Information: DOI: 10.1063/1.2729542; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; ANISOTROPY; DEFORMATION; DRAWING; METALS; PLASTICITY; ROLLING; SHEETS; STRAINS; STRESSES; TENSILE PROPERTIES; TESTING