Mechanical Behavior and Residual Stresses in AZ31 Wrought Magnesium Alloy Subjected to Four Point Bending

  1. Prof. Dr.-Ing. K. U. Kainer
  1. J. P. Nobre1,
  2. U. Noster1,2,
  3. J. Gibmeier1,2,
  4. I. Altenberger1,2,
  5. M. Kornmeier1,
  6. A. Dias1 and
  7. B. Scholtes1,2

Published Online: 15 MAY 2006

DOI: 10.1002/3527607552.ch53

Magnesium Alloys and their Applications

Magnesium Alloys and their Applications

How to Cite

Nobre, J. P., Noster, U., Gibmeier, J., Altenberger, I., Kornmeier, M., Dias, A. and Scholtes, B. (2000) Mechanical Behavior and Residual Stresses in AZ31 Wrought Magnesium Alloy Subjected to Four Point Bending, in Magnesium Alloys and their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607552.ch53

Editor Information

  1. GKSS-Forschungszentrum Geesthacht GmbH, Institut für Werkstofforschung, Max-Planck- Straße, D-21502 Geesthacht, Germany

Author Information

  1. 1

    Department of Mechanical Engineering, University of Coimbra, Portugal

  2. 2

    Institute of Materials Technology, University Gh Kassel, Germany

Publication History

  1. Published Online: 15 MAY 2006
  2. Published Print: 20 SEP 2000

ISBN Information

Print ISBN: 9783527302826

Online ISBN: 9783527607556



  • magnesium alloys;
  • mechanical development;
  • AZ31 wrought magnesium alloy;
  • mechanical behavior;
  • residual stresses


Several specimens of AZ31 magnesium alloy were taken in different directions from a rolled plate and subjected to tensile, compressive and four-point bending tests. Tensile and compressive tests allowed to characterize the mechanical properties of the material in the rolling and cross rolling directions. The bending tests were carried out in four different specimen types to take the effect of the anisotropy induced by the rolling procedure itself into account. Six strain gages per specimen allowed to observe the evolution of the strain with the bending moment during the tests. All bending specimens were bent until a total compressive deformation of 2.5 %. It was observed that the corresponding tensile strain was significant lower and slightly different for each specimen type. In addition, a characteristic non-uniform distribution of deformation twinning was observed. The induced residual stresses after bending were characterized by X-ray diffraction (XRD) and incremental hole-drilling (IHD). Due to the different mechanical behavior in tension and compression, an asymmetric residual stress distribution after bending could be observed. The neutral axis was, in all cases, shifted towards the tensile side. This observation agrees with the strain measurements during bending tests.