Determination of Mechanical Properties for the Hydroforming of Magnesium Sheets at Elevated Temperature

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Thanks to the low weight, magnesium alloys feature high specific strength and stiffness properties. Thus they prove to be promising materials for todays ambitious automotive light weight construction efforts. Due to their comparative low formability at room temperature the process of magnesium sheet hydroforming can be improved at temperatures higher than 200 °C by the activation of additional sliding planes. This paper illustrates the determination of mechanical properties for the hydroforming of magnesium sheets at elevated temperature. In particular the mechanical behavior at elevated temperature was investigated by means of the tensile test and of the hydraulic bulge test. For the determination of the strains an optical measurement system was introduced into the experimental set-up. The exact knowledge of the strain condition in the area of diffuse necking enabled the determination of the flow curve in the tensile test also beyond the uniform elongation. The influence of temperature and strain rate was analyzed as well as the influence of uni- and biaxial stress state on the flow curve. Using circular and elliptic dies with different aspect ratio the hydraulic bulge test served to determinate the forming limit curves at three different elevated temperatures.

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Edited by:

M. Geiger, J. Duflou, H.J.J. Kals, B. Shirvani and U.P. Singh

Pages:

779-786

DOI:

10.4028/www.scientific.net/AMR.6-8.779

Citation:

J. Hecht et al., "Determination of Mechanical Properties for the Hydroforming of Magnesium Sheets at Elevated Temperature", Advanced Materials Research, Vols. 6-8, pp. 779-786, 2005

Online since:

May 2005

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$35.00

[1] M. Geiger, M. Merklein, M. Celeghini, H. -G. Haldenwanger, M. Prier.: Wirkmedienbasierte Umformung von Rohren und Blechen bei erhöhten Temperaturen. In: Siegert K. (Hrsg. ) Hydroumformung von Rohren, Strangpressprofilen und Blechen. 28. -29. 10. 2003, FellbachStuttgart. p.273.

[2] H. Friedrich, S. Schumann: Research for a new age of magnesium in the automotive Industry, Journal of Materials Processing Technology 117 (2001) p.276.

[3] E. Doege, K. Dröder: Sheet metal forming of magnesium wrought alloys - formability and process technology, Journal of Materials Processing Technology 115 (2001) p.14.

DOI: 10.1016/s0924-0136(01)00760-9

[4] Europäische Norm EN 485-2.

[5] Aramis Users Manual V5. 3, GOM mbH, Braunschweig, Germany.

[6] F. Gologranc: Beitrag zur Ermittlung von Fließkurven im kontinuierlichen hydraulischen Tiefungsversuch, Dissertation, Institute for Metal Forming Technology, University of Stuttgart, Germany, (1975).

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