Strain Hardening and Damage in 6xxx Series Aluminum Alloy Friction Stir Welds

Abstract:

A friction stir weld in 6005A-T6 aluminum alloy has been prepared and analyzed by micro-hardness measurements, tensile testing and scanning electron microscopy (SEM). The locations of the various weld zones were determined by micro-hardness indentation measurements. The flow behavior of the various zones of the weld was extracted using micro-tensile specimens cut out parallel to the welding direction. The measured material properties and weld topology were then introduced in a fully coupled micro-mechanical finite element model, accounting for nucleation and growth of voids as well as void shape evolution. The model shows satisfactory preliminary results in predicting the tensile behaviour of the weld and the true strain at fracture.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 333-338
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.333
• Online since: January 2010
• Authors: Aude Simar, Kim Lau Nielsen, Bruno de Meester, Thomas Pardoen, Viggo Tvergaard
• Keywords: Aluminium Alloy, Friction Stir Welding (FSW), Gurson Model, Strain-Hardening

References

[1] A. Simar, Y. Bréchet, B. de Meester, A. Denquin, T. Pardoen: Acta Materialia, Vol. 55 (2007), pp.6133-6143.

DOI: 10.1016/j.actamat.2007.07.012

[2] A. Simar, Ph.D. thesis, Université catholique de Louvain, Belgium (2006).

[3] A. Simar, Y. Bréchet, B. de Meester, A. Denquin, T. Pardoen: Mater. Sci. Eng. A Vol. 486 (2008), pp.85-95.

[4] K.L. Nielsen, A. Simar, B. de Meester, T. Pardoen, V. Tvergaard: (report).

[5] M. Gologanu, J.B. Leblond, G. Perrin and J. Devaux: Recent extensions of Gurson's model for porous ductile metals, (Springer-Verlag, Berlin, 1997).

DOI: 10.1007/978-3-7091-2662-2_2

[6] A. Gurson: J. Eng. Mater. Techn. Vol. 99 (1977), pp.2-15.

[7] V. Tvergaard and A. Needleman: Acta Mater. Vol. 32 (1984), pp.157-169.

[8] C.C. Chu and A. Needleman: J. Eng. Mater. Techn. Vol. 102 (1980), pp.249-256.

[9] P.F. Thomason: Ductile fracture of metals, (Pergamon press, 1990).

[10] T. Pardoen and J.W. Hutchinson: J. Mech. Phys. Solids. Vol. 48 (2000), pp.2467-2512.

[11] H. Mecking and U.F. Kocks: Acta Metall. Vol. 29 (1981), pp.1865-1875.

[12] Y. Estrin and H. Mecking: Acta Metall. Vol. 51 (1984), pp.57-80.

[13] E. Voce: Acta Metall. Vol. 51 (1955), pp.219-226.

[14] D. Lassance, F. Scheyvaerts, T. Pardoen: Eng. Fract. Mech. Vol. 73 (2006), pp.1009-1034.