Numéro
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 851 - 856
DOI https://doi.org/10.1051/jp4:2006134131
Publié en ligne 26 juillet 2006
EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 851-856

DOI: 10.1051/jp4:2006134131

The effect of aspect ratio on the compressive high rate deformation of three metallic alloys

S.M. Walley1, D.D. Radford2, 0 and D.J. Chapman1

1  PCS Group, Cavendish Laboratory, University of Cambridge CB3 0HE, UK
2  Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK


Published online: 26 July 2006

Abstract
Metallic cylinders of rolled homogeneous armour (RHA) steel, Ti6Al4V, and FNC tungsten alloy of four different length l to diameter d ratios (dimensions in mm): 8/4, 4/8, 10/8, 8/10) were deformed at high rates of deformation using a direct impact Hopkinson pressure bar. Highspeed photographic sequences of the deformation were taken using a Hadland Imacon 790 imageconverter camera working at either 1 or 2 x 104 frames/s. It was found that titanium alloy cylinders of all four aspect ratios shear-banded and fractured, but that cylinders made from RHA steel and FNC tungsten behaved in a ductile manner when l/d < 1 but in a brittle manner when l/d > 1. We conclude that adiabatic shear banding is not just an inherent material property but that in some materials size effects/geometry can trigger this phenomenon.



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