TITLE:
Measurement of the Deformation of Aluminum Alloys under High Strain Rates Using High Speed Digital Cameras
AUTHORS:
Gbadebo Owolabi, Daniel Odoh, Alex Peterson, Akindele Odeshi, Horace Whitworth
KEYWORDS:
Split Hopkinson Pressure Bar; Torsion Kolsky Bar; Digital Image Correlation System; Adiabatic Shear Band; Post Deformation Analysis
JOURNAL NAME:
World Journal of Mechanics,
Vol.3 No.2,
April
30,
2013
ABSTRACT: Aluminum alloys exhibit an attractive
combination of mechanical and physical properties such as high stiffness and
low density, which favors their utilization in many structural applications.
Thus, increasing the structural applications of aluminum alloy is the driving
force for the need to adequately understand its deformation and failure
mechanisms under various types of dynamic loading conditions. In this study,
full field plastic deformation of AA6061-T6 aluminum alloy at high strain-rates
under compressive and torsion loads are measured using split Hopkinson
compression, torsion Kolsky bars, and a high speed digital image correlation
system. The stress-strain curves obtained using the high speed digital cameras
are compared with results obtained from the elastic waves in the compression and
torsion bars. A post deformation analysis of the specimen also shows strain
localization along narrow adiabatic shear bands in the AA6061-T6 alloy.