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.
Highlights
Plastic deformation behavior of metals and alloys at high strain rates has continued to attract research interest in order to understand their deformation and failure mechanisms at rapid rates of loading
The dynamic and fracture behavior of materials at such high strain rates are different from those normally observed under quasi-static loading conditions
One unique feature of the digital image correlation (DIC) is that the location for the onset of strain localization can be observed from the plot of minor strain against section length
Summary
Plastic deformation behavior of metals and alloys at high strain rates has continued to attract research interest in order to understand their deformation and failure mechanisms at rapid rates of loading. In SHB systems, elastic waves captured by strain gauges attached to the incident and transmitter bars are used is determining the strains generated in the test specimens during dynamic impact loading. Non-contact measuring technique in which strain is measured directly on the test specimens can provide a more accurate strain measurement during dynamic impact loading. Non-contact testing techniques have been used in the measurement of strain and 3D displacement of an object in stress and static analysis [9] One of such technique is the optical measurement system that includes holography, speckle interferometry, speckle photography, white light speckle, and digital image correlation (DIC). The deformation that occurs during high strain rate deformation of AA6061-T6 aluminum alloy both in compression and in torsion is measured using the DIC and the elastic wave techniques.
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