Eliminating the thermal softening of dynamically loaded specimens in the Kolsky bar system by multi-step loading

Y. Ashuach, C. Avinadav, Z. Rosenberg
2012 EPJ Web of Conferences  
We performed series of multi-step loading tests in our Kolsky bar system, and demonstrated that the thermal softening in strong aluminum alloys can be eliminated by multi-step loading. We showed that there is a significant difference in their stress-strain curves, compared with the result of a single shot test, due to adiabatic heating. The tests were carried out using our interferometry-based system, where the bar velocities are measured directly rather than the strains. The optical technique
more » ... as several advantages over traditional strain gauge measurements; it is non-intervening, highly repeatable, and more accurate at low strains, thus allowing good estimation of the dynamic yield point in these experiments. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
doi:10.1051/epjconf/20122601047 fatcat:gyb3yakhgbg57oercmvy4mkxbe