2012 Volume 53 Issue 1 Pages 201-208
This paper is concerned with application of the ring test to temperature and rate dependent materials. With this regard, the stress–strain response of AZ80 magnesium alloy was obtained for various temperatures, strains and strain rates by means of this experiment. Using finite element (FE) simulations, numerical sigmoid curves and calibration curves of the ring compression test were also determined. Moreover, the effects of temperature and deformation rate on the geometry of the numerical sigmoid curves were evaluated. By comparing the load-displacement curves obtained from the FE analyses with those of the experiments, it was found that the numerical sigmoid curves, compared with analytical ones, provided more accurate flow curves. Furthermore, the influences of the temperature and strain rate on the shape of the sigmoid curves were more perceptible at higher levels of friction.
