Modeling mechanical response and texture evolution of α-uranium as a function of strain rate and temperature using polycrystal plasticity

Thermomechanical Response of Polycrystalline alpha-Uranium

“…Post-deformation textures were measured in the same fashion as the pre-deformation textures on HIPPO. In both cases, it is clearly seen that the strongest texture evolution is seen under RD compression, which is consistent with previous results [1,35]. The {020} intensity shifts from along the rolling direction before deformation to the transverse direction.…”

“…Strain, % Stress, MPa After comparing the tension and compression data along the rolling direction, a tensioncompression asymmetry can be observed, as previously reported [35]. Figure 3.4 shows the macroscopic stress-strain curves for loading along the rolling direction.…”

“…Prior studies have shown that di↵erent loading directions activated di↵erent deformation mechanisms at di↵erent applied stress levels [31,35], so with the aim of identifying changes in individual deformation mechanism activities, examining more loading conditions was viewed as a priority. Compression experiments were conducted along RD and TD, and tensile experiments were conducted along RD.…”

“…Such a low value is consistent with the activity of high temperature recovery processes. Assuming the CRSS values remain independent of temperature provided the best model of the experimental data despite the strong temperature variation in CRSS previously observed in single crystals [2] and polycrystals [35]. Simulations that incorporated the temperature dependence of CRSS under-predicted the level of observed relaxation.…”

“…Roof slip is usually observed only near the transition temperature in single crystals [2], but has been considered in crystal plasticity modeling of low temperature deformation [41] as it is necessary to close the single crystal yield surface [9]. The interplay between these di↵erent deformation mechanisms has been recently investigated [1,8,30,31,35].…”