Effect of temperature on anisotropy in forming simulation of aluminum alloys

Abstract

A combined experimental and numerical study of the effect of temperature on anisotropy in warm forming of AA 6016-T4 aluminum was performed. The anisotropy coefficients of the Vegter yield function were calculated from crystal plasticity models with an adequate combination of extra slip systems. Curve fitting was used to fit the anisotropy coefficients calculated at discrete temperatures. This temperature dependent constitutive model was successfully applied to the coupled thermo-mechanical analysis of deep drawing of aluminum sheet and results were compared with experiments.

Statistical Evaluation of the Influence of Temperature and Surface Roughness on Aluminium Sheet Metal Forming

“…In this study, the influences of the temperature and the punch surface roughness on the forming force were determined. It is known that the forming force decreases after the temperature increases [11,14]. The analysis of the relationship presented in Figure 2 among the forming force, the surface roughness and the temperature has shown that the forming force is substantially reduced as the temperature increases.…”

“…Sheet metal forming analysis software calculate the deformation in the sheet material depending on the yield function, yield stress and the anisotropy value. To this end, researchers worked on different models [8][9][10][11][12]. The preferred criterion is the Hill-48 model yield criterion, which is often used in forming analyses.…”

“…It can be seen that the increase in the temperature value reduces substantially the amount of springback. The decrease in yield strength and strain hardening along with the increase in temperature [11] leads to the reduction in the amount of springback occurring after the forming process [14]. While the highest amount of springback is measured at the temperature of 25°C and the surface roughness value of 0.4 and 0.6 μ, the lowest amount of springback is measured at the temperature of 260°C and the surface roughness value of 0.01 μ.…”

Bendability and failure mechanisms of dual phase steel under air-bending at elevated temperatures

“…For bending at 45, the springback decreased continuously, with the initial crack appearing on the convex bending surface, while the springback angle was likely to decrease as temperatures increased higher than 400 C. This was likely due to the yield strength and strain hardening decrease [12]. This leads to a reduction in the amount of springback occurring after the forming process [13].…”