Enhancement in the Modeling of Temperature and Strain Rate‐Dependent Plastic Hardening Behavior of a Sheet Metal

Abstract

In the present study, viscoplastic hardening behavior of aluminum alloy 3003 sheet was measured and existing hardening models were evaluated in terms of the accuracy for predicting strain rate and temperature-dependent flow behaviors. Moreover, a modified hardening model was proposed to capture the flow stress-strain responses under various strain rates and temperatures with enhanced accuracy. Mechanical responses of the material were measured by using uniaxial tensile test at various temperature (%25-250 8C) and strain rates (%0.001-0.3 s À1 ), and the split Hopkinson pressure bar (SHPB) test was also conducted to obtain flow behavior at the strain rate over 700 s À1 at room temperature.Based on these experimental data, two well accepted viscoplastic constitutive modelsJohnson-Cook and Khan-Huang-Liang-were evaluated. Finally, the Hollomon/Voce type model was further developed, which resulted in significant improvement in predicting the flow stress curves under wide range of strain rate and temperature.

A Constitutive Equation for the Flow and Densification Behaviors of Powder Metallurgy Fe-0.5C-2Cu Steel at Elevated Temperatures

“…During hot deformation, the material flow behavior that usually consists of work hardening and dynamic softening is significantly influenced by the deformation parameters, including the deformation temperature, deformation amount, and strain rate. For this reason, a number of studies concerning the hot deformation behaviors of wrought steels were conducted via isothermal hot compression tests under different deformation parameters . These works focused on the constitutive relationship between the flow stress and deformation parameters, and the deformation mechanisms such as work hardening (WH), dynamic recovery (DRV), and dynamic recrystallization (DRX), in order to design and optimize the plastic formation process.…”

UN crash safe vehicle design using human body models.

“…This material is widely used in Aluminium honeycomb and by the automotive industry. LEEM et al, 2015). Besides that it was used E = 70 GPa, ν = 0.3 and…”