Viscoplastic modeling of ABS material under high-strain-rate uniaxial elongational deformation

Uniaxial tensile tests were performed on the newest type of Meissner rheometer with an ABS (acrylonitrile-butadiene-styrene) material. Tests were conducted for constant strain rates varying from 0.01 to 1 (1/s), at the temperatures ranging from 150 to 200 °C. Based on the experimental data, a new model was proposed, in which, strain hardening, strain rate sensitivity, temperature changes and the variation in the hardening index could be taken into consideration. In this new model, a new parameter, w, was introduced, which represents the variation in the hardening index. The proposed model can approximate the experimental data of the uniaxial tensile test quite well. Two existing models were also employed to approximate the material behavior, however, both of them exhibited the poor accuracy. Finally, a simple stretch deformation was simulated employing the three different models, and the differences in the final thickness and shape were confirmed.