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

Uniaxial tensile tests were performed on the newest type of Meissner rheome ter with an ABS (acrylonitrile-butadiene-styrene) material. Tests were cond ucted for constant strain rates varying from 0.01 to 1 (1/s), at the temper atures ranging from 150 to 200 degrees C. Based on the experimental data, a new model was proposed, in which, strain hardening, strain rate sensitivit y, temperature changes and the variation in the hardening index could be ta ken into consideration. In this new model, a new parameter, w, was introduc ed, which represents the variation in the hardening index. The proposed mod el can approximate the experimental data of the uniaxial tensile test quite well. Two existing models were also employed to approximate the material b ehavior, however, both of them exhibited the poor accuracy. Finally, a simp le stretch deformation was simulated employing the three different models, and the differences in the final thickness and shape were confirmed. (C) 19 99 Kluwer Academic Publishers.