Numerical analysis of interruption process of dynamic tensile tests using a Hopkinson bar

Abstract
In this study, it was modified a tensile Hopkinson bar with which it can be carried out tests up to a predetermined strain. During dynamic test using a Hopkinson bar, the final strain reached by the specimen was controlled by a stopping elongation system; this system include a snap ring to attenuate the effects of the compressive waves produced as result of the stopping system. To establish the characteristics of stopping system and to determine the suitable material for snap ring, simulation models had been performed using finite element method. Different materials were considered for the snap ring, such as lead and polypropylene. The incident, reflected and transmitted waves obtained on the numerical simulation of the trapped dynamic test were compared with the unmodified one.