Stress uniformity of split Hopkinson pressure bar under half-sine wave loads

摘要

To make feasible the application of split Hopkinson pressure bar (SHPB) in dynamic tests for brittle materials, loading techniques with non-rectangular waves have been developed in recent years [1,2]. Among such techniques, the special shape striker method, dedicated to generating half-sine waves with tapered ends from short cylinders, has been proved to have several advantages [1,3-6]: (a) capability of avoiding the premature failure of brittle specimens; (b) better stress equilibrium in specimens; (c) less oscillation in signals and the resultant stress-strain curves and (d) easier to keep the specimen deforming at a constant strain rate, which is vital for tests of rate-dependant materials.