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The split Hopkinson bar is a well-known apparatus\udfor performing tests at high strain-rate on engineering\udmaterials. The specimen is placed between two long bars and\udquickly loaded by a pressure wave, which travels at sound\udspeed along the input bar, passes through the specimen, then\udis partly reflected and partly transmitted to the output bar. In\udthe classical version, the input wave is generated by the\udimpact of a striker bar against the input bar at a given velocity.\udIn the direct version of the Hopkinson bar, the wave is\udgenerated by pre-loading and releasing a portion of the input\udbar. However, with this approach the rise time of the pressure\udwave is usually longer respect to the classical version. In this\udpaper, an innovative wave generation system is presented,\udwhich exploits the abrupt shear fracture of a thin brittle disc.\udIn this way, the rise time of the incident waves can be close to\udthat obtained by the classical impact-based Hopkison bars\ud(80 ls instead of 50 ls). Moreover, both tension and compression\udtests can be carried out with the same experimental\udsystem

Design of an Innovative System for Wave Generation in Direct Tension–Compression Split Hopkinson Bar