The fracture behavior in brittle materials when impacted by a long bar was evaluated experimentally. An experimental setup utilizing a long bar impact of low velocity, wich can measure directly an dynamic force applied to the specimen under a specified contact pressure, was developed. The influence of contact pressure on the fracture behavior in brittle materials during impact punching was investigated by profiles of dynamic force generated and the damage appearance developed in soda-lime glass and alumina plates. It was possible to evaluate quantitatively the impact punching process by the long bar impact experiment. The application of contact pressure has changed the stress fields within the specimen and made possible the fabrication of a complete hole in brittle plates. The measured dynamic force increased with the increase of the contact pressure applied to specimen. The application of a higher contact pressure reduced the extent of damage developed in the specimen by a low velocity bar impact.
展开▼
