Temperaturabhängiges Materialverhalten von Glaskeramiken unter Stoßwellenbelastung

The dynamical behaviour of a machinable glass-ceramic with the trading name Macor and a glass-ceramic with a very low thermal expansion coefficient with the trading name Robax was investigated, using the planar impact technique in combination with a VISAR velocity interferometer. For the planar impact facility at the Fraunhofer-Institut für Kurzzeitdynamik a heating device was designed to determine the dynamical behaviour at higher temperatures. From the velocity-time profiles the Hugoniot elastic limit, the spall strength, the Hugoniot stress, the strain and the strain rate were determined. The results of the room temperature and higher temperature experiments are shown in diagrams, where the Hugoniont elastic limit is plotted against the Hugoniot stress, the shock velocity against the particle velocity, the Hugoniot stress against the strain, and the Hugoniot stress against the strain rate. Shock-wave experiments were carried out on the Macor glass-ceramic with the flyer -plate techn ique at room- and pre-shock temperatures of 300øC and 600øC at shock pressures of 30, 45, 60 and 75 GPa. The microstructural behaviour from the recovered samples were examined with X-ray diffraction, SEM and TEM. Furthermore the distortion, the microhardness and the density of the experimentally shocked samples were determined.