Glass and glass ceramic bars were struck with steel projectiles, causing compressive failure. The bars were observed with a high-speed camera, and the rear free-surface velocity history was measured with a photonic Doppler velocimeter. Propagating compressive fractures were observed at the impact ends, and explosive tensile failures were observed at the distal ends. Compressive strength and tensile strength were computed from the free-surface velocity records. There were shot-to-shot variations in the free-surface velocity histories. The compressive strength of the glass was in the range of 1.6+/-0.1 GPa at 104/s strain rate. The compressive strength of glass ceramic was about 2.6 GPa. The tensile strength in glass bars varies between 0.6 and 1.2 GPa and is greater than glass ceramic; however, in this experiment, tensile failure is probably an extrinsic-as opposed to intrinsic-process, due to surface flaws.
Impact onto glass and glass ceramic bars
Aufprall auf Glas- und Glaskeramikstäben
2009
12 Seiten, 11 Bilder, 1 Tabelle, 25 Quellen
Conference paper
English
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