44211 2017 eng lecture 0 -- -- -- In-situ observation of sub-critical crack growth in water bearing borate glasses 185 cracks were initiated in a soda-lime-silica glass by Vickers indentation and grown under controlled dry nitrogen atmosphere. Direct observation of subcritical crack growth (SCCG) upon indentation was performed using a video camera with an image acquisition rate of 3 ms. The results show that the validity of K(c) relations used to determine the indentation fracture toughness from a single imprint is questionable. It seems that correlation of crack length to stress intensity necessitate the use of statistical significant data of multiple crack events. FFAG 7: 7th International Workshop on Flow and Fracture of Advanced Glasses Aalborg, Denmark 02.07.2017 05.07.2017 0 P. Kiefer eng uncontrolled Sub critical crack growth eng uncontrolled Glass eng uncontrolled Vickers eng uncontrolled Water bearing glass eng uncontrolled Indentation fracture toughness Ingenieurwissenschaften und zugeordnete Tätigkeiten Datei im Netzwerk der BAM verfügbar ("Closed Access") Präsentation