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Relaxation of stresses in glass surface regions by subcritical crack growth

Fett, T.; Schell, K. G. ORCID iD icon; Bucharsky, C.; Rizzi, G.


In previous reports, we dealt with the SIF computations of semielliptical surface cracks introduced in glass specimens by grinding. It can simply be shown that subcritical extension of such cracks must result in a reduction of stresses applied to the specimen.
We apply this effect on tensile tests and on torsion tests by Aaldenberg et al. carried out on cylindrical specimens at temperatures between 550°C and 700°C in normal lab air environment. The torsion moments Mt measured by Aaldenberg et al. decreased with time t for a constant drill angle. This effect was interpreted by Aaldenberg et al. as a proof for a relaxation effect by the presence of molecular water.
In the present report, we discuss the possibility that the reduction of the torsion moment is caused by subcritical crack growth that results in comparable effects.

Volltext §
DOI: 10.5445/IR/1000135923
Veröffentlicht am 28.07.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 2194-1629
KITopen-ID: 1000135923
Verlag Karlsruher Institut für Technologie (KIT)
Umfang VI, 13 S.
Serie KIT Scientific Working Papers ; 172
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