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Maximum shielding stress intensity factors in silica

Schell, K. G.; Bucharsky, C.; Rizzi, G.; Fett, T.

Abstract:
When water penetrates into silica surfaces near a crack tip, it reacts with the
SiO$_{2}$ network and generates hydroxyl $\equiv$SiOH. Due to the hydroxyl generation,
silica expands and gives rise for swelling stresses. The consequence is a
fracture mechanics shielding stress intensity factor K$_{sh}$<0. The fracture mechanical
treatment of swelling in the crack-tip region is significantly complicated
by the occurrence of damage due to the production of hydroxyls.
A maximum possible shielding effect is obtained by using an asymmetry parameter
h=1 in the crack wake ($\delta$$_{h}$<0) and neglecting the tension region ahead
the crack tip, where strong damage is present under hydrostatic tension
($\delta$$_{h}$<0)
.

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Volltext §
DOI: 10.5445/IR/1000117527
Veröffentlicht am 04.03.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2194-1629
KITopen-ID: 1000117527
Verlag KIT, Karlsruhe
Umfang VI, 13 S.
Serie KIT Scientific Working Papers ; 137
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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