Ageing of Glass

Fatigue in glass means that its strength is not constant over time but deteriorates. This phenomenon may happen when a glass is stressed in an atmosphere containing water. Fatigue is observed when testing glass under stress below catastrophic failure. The classic theory due to Charles and Hillig to...

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Bibliographic Details
Published inGlass pp. 199 - 210
Main Author Le Bourhis , Eric
Format Book Chapter
LanguageEnglish
Published Germany Wiley 2014
Wiley‐VCH Verlag GmbH & Co. KGaA
Subjects
ageing phenomena
Charles and Hillig theory
crack healing
glass
nickel sulfide (NiS) phase transformation
static fatigue
stress corrosion
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Summary:Fatigue in glass means that its strength is not constant over time but deteriorates. This phenomenon may happen when a glass is stressed in an atmosphere containing water. Fatigue is observed when testing glass under stress below catastrophic failure. The classic theory due to Charles and Hillig to account for stress corrosion involves the chemical reaction of a water molecule with silica, taking place at the tip of the crack. Ageing of glass may also be observed because of the physical transformation of internal defects like metastable nickel sulfide (NiS) inclusions. These undergo a slow transformation at room temperature from a dense to a less dense phase. Crack healing is reported with related ‘closing’ of the cracks. Thereafter, the mechanical performance may be improved. Nonetheless after the heat treatment is completed, ageing is observed again in the annealed glass as its stress at rupture decreases with the lifetime.
ISBN:3527337059
9783527337057
DOI:10.1002/9783527679461.ch09