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The potential presence of Nickel Sulfide (NiS), which contaminates glass melt, can provoke “spontaneous” rupture even after years from installation. This is why most standards recommend that glass panels bearing a safety risk are subjected to the Heat Soak Test (HST): they are exposed to a certain temperature for a certain time so to destroy the glass panes affected by critical NiS inclusions before installation. A micro-mechanically motivated model for assessing the risk of spontaneous failure of thermally-treated glass is here proposed. This correlates the statistical expectation of finding a critical NiS inclusion with the breakage consequent to its volumetric expansion due to phase transformation. Three functions à la Weibull for the probability of spontaneous rupture during lifetime are derived for the case of no HST, short HST and long HST. This analysis may contribute to solve the long-standing problem of defining the risk of spontaneous breakage in glass due to NiS inclusions, by assessing the optimal holding time of the HST as a function of the risk reputed acceptable for the particular application of glass. A parametric analysis shows the potentiality of the proposed approach.
Glass Structures & Engineering – Springer Journals
Published: Jul 11, 2019
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