Ceramics-Silikáty 55, (3) 214 - 220 (2011) |
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STATISTICAL ANALYSIS OF A SODA LIME GLASS THERMAL SHOCK RESISTANCE
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Malou Zahra 1,2, Hamidouche Mohamed 1,2, Bouaouadja Noureddine 2,
Fantozzi Gilbert 3
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1 Unité de recherche Matériaux Emergents, Université Ferhat Abbas 19000 Sétif, Algérie
2 Laboratoire des Matériaux Non Métalliques, Institut dOptique et Mécanique de précision,
Université Ferhat Abbas 19000 Sétif, Algérie
3 MATEIS, UMR CNRS 5510, INSA de Lyon, 69621 Villeurbanne, France
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Keywords: Soft thermal shock, Severe thermal shock, Glass, Mechanical strength, Weibull analysis
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Comparatively to the as received soda lime glass samples, the strength distribution after thermal shocks showed the
appearance of a second branch in the Weibull curves. This branch is observed for temperature differences (∆T) equal or
higher than the critical temperature difference (∆Tc) for both water and motor oil cooling baths. The dispersion is more
spread out in these two baths in comparison with the olive oil bath probably because of more pronounced slow crack growth
effect. The Weibull modulus varies according to the used cooling bath and the considered temperature difference.
In the case of thermal shock caused by air blast cooling at T = 20°C, a bimodal distribution is observed for only the critical
state. The initial cracking time, obtained by acoustic emission, corresponds to the unstable propagation of the most critical
defect. The number of cracks induced by thermal shock is proportional to the number of acoustic events. |
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