L. M. Li, Q. Y. Xie, X. D. Cheng and H. P. Zhang (2012) Cracking behavior of glazings with different thicknesses by radiant exposure. Journal/Fire And Materials 36 264-276. [In English]
Web link: http://dx.doi.org/10.1002/fam.1108
Keywords: glazings, radiant exposure, cracking, time to first crack, RADIATIVE HEAT-TRANSFER, INDUCED THERMAL FIELDS, WINDOW GLASS, FIRE, PERFORMANCE, ENCLOSURE
Abstract: Fourteen experiments on cracking behavior of glazings with thicknesses of 3, 6, 8, and 10mm by radiant exposure were carried out with a new experimental apparatus. The radiant power was controlled proportional to time square to simulate a time-squared growth fire. An infrared thermal imaging camera was employed to monitor the temperature field of the unexposed glazing surface. Other important parameters including incident heat flux, local gas temperature, exposed surface temperature, and time of the first cracking were obtained. The relationship between the cracking behavior and glazing thickness was analyzed based on the experimental results. The results show that the protected edge temperature of glazing has a considerable rise when the first cracking occurred, which should be included in further modeling. It was also shown that thicker glazings have smaller surface temperature during the heating process and induce longer time to first crack. However, the critical temperature difference approximately remains constant for all glazings studied. Copyright (c) 2011 John Wiley &, Sons, Ltd.