H. Awaji et T. Endo, THERMAL-SHOCK FRACTURE TESTING FOR FLOAT GLASS BY INFRARED RADIATION TECHNIQUE, Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 103(9), 1995, pp. 960-965
An infrared radiation heating method was proposed previously as a new
technique for estimating thermal shock resistance of ceramics, and a c
oncept of thermal shock fracture toughness and stress intensity factor
s for a disk-shaped specimen with an edge crack was expressed. The met
hod uses a thin circular disk. which is heated by infrared ray at the
central area with a constant heat flux. The technique makes it possibl
e to evaluate the thermal shock strength, R(1c), and thermal shock fra
cture toughness, R(2c), directly from the electric power charged and t
he time to fracture, despite the fact that R(1c) and R(2c) consist of
the thermal properties of the material tested, In this report, the the
rmal shock strength and the thermal shock fracture toughness for float
glass at room and high temperature are evaluated by the infrared radi
ation heating technique, and shown as a function of temperature when t
he specimen failures. The thermal shock parameters obtained experiment
ally are also compared with the estimated values which are calculated
by combining the temperature-dependent mechanical properties of float
glass.