106 熱応力によってガラス板に生じる波状き裂の伝播

概要

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It is well known that when a uniformly heated glass plate is lowered into cold water gradually in its in-plane direction, sinusoidal cracks often propagate due to thermal stress. The object of this study is to clarify the mechanism of the propagation of such sinusoidal cracks. Experiments were conducted changing the temperature and the descent speed of the glass plates. It has been observed that the larger the descent speed of the glass plate is, the larger the wavelength of the sinusoidal crack becomes. Furthermore, the stress distribution of the glass plate was calculated in order to investigate the effect of thermal stress on the crack propagation. At the first stage of the stress analysis, no cracks were assumed in the glass plate. The principal stress distribution suggests that cracks may propagate vertically below the surface of the water but that cracks turn to the horizontal direction after crossing the surface of the water.
社団法人日本機械学会の論文
2003-10-17