Abstract
Wheel scribing is a technique widely used in dividing glass substrates. However, the optimization of scribing conditions and tool geometry depends on empirical rules because the dominant factors of crack generation and fracture surface formation are not fully understood. The present study visualizes the crack generation/propagation behavior in the contact area between the scribing wheel and glass substrate employing high-speed imaging. Median cracks appeared under the wheel when the wheel came into contact with the glass, with the cracks being located on a single plane. The fracture surface morphology depended on whether the median cracks were connected with each other. We discuss the formation mechanism of the fracture surface on the basis of the observations of crack generation/propagation behavior.
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