Abstract
In this study, the method of laser cutting of a glass material was studied numerically as well as experimentally. Crack initiation behavior was investigated with a glass specimen without a starter notch. Surface roughness introduced by polishing with emery papers at the specimen edge affected significantly crack initiation behavior. Initial crack length was smaller in the specimen which has large roughness at the edge. The roughness introduced by the polishing of an emery paper was considered as a crack on fracture mechanics. Crack initiation behavior was observed by a high speed camera with a specimen polished by very fine alumina powder to miler finishing in the edge. Crack initiation and propagation mechanism was explained by the results of an experiment and a thermal stress analysis.
