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김홍석(Hong-Seok Kim),박상후(Sang-Hu Park),유범열(Bum-Yul Yoo),하병국(Byung-Kuk Ha),이승주(Seung-Ju Lee),홍정욱(Jung-Wook Hong),신아연(Ah-Yeon Shin) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Bending strength of glass is dominantly determined by surface crack. In this respect, characterizing the resistance to surface cracking is very important in predicting the life of a glass. For this purpose, Vickers indentation was performed according to indentation load and dwell time for annealed and tempered glass. For both glasses the size of impression generated by Vickers indenter was approximately the same regardless of the dwell time but increased with the indentation load. Particularly, in annealed glass, radial cracks were additionally created at the vertices of impression. In tempered glass, on the other hand, only impression was created, which seems to be because the compressive residual stress on the surface of tempered glass prevented the radial crack from propagating. Consequently, tempered glass has better resistance to surface cracking than annealed glass, and it appears that the higher the compressive residual stress, the better resistance to surface cracking.