Open AccessMorphology of Cleaved Surface and Observation of In Situ Crack Propagation During Cleaving
Author(s) -
Soshi Iwatsuki,
Hirofumi Hidai,
Satoshi Matsusaka,
Akira Chibá,
Noboru Morita
Publication year - 2021
Publication title -
international journal of automation technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.513
H-Index - 18
eISSN - 1883-8022
pISSN - 1881-7629
DOI - 10.20965/ijat.2021.p0483
Subject(s) - cleavage (geology) , materials science , composite material , laser , enhanced data rates for gsm evolution , fracture mechanics , crack closure , in situ , optics , sawtooth wave , polarization (electrochemistry) , fracture (geology) , chemistry , physics , telecommunications , organic chemistry , computer science , computer vision
In laser cleaving, the thermal stress caused by laser heating and water-jet cooling propagates previously induced cracks in the workpiece material. The laser-cleaving conditions affect the quality of the fracture surface, and therefore, elucidating the relationship between the cleaved surface, cleaving conditions, and crack propagation is essential. Against this backdrop, in this study, we investigated the morphology of the cleaved surface and visualized the crack propagation and stress in situ using a high-speed polarization camera. The distance between the glass edge and cleaved surface was varied. When the laser-cleavage line was close to the glass edge, twist hackles were formed on the cleaved surface. The area in which the twist hackles formed on the cleaved surface coincided with the lagging section of the crack front. Furthermore, the twist hackle reached the specimen surface, and the edge of the surface exhibited a sawtooth shape. Observations with the high-speed polarization camera revealed that the internal stress was asymmetric with respect to the crack when the twist hackles were formed.