セラミックスのレーザー熱衝撃による亀裂の生成・伝播挙動

概要

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The laser-induced thermal shock test and thermal stress analysis by a finite element method were carried out for explaining the generation and propagation behavior of thermal cracks in ceramics such as silicon nitride, alumina and zirconia caused by high-power-laser irradiation. Different features of crack propagation were observed depending on the ceramic species, probably depending on their thermal properties. Maximum tensile stress in every axis direction was observed at certain locations, where the stress intensity factor was also largest. It was found that cracks might generate right under the center of a heat source circle and at the outside of the circle, and might propagate from righ under surface towards the radial direction. The initial point of cracks seems to be grain boundary phases which soften at high temperatures.
社団法人日本セラミックス協会の論文
1993-05-01