薄板ガラスの熱応力割断における進展中き裂先端形状のその場観察

書誌事項

タイトル別名
  • In-Situ Observation of Propagating-Crack Front Geometry in Thermal Stress Cleaving of Thin Glass Plates
  • ウスイタ ガラス ノ ネツ オウリョクカツダン ニ オケル シンテン チュウ キレツ センタン ケイジョウ ノ ソノバ カンサツ

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抄録

Geometry of propagating crack front and crack opening displacement were observed in situ in thermal stress cleaving of thin soda-lime glass plates using the interference fringe method. The crack front inclines to the propgaating direction advancing more at the heated surface due to the temperature gradient in the thickness. Mode I stress intensity factor was estimated from measured COD and its distribution along the curved crack front was found to be almost uniform. The uniform distribution was also confirmed from three-dimensional thermal stress FEM analysis. When a crack length at the middle plane of the plate thickness is used, two-dimensional analysis gives good approximation of K_1 attained at the propagating crack front.

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