Fracture of Glass in Vacuum

S. M. WIEDERHORN, H. JOHNSON, A. M. DINESS, A. H. HEUER

doi:10.1111/j.1151-2916.1974.tb10917.x

Fracture of Glass in Vacuum

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書誌事項

公開日: 1974-08

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DOI

10.1111/j.1151-2916.1974.tb10917.x

公開者: Wiley

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説明

<jats:p> The fracture of 6 glasses was studied in vacuum, <10 <jats:sup>−4</jats:sup> torr (10 <jats:sup>−2</jats:sup> N/m <jats:sup>2</jats:sup> ), as a function of temperature from 25° to 775°C. Subcritical crack growth was observed in 4 of the glasses. Activation energies for crack motion ranged from 60 to 176 kcal/mol. The glasses which did not exhibit slow crack growth were “anomalous” glasses with abnormal thermal and elastic properties. Critical stress intensity factors for these 2 glasses increased ∼10% as the temperature increased to ∼600°C. It is felt that subcritical crack growth is not the result of alkali‐ion diffusion or viscous flow but rather of a thermally activated growth process which depends on the crack‐tip structure in the glass. A narrow cohesive region at the crack tip favors subcritical crack growth, whereas a wide region favors abrupt fracture. </jats:p>