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Effect of Surface Tension on the Toughness of Glass
Author(s) -
CHUANG TZEJER
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04951.x
Subject(s) - toughness , surface tension , curvature , materials science , composite material , tension (geology) , surface (topology) , toughening , mechanics , geometry , mathematics , physics , thermodynamics , ultimate tensile strength
Mechanical stresses (i.e., surface tension) inherently exist on a general free surface because its atomic structure differs from its bulk counterpart. The effect of surface tension is amplified at a crack tip because of curvature enhancement. An integral equation describing this effect on the toughness of glass is derived and first‐order approximations using a weight function technique were made. The qualitative results indicate that the geometry‐induced toughening is linearly proportional to surface tension and crack tip curvature and to the square root of crack tip zone size. An illustrative example of a recently observed crack tip in SiO 2 glass is given which shows that toughness is enhanced by ∼3 times the intrinsic K 1C value.