Abstract
It is shown that the spent part in the energy balance describing the loss of stability of a sharp atomic crack in the classical Griffith criterion for fracture of brittle bodies (glasses) should exceed the quantity 2y (y is the surface energy of the metal) adopted by Griffith by an order of magnitude and be equal to 20y. In fracture of a brittle body most of this energy is lost in the form of dissipated elastic waves (sound). In the case of a macrocrack the fraction of the dissipated energy is even higher and is proportional to the radius p of the tip of the crack.
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References
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Meshkov, Y.Y. Griffith energy criterion in the fracture micro-and macromechanics of brittle bodies. Met Sci Heat Treat 38, 28–32 (1996). https://doi.org/10.1007/BF01153869
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DOI: https://doi.org/10.1007/BF01153869