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Abstract

In the present paper, attempts are made to develop a torsion fracture model for notched elements of brittle materials. Based on the theory of brittle fracture due to Griffith, a formula for the torsion notch strength of a brittle material is thus derived. Observations of the fracture mode show that torsion fracture of both smooth and notched specimens of the inorganic glass tested is typical brittle fracture. Experimental results for torsion fracture strength determined by testing smooth and notched specimens of the brittle inorganic glass are summarised and applied to check the applicability of the abovementioned model. Moreover, it is noted that the torsion strength of a brittle material is not a material constant but dependent on the specimen geometry and fracture toughness. Expressions of torsion notch strength of brittle materials with given survivability are predicted from the probability distribution parameters of torsion fracture strength and the formula for torsion notch strength, and are in good agreement with experimental results. In engineering applications, expressions of torsion notch strength of brittle materials with given survivability could be used as failure criteria in the design and reliability assessment of structural members made from such materials.

Keywords

BRITTLE FRACTURE BRITTLE MATERIAL TORSION FRACTURE STRENGTH TORSION NOTCH STRENGTH INORGANIC GLASS FAILURE CRITERION SURVIVABILITY

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Fracture and strength of notched elements of brittle material under torsion

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