Digital Repository, Giornata IGF Forni di Sopra (UD) 2011

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Characterizing mixed mode brittle fracture using near crack tip stress fields
M.R. Ayatollahi, D.J. Smith, M.J. Pavier

Last modified: 2011-02-25


We describe the formulation of a generalized maximum tensile stress criterion used to predict
brittle fracture under combined tensile and shear (mixed mode) loading. The criterion uses approximate near
crack tip stresses. We demonstrate its applicability to a range of materials exhibiting brittle fracture. Fracture
data from a number of well known mixed mode fracture specimens such as the cracked Brazilian disc, semicircular
disc, four-point bending beam, and cracked plates are used to validate the criterion. Characterization of
the crack-tip fields is carried out numerically to determine tensile and shear stress intensity factors and T-stress
for each specimen. Test results show that different specimens provide different fracture behavior because they
exhibit differing values of T-stress for the same tensile and shear stress intensity factors.

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