Abstract
Aim of the present paper is to introduce a new failure criterion in the framework of Finite Fracture Mechanics. Criteria assuming that failure of quasi-brittle materials is affected by the stresses acting at a finite distance from the crack tip are widely used inside the Scientific Community. These approaches, in addition to some others, can be grouped together under the general term of Theory of Critical Distances (Taylor [1]), in which linear-elastic analysis is combined with a material-dependent critical length parameter. The relevant length parameter is assumed to be a material constant: it generally approximates a microstructural length in the material such as the grain size.
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