Abstract
The singular stress field arising from a sharp V-notch is fully determined apart from an amplitude factor Q I, often denoted notch intensity factor. Several authors have shown the usefulness of Q I for fracture assessment of brittle materials with sharp notches and for estimating the maximum stress in rounded notches. Due to the lack of available numerical results for Q I, a method for estimating Q I for engineering purposes is of interest. In this paper upper bounds for the notch intensity factor for some geometries are presented. It is shown that such upper bounds can be used, together with the stress intensity factor K I, in a general interpolation formula for Q I( ϕ), where ϕ is the opening angle of the V-notch. In addition, values of Q I for the double-edge notched tension specimen are presented for a wide range of notch angles and notch depths.
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