Valid extractions of stress intensity factors (SIF) via the Fracture or Points tabs are as follows:

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When extracting stress intensity factors (SIF's or K's) along a crack front that has been automeshed with tetra elements, the recommendation is to have two layers of refinements close to each other to reduce the aspect ratio of the tetras in the region of extraction; this mesh refinement strategy will minimize the mapping effect in the results and is applicable both for SIF and J-integral extractions.

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The nature of the singularity changes as you approach a free edge – then there are both the edge and the free face corner singularities.

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