6. notes

Discrepancies between the reference solutions and the code_aster solutions may stem from the insufficiently refined mesh in the particular area on the crack lip.

In addition, the transition from \({F}_{I}\) to the local \(G\) by Irwin’s formula in plane deformations is only correct at the heart of the piece, and certainly not at the end of a crack that leads to a free surface (the same is probably true for a crack opening at the interface between two materials).