1. But

Calculate stress intensity factors in 2D and 3D.

This operator makes it possible to calculate \(\mathit{K1}\), \(\mathit{K2}\) in 2D (models “D_ PLAN “, “C_”, “C_ PLAN “and” AXIS “) and \(\mathit{K3}\) in 3D (modelling” 3D “) by extrapolating the jumps in movements on the lips of the crack, cf. [R7.02.08]. This method is only applicable for homogeneous and isotropic materials.

This operator can be used both for a meshed crack and for a non-meshed crack (method X- FEM). In the case of a mesh crack, it must be flat.

The method used is theoretically less precise and more sensitive to the mesh than the calculation based on the bilinear form of the energy restoration rate and the singular displacements, usable in 2D and in 3D with the option CALC_K_G of the operator CALC_G [U4.82.03]. However, it makes it easy to obtain a good estimate of stress intensity factors.

Produce a table-like concept.