review papers on stress singularity identification and characterization, GB Sinclair et al.:
Singular/nonsingular behaviour transition in a cantilever beam
slight perturbations of the theoretical clamped/free limit angle
Figure 2d, p.6 sinclair_ii pdf, κ=2; actually plane strain, $\nu=0.3$, critical angle from eq. (2.19).
A questionable ball bearing modeling for axle support
spot welding on a thin walled profile in torsion
steel, 80x80mm square section, 2.5 mm thickness.
modeled portion: 40mm in the axial direction, with 1 spot weld whose nominal diameter is 4mm.