I'm not entirely convinced it's a stress singularity. Based on the direction of the force, you could have high stress and deformation in that pattern. Is it steel with a yield stress around 250 MPa? It is over yield, but not excessively so. We verify stress singlarities by making smaller elements at the suspected location to see if the stress keeps going up. In non-singularities, the stress may go up but does so asymptotically, aproaching a constant value.
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