Hello Everyone,

I have done the FEA for a loading fixture and found high stress concentration at some areas as shown below. (Shaft Diameter is 17mm)

Material - 304

Yield Strength - 31.5 Ksi

Load - 250 Lbf (1112N)

Max Von Mises Stress is 47.6 Ksi and it's larger than the yield strength of the material.

I also used the following mesh control for this

Mesh Type - Curved Based Mesh, Max element size: 4mm, Min element size: 0.8mm

0.1mm mesh control at the fillet as shown below.

For the mesh control of 0.1mm and 0.5mm, results are almost the same. When I see through Iso Clipping, I could find that it's only the outer surface of the small fillet where the stress is greater than 30 Ksi as shown in the above figure.

I know I can eliminate this by adding a lager fillet but I doubt whether this is really happening in the real world. I am already using a machined part with this configuration. I have also applied loads little larger than 250Lbf to the part cannot see any cracks or permanent deformation of the .

I need to know whether FEA shows approximately real values or this is a stress singularity that can be ignored. Pls advice me.

Thanks,

Nilanga