For every simulations that I do, the nodal stress is always double the element stress,especially at high stress area, e.g. 220 and 470N/mm^2 see attached photos. I am confused of which value should I use to compare with yield stress.
I have done some research on this problem and it seems this problem was due to low mesh density. However the result has not been improved even when I double the mesh density at the high stress area.
Is it normal for the nodal stress to be double the element stress?
Thank you very much
The rigid elements you are using to model the pin have infinite stiffness. This generates a natural stress discontinuity at the location where they attach to the structure.
If you set the color bar range the same between the two views (0 - 221 MPa), or probe 1-2 nodes away from the rigid element attachment locations, you should see very similar values.