Hello all,

I am looking at a very simply weldment structure. The material is set to the Solidworks ASTM A36. I saved the weldment as a simplified part with one body. 

The part is constrained with Fixed Geometry to simulate its welded connection to a larger, relatively rigid body on either side.  

The applied loads are standard gravity and a remote load with rigid connections. The load produces expected torsion in part. The displacement plot passes the sanity check and the stress plot looks okay; however, the Error plot looks very strange. I have read several different thoughts on the use and application of the Error plot and the conclusion I came to is that the results should indicate 5% or less for acceptable confidence. 

Irrespective of this, I simply cannot wrap my head around the plot itself in this case. I have been including this plot in my simulations for some time now and have never come across something like this:

Does anyone or has anyone experienced a similar result? What would an adequate explanation look like?