I was doing a loading analysis on a frame to check how much deflection one of the members would experience, and I noticed the result seemed off by about an order of magnitude from what I expected. I decided to take things down to the most basic level, and isolate just the beam. I fixed it at both ends for the simulation and applied 100 lbf at the center of it, by sketching a small rectangle and then using the split line feature to allow me to place the load only there.

Then, I compared the result of my simulation to hand calculations (Beam Bending Equations Calculator Supported on Both Ends Single Load at Center | Engineers Edge )

My simulation indicates a maximum deflection on the beam of .0058 inches, whereas the calculations indicate a maximum deflection of .023 inches. I'm using the 6105's elastic modulus as indicated in SolidWorks and the area moment of inertia for a square beam with a width of 1.5". I'm not sure why this discrepancy in the maximum deflection occurs.

I have attached the file of the beam with the static simulation.

The problem you're getting is with the fixtures. The "Fixed" fixture in the SOLIDWORKS Solid static simulation fixes translation as well as rotation. But if you look at the calculator it uses supports to fix the translation, but keeps rotation free. This means that you need to run it as a beam study and use the "Immovable" fixture. Also your split line to apply the load was incorrect I believe, I recreated it as a just a vertical line up the middle of the beam, then changed the force applied to 50 to each vertex on the split line.

I get a result of 0.00059 m and the calculator gives 0.00051m. I have reattached the file with my static study for you to have a look.

Hopefully this has helped,

Chris

Edit: Attached now, Accidentally did it all in 2017 and realised afterwards you only have 16. Also if I change units to in the deflection is 0.023".