Thanks for the comment John.

Hi Marina, when a bolt clamps 3 plates together instead of 2 plates as shown in this video, the middle plate has a clearance hole and is held in place by frictional contact with the top and bottom plates. The bolt does not interact with the center plate at all. This assumes that the clamping force of the bolt and the coefficient of friction are high and the shear force on the middle plate is low so that it does not slip. If that is not the case, then I would add frictional contact between the side of the bolt and the middle plate hole to support the middle plate shear force on the side of the bolt after the parts have slipped. Generally, joints that allow slippage are unacceptable with rare exceptions.

Ok...Two things...1 - My hug stress level is a singularity due to the way I need to apply preload in Nastran. 2 - The author has shown X-axis directional displacement instead of Total displacement. My Nastran outcomes align nicely now. Fields looks similar, however displacement calues are a bit different in X direction, range = -0.16 to +0.0187 compared to author's -0.1 to 0.023

When I model a bolt preload for a bolted joint, I generally don't look at the stress in the bolt because I idealize the bolt leaving a sharp interior corner that creates a singularity. I use a separate Excel spreadsheet for bolt stress calculations. The Ansys model is used to evaluate the stress in the two parts that are being loaded after being bolted together.

I use a SpaceMouse. 3dconnexion.com/us/

Hi @baslord88, it may be that the design study parameter causes the surface to which the fixed support was scoped to be consumed in the shape change driven by the table. Go to forum.ansys.com/ where you can join for free. In the General Mechanical channel, Start a New Post and insert screen snapshots of your geometry and show how the parameter changes the shape. It will be easier to have a discussion on that forum.

use slice tool in soldiworks and then loft feature to connebt the sections

@@ansysfeaexamples9351 Thank you very much, now that I have finished the ligaments I am asked for the cartilage, you rather said that CT scans were needed, is that the only solution? I had thought of doing a Boolean operation between 2 shells but the result is not satisfactory

@@nathancollard9591 You could create a disc of material about the right diameter but much too thick and subtract where the bone intersects the disc to make an approximation of the cartilage.

The formula you show is for Euler beam theory. Ansys uses Timoshenko beam theory in their beam elements. If you use a Timoshenko beam theory formula, you will get the same answer as Ansys. Or you can use an obsolete beam element that uses Euler beam theory then Ansys will match the answer you got.

@@ansysfeaexamples9351 yeah but i think the major problem was that I applied the load at the centroid and not at the shear center and so the analytical solution did not consider the rotation of the the midline due to torsion

@@francescoindolfo Good find.