Video

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.

courses.ansys.com/index.php/courses/topics-in-hyperelasticity-using-ansys-mechanical/lessons/how-to-perform-curve-fitting-for-hyperelastic-material-models-lesson-1/

czcams.com/video/xhPojfnyB3g/video.html

Use DesignModeler to build geometry where a parameter can reduce the body to a size that is smaller than the location where the hole exists, and have the hole reappear when the parameter increases the body to a size that includes the location of the hole.

Apply separate Bolt Preloads to each bolt. Apply the same value of preload to each bolt in step 1. Apply some other load to the structure in step 2. Add a Bolt Probe to the Solution section of Mechanical. There you can output the Working Load for each bolt to see the individual loads carried by each bolt, which could be different. You could also put a Contact Tool in the Solution branch and plot the Contact Pressure in the interface between the parts. You may see higher pressure around some bolt holes and lower pressure around other bolt holes.

Yes you can.

Thank you sir

Sir could you send your name so I can mention it in my analysis paper

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

To check that the tubing is constrained, drag and drop a Modal analysis onto the Model cell of your first analysis. In the Modal analysis, add fixed supports to some hard points in the frame, request at least 12 modes under Analysis Setting and solve. Add 12 deformation results for the 12 modes. Any tube that is not properly connected can be seen floating around or one end may be swinging around in one of the modal results. If you built your tubing with beam elements, instead of shell elements, you will need to insert a Beam probe into the Solution branch to plot beam stresses. For more help, post a question in the General Mechanical section of forum.ansys.com/

Hello Gabriel, I have 15 videos on converting STL files into more useful geometry that is meshable. Here is the full playlist: czcams.com/play/PL3ziBY11hnD8qhdkdN2Ct42DunBdpLz1q.html Put your STL file in a .zip file and upload that to your Google Drive or other file sharing site such as OneDrive or Jumpshare. Put a link to that file in your reply here or better still, create a New Post in the General Mechanical section of the Ansys Forum forum.ansys.com/ where I check in most days.

@@ansysfeaexamples9351 Edit: I finally managed to solve the issue, thank you again for the support!

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.

Join the Ansys Student Forum to ask questions. forum.ansys.com/

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

LMAOOOO, Hunter, looks like youre trying to probe beam connections again. lol

Yes, it is possible to have cartilage between the bones. It is simply a matter of having the CT data segmented for cartilage instead of bone, then convert the STL into geometry. Ligaments are sometimes represented as springs.

@@ansysfeaexamples9351 Thank you for your answer, I had seen mentions of the springs but I was wondering if they were designed as classic springs or is it specific in the context

@@nathancollard9591 It can be a classic spring if the line of action is simply between the end points. If the line of action has to wrap around a bone, then you need a flexible body to do that then use a spring after that.

@@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.

Those are earbones from a type of bat: Rhinolophus ferrumequinum.

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.

Make sure you Check the STL and clean up any defects before you try autoskin.

The laptop has an NVIDIA Quadro K1100M graphics card, which is old and no longer made. The smooth rotation of the view is facilitated by use of a 3DConnexion SpaceMouse.