Join Thom Tremblay for an in-depth discussion in this video Comparing contact options, part of Autodesk Inventor Professional: Stress Analysis Tools.
- The process for executing a stress analysis inside of an assembly with Autodesk Inventor Professional is essentially the same as a part model. There are a couple of unique considerations. The primary one to focus on is contacts. Contacts control how the two parts either remain stuck together, can slide across one another or can, perhaps, even separate as stress is applied to the assembly. Another consideration is what components you might not need to include in the stress analysis.
For example, I have a simulation set up, but because I was able to use the design accelerator and validate that this particular bolt is strong enough, I do not need to include it in this simulation, so I can just simply select Exclude From Simulation and the two bolted connections are no longer part of this model. Now I can tell it to search for Automatic Contacts. This is a step that is required before applying manual contacts. By default, Inventor will insert a bonded contact between parts.
That means that those parts are stuck together in that position. If I review the two bonded contacts that were applied, one is between the lower pad and the wall, and the upper is the top part that will be bolted to the wall and the wall itself. That's great. However, the lower one I want to be able to slide, if necessary. This way I can decide if, perhaps, a third screw is required to hold this in place. I can double-click on this contact and take a look at the options.
Looking at the various options, to me, Sliding with No Separation, as I anticipate this pad would stay in contact with the wall but be able to move, seems like the appropriate one. So I'll simply change that Contact Type and it will update my model. Next, it's the same considerations as you normally have, such as fixing the wall in place. We'll assume that that wall is permanent. Then let's apply our load. In this case, I wanna apply a Bearing Load to the cup of this hanger.
I'll establish my direction and then establish the weight that will be applied to it. In this case, I want to apply 30 pounds of force. I really only need this to hold 10, but just to make sure if someone hangs a heavy coat or a bag, that this hanger will still work. We'll say OK, and let's go ahead and Run the simulation. We're able to get our result. It is fairly high stress, but if I look at my Safety Factor, while it's somewhat minimal for what I'd like to have, it's still within an acceptable range.
The Displacement is also higher than I would like to have, but I think we'll be able to live with it. Perhaps I'll go back and make some modifications to my design now that I have more information. I can start doing some experimentation. But this initial look is okay. Now I'll be able to collaborate with others to make a decision on what to do next. It's important to spend time getting to understand how these contacts work and think about the real-world environment for your assembly to make the best choices.
- Accessing simulation tools in Inventor
- Assigning materials
- Setting loads and constraints
- Generating a mesh
- Running and reviewing the analysis
- Analyzing parts
- Working with assemblies
- Animating results