Simple Pin in hole problem? 1

[PuzakDW]

I have been trying to analyze a simple pin in hole problem in mechanica with little success. I am trying to analyze a profiled aluminum eye being pulled by a steel turnbuckle pin with a smaller diameter. I am applying a force to the pin however the static analysis is saying the pin is unconstrained. What am I doing wrong?

I've tryed the analysis with a bearing load on the inner surface of the hole, but this is not an accurate representation. When I viewed the anlysis i could not determine what the stress was on the profiled surface since there was high stress at the holes inner surface. What is the best way of determining the exact stress at certain points, not just the stress range?

 

[seymours2571]

If the surfaces of the geometry are not touching then Mechanica considers them to be free from one another. It sounds to me the surfaces are not touching and do not have contact surfaces established between them.

STeve


Stephen Seymour, PE
Seymour Engineering & Consulting Group

http://www.seymourecg.com

 

[Twoballcane]

Shouldn’t you be more concern what the max stress you will be encountering than stress at certain nodes (which I think ProM does not do, but I could be wrong)? You should be calculating the Von Mises stress so you can compare to Sy and Su. What did your hand calcs come out to?

Tobalcane
"If you avoid failure, you also avoid success."
“Luck is where preparation meets opportunity”

 

[seymours2571]

To determine the stress at specific locations you can employ either one of the following methods:

1) Create a measure at the specfic location using a datum point as a reference prior to starting the analysis.

2) Use the dynamic query option within the results viewer.

Steve


Stephen Seymour, PE
Seymour Engineering & Consulting Group

http://www.seymourecg.com

 

[PuzakDW]

Thanks Steve,
Will do, when I get back to this. I'm new to the program so I had a few issues with the datums and constraints, but I'm starting to get the hang of it.

Tobalcane,
The max stress I was experiencing were on both edges of the hole (4x hand calcs). May hand calcs were much closer to what I saw on the color range for the outside surface. Slight inner hole deformation is not a concern for my application.