×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Simple Pin in hole problem?

Simple Pin in hole problem?

Simple Pin in hole problem?

(OP)
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?

RE: Simple Pin in hole problem?

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
www.seymourecg.com  

RE: Simple Pin in hole problem?

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"  

RE: Simple Pin in hole problem?

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
www.seymourecg.com  

RE: Simple Pin in hole problem?

(OP)
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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources