×
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

How to cope with a singularity in a report

How to cope with a singularity in a report

How to cope with a singularity in a report

(OP)
Hi Guys,

In my assembly i have a stress singularity in the vicinity of the contact with another part of the assembly.

This location is of interest however, there is a decent amount of stress at this particular location, that i'm sure of. The FEA results though are a direct result of mesh size, stresses go to unreal value's.

Now the question:
What is the best approach fot such a situation in a final stress report:

a) mark the location as undefined? (this seems unacceptable to me though)

b) alter the geometry of the mate / parts, so that the boundry is less stiff? (this also seems unacceptable to me, since it would be a deliberate deviation from the actual assembly)

c) somehow do a handcalc to get some ball park value?


Would like to hear how you guys deal with such situations.


Thank you all in advance!




 

RE: How to cope with a singularity in a report

Although the stress at that location is unrealistic, the question should be as to how you classify the stresses at that location. As it's equivalent to say a point load, or a zero radius fillet say, then you'd classify the stresses as a peak stress component in addition to your primary and/or secondary stresses. The stress limit depends on the classification, ie. a primary membrane stress might be limited to 2/3 yield. prminary membrane plus bending to yield, and the primary plus peak stresses are limited to fatigue considerations, if they apply.  

Hoping to say Tata  

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