×
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

2 Hole Concentration Factor

2 Hole Concentration Factor

2 Hole Concentration Factor

(OP)
I have recently seen an Airbus Excel spreadsheet that predicts the maximum Kt factor for two dissimilar diameter holes at variable distance and angle orientation in a plate for a uniform direct and shear stress conditions.

There is no reference to the source document for the calculation method.

An internet search has shown many documents with titles that sound interesting but without any way of actually seeing if they are relevant to finding the method. As they cost $20-$40, it would be very expensive to look at them all and perhaps find nothing.

Can anybody help by suggesting possible sources of information for the method? Perhaps it is Airbus "internal", thus not published.

Any help would be appreciated.

Stresscalcs

RE: 2 Hole Concentration Factor

How about Peterson's Stress Concentration Factors? There is some data there.

If you don't have that, a free source is from my dissertation:
https://dspace.uta.edu/bitstream/handle/10106/767/umi-uta-1969.pdf?sequence=1

Starting from figure 5.3, there are various loading conditions and hole sizes. You will want to look at the (25/50/25) laminate, which is equivalent to an isotropic material.

There is additional raw data starting in Appendix C. In fact, it may be a better resource than Peterson since there are many raw verified raw data points.

Brian
www.espcomposites.com

RE: 2 Hole Concentration Factor

P.S. If you are looking for a general method, rather than graphs, there is no "simple" solution. They will all need to have some numerical approach, such as the boundary collocation solution I used. An automated FEM solution would also be possible. I believe I discuss the options in the paper above.

Unless the holes get quite close or are very unequal, there is generally little interaction. That is for open holes though. Loaded holes are more "interactive", but that is another story.

Brian
www.espcomposites.com

RE: 2 Hole Concentration Factor

as Airbus is European, I expect they use ESDU more than the other side of the pond ...

RE: 2 Hole Concentration Factor

In addition to Peterson, ESDU 75007 is a good reference. It covers two holes with diameter ratio up to 1:10, for shear and normal stresses, but only for angles 0 / 45 ( / 135).

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