×
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 stress composite lugs?

How to stress composite lugs?

How to stress composite lugs?

(OP)
For metallic lugs design guidelines are available (eg. Niu). However, these can not be directly used in composite lugs.

Does anybody know of design guidelines or methods to analyze composite lug?

I am analyzing a 3D composite (carbon/epoxy) lug.
This thick laminated lug (17.5 mm) has a hole with a spherical bearing installed. The lug consists of 50 plies of SM_5H_Satin fabric. The lay-up is quasi isotropic.

The analyses were performed using finite element method (I am still looking for correct 3D material values see thread327-228660: Out of plane properties for satin weave). Later, we will perform physical tests to correlate the results.

The papers that are referenced in thread181-27567 are interesting but do not give sufficient answer.

Regards, Tom.

RE: How to stress composite lugs?

The only open literature references for composite lug methods that I know about are:

C. Kassapoglou, "Failure Prediction of Composite Lugs Under Axial Loads", AIAA Journal, Vol. 41, No. 11, November 2003.

M. Wallin, "Load Response and Failure of Thick RTM Composite Lugs", In Proceedings of ICAS 2002 Congress.

I have been dealing with composite lug analysis for the past several years.  Analysis methods need to consider each potential lug failure mode:  net tension, bearing, shear-out, cleavage, bending, delamination.  The current methods are all essentially empirical.  Test data is required to validate the methods.
 

RE: How to stress composite lugs?

(OP)
It surprises me that only few articles are available.

Here's another interesting paper: http://paginas.fe.up.pt/demegi/Avaliacao/Pp_Camanho_Mathews_99.pdf?

Professor Matthews did quite some work on composite joints a good reference is: Matthews, F. L. Joining fibre-reinforced plastics / 1987

Tom

RE: How to stress composite lugs?

Yes, there are lots of bolted joint references in the literature, some useful, most not.  But lugs are very different things from typical bolted joints.  Lugs are too practical and complicated for research projects, so most lug development has been done by companies, and thus the data and methods are proprietary.

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