Pull Through of Fasteners in Thin Sheet Part 2.

[MaterialFailure]

In this thread:

thread725-211530

the OP asked "What load is required to pull X size fastener through Y thick aluminum cladding?".

I was wondering if the OP (GrimesFrank) or anyone else had gotten anymore answers on this issue? I know FEA was suggested but a formula, chart or similar based on empirical data would be good to obtain a quick result.

This seems to have been at least partially addressed in Aluminum Structures By J. Randolph Kissell, Robert L. Ferry page 286. See this link:

http://books.google.com.au/books?id...&oi=book_result&resnum=10&ct=result#PPA286,M1

Cheers
Andrew

 

[GrimesFrank]

Andrew,
I crossposted the topic;
Pull Through Strength - Aero

Nothing came of this which at the time I thought would be a no brainer.

Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel

 

[unclesyd]

You could get good idea of the resistance to pull out/push out if you compare the head diameter of the clinch nuts and studs.

http://www.captive-fastener.com/catalog.html

http://www.camcarsolutions.com/clinch.asp

 

[MaterialFailure]

Thanks for the replies so far.

The formula in Aluminum Structures By J. Randolph Kissell, Robert L. Ferry page 286 seems to be saying that it is the force required to tear the radial length of material between the hole diameter and the diameter of the bolt head x thickness of material.

This seems simplistic but not entirely unreasonable, at least when the material is thin and the bolt head thick as I can imaging the material buldging up and then tearing in that manner to let the bolt head through. But would it be one simple tear? It may well petal out with multiple tearing.

 

[MechEng2005]

I suspect that after one tear formed, more tears would not be long in coming.

 

[unclesyd]

Here is a short cut to figuring the approximately pull through of a fastener, round or hex head, while the fastener is normal to the surface. Use the first chart for tonnages for steel and use the multiplier from the second address. Any angle imposed on the fastener will throw off any calculation.

http://shopswarf.orconhosting.net.nz/tonnage.html

http://www.knighton-tools.co.uk/acatalog/pp.pdf