Fastener Flexibility (Geoff Morris TU Delft paper) 1

[thagomizer]

I am looking for the thesis paper by Geoff Morris at TU Delft called "Defining a standard formula and test method for fastener flexibility in lap joints" which compared various fastener flexibility formulas (Huth, Tate, Grumman, etc). It used to be on line, but now I can't find it, only a word document posted on this forum in 2007. Does anyone out there happen to have a copy?

 

[WKTaylor]

Thagomizer...

Suggest You take a look at Eng-Tips Thread

http://www.eng-tips.com/viewthread.cfm?qid=192705

.

This same 'G Morris paper' is discussed and someone indicated availability.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]

 

[thagomizer]

Right, thanks wktaylor. That thread is the one to which I was referring. A user named "mohr" said he had a copy. I've never used these forums before-- is there a way to contact him (PM,etc)?

 

[LiftDivergence]

Are you looking for something specific that you remember seeing in this paper?

I ask because if you continue to draw a blank on finding a copy, there are other papers which make comparisons as you mentioned. If you are just looking for the form of the published equation, that can also be found elsewhere.

There is a paper by JJM de Rijck, also from TU Delft I think, which is broader in scope but covers off the implications of fastener flexibility in relation to damage tolerance. This paper is easier to find.

You mentioned the Grumman, Huth, and Tate and Rosenfeld equations. The earlier papers like Huth make comparisons of accuracy. There are also some Boeing D6 docs about flexibility if you possibly have access to those. In my experience the Tate and Rosenfeld equation tracks directly with the first form of the Boeing equation.

I have done some work in the past creating a joint load transfer spreadsheet tool which allows for selecting different flexibility equations for the solution. In my experience, the Swift formula will produce in general, the stiffest fasteners, and the Grumman equation will predict the most compliant fasteners.

I'm not exactly sure where the Delft equation would fall in terms of stiffness prediction. However, if you are modelling load transfer, depending on your situation, the most conservative formula to use will likely be Swift or Grumman. Delft is likely to fall somewhere in between (just coming from personal analytical experience).

Keep em' Flying
//Fight Corrosion!

 

[WKTaylor]

thagomizer...

Contact forum managers and then explain that You would like to contact another member [who, what, why, etc]. IF the managers agree they will contact the other member and ask them if direct contact is acceptable [who, what, why, etc]. The other member has the right to accept or reject this contact.... or perhaps indicate some other plan of action; such as where to find the document... back thru the forum managers.

NOTE. University libraries usually have access to documents like thesis, etc, and MIGHT be able to help You obtain a hard copy.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]

 

[Andries]

thagomizer,

Google "TU Delft Repository" and enter keywords.

I hope this will get the report.

andries