Holed Panel Buckling Analysis 2

[lisa247]

Hi, does anyone know where I can find an analysis method for combined compression and shear analysis of a flat panel with a circular hole?
Cheers
Lisa

 

[israelkk]

Try NASA and NACA sites

 

[rb1957]

i think i'd approach the problem as a typical diagonal tension panel problem, and reduce the allowable shear to account for the hole.

 

[RPstress]

The analysis method we always used for shear buckling was ESDU 75035, "INITIAL BUCKLING OF SQUARE PLATES IN SHEAR WITH CENTRAL FLANGED CIRCULAR HOLES (TENTATIVE)" (it never got made non-tentative). 75034, "INITIAL BUCKLING STRESS, MAXIMUM DIRECT STRESS AND SHEAR STRAIN OF SQUARE PLATES IN SHEAR WITH CENTRAL CIRCULAR HOLES" (no reinforcing flanges around the hole) is related.

ESDU also references NASA TR 132548, "Shear Buckling of Square Perforated Plates."

An FE normal modes analysis is sort of a last resort. Watch out for plasticity if metallic.

 

[lisa247]

Thanks everyone. RPstress - I have seen the ESDU pages that you have mentioned, however they only consider shear buckling, do you know if there is anything that combines shear and compression?

 

[RPstress]

I searched ESDU for buckling hole and didn't find anything for compression buckling with a hole. However, it's basic enough that there must have been a about a thousand investigations. I found one paper that I copied from the net but I've lost the URL (as usual). However, the paper is at files.engineering.com (presumably someone here has posted it for download before?) and can be found by searching in Google for "Elastic_Buckling_of_Plates_with_Hole" (include the inverted commas) and at the moment it's the first hit.

Some sort of simple interaction for the combination a^2 + b^2 as is done for bolt shear and tension may be adequate for a look-see. Finding an actual ref for the combination is harder, though I seem to remember the combination if shear and compression without a hole is well documented (in Niu?). Using that would usually be acceptable to most people.

The Google search also finds what appear to be a list of Eng-Tips postings quoted on another site. The topic seems to have been answered before. NACA WR-L-402 gets mentioned as does ESDU 02.04.05 for buckling under combined load interaction. This also refers to the files.engineering.com document, which is at

http://files.engineering.com/getfil...file=Elastic_Buckling_of_Plates_with_Hole.doc

.

 

[lisa247]

Thank you for that, I dont have full internet access at work so i will check it out when I get home

 

[rb1957]

combined compression and shear in a panel is more complex than a bolt interaction formula. it is diagonal tension, where the panel buckles and carries the shear load as tension along the buckles (as opposed to in-plane shear stress). this brings along a whole raft of other checks.

read up on diagonal tension, Bruhn, NACA 2661, 2662. the hole will reduce the effectivity of the web, initiating an earlier buckle. A Big factor in this reduction is whether the hole is flanged or not. I'd suggest replacing the plain web buckling allowable with the holed-web buckling allowable.

 

[lisa247]

It sounds like you are talking about a post buckling analysis, I am looking for a method that just looks at combined shear and compression that doesn't necessarily assume that the panel has buckled.
Cheers

 

[rb1957]

yes, but i'm not assuming that the web has buckled ... you start the post buckling calcs with the web shear and compression allowables and see where you go

 

[plasgears]

I generally eyelet holes subjected to compression. Consider the net section alongside the hole, and you have a channel of section properties you can compute. Now do a compression stability check. Used this extensively in jet engine parts.

 

[edbgtr]

Hi All
The shipbuilding and offshore rig building industry has sponsored some academic institutions to look into this topic, and some of the results can be read across, with a little effort, into our field of work. Most appear to be FEA analyses, some plain elastic, others elasto-plastic.
The following related papers can be found on the Internet, which are not behind a pay-wall.
Ultimate strength of steel plates with a single circular hole under axial compressive loading along short edges, by J K Paik, SAOS 2007 Vol. 2 No. 4 pp 355-360
Elasto-plastic buckling of perforated plates under uniaxial compression, by Khaled M El-Sawy, et al, Thin-Walled Structures series, 2004.
Effect of aspect ratio on the elastic buckling of uniaxially loaded plates with eccentric holes, by Khaled M El-Sawy, et al, Thin-Walled Structures series, 2001. (2660.pdf)
Ultimate strength of perforated steel plates under combined biaxial compression and edge shear loads, by J K Paik, Thin-Walled Structures series, 2007 (1225.pdf)
Elastic stability of bi-axially loaded rectangular plates with a single circular hole, by Khaled M El-Sawy, et al, Thin-Walled Structures series, 2007 (2636.pdf)
There is a repository site on the ‘Net with the following address where the papers given above with item numbers in brackets (parenthesis) can be downloaded.

http://202.114.89.60/resource/pdf/XXXX.pdf

just substitute the number for the XXXX
If anyone has the following paper, also done by the same team of people, but which is not yet available free on the ‘Net, I’d be obliged if you could let me know where to find it.
The elastic stability of square perforated plates under combinations of bending, shear and direct load, by C J Brown + A L Yettram, Thin-Walled Structures series, 2003
Ed.

 

[rb1957]

whilst that looked like a really useful repository, i wonder if we should be supporting Chinese copyright evasion sites ??

i suspect it is Chinese 'cause of some of the messages when you don't file in "XXXX".

if i wasn't concerned about this, i'd ask if there is a key listing ... how'd you know the XXXX number for a specific paper ??

 

[edbgtr]

rb1957

They came up in "Give me back my Google" searches, i.e everything that's available, not just what the Big G wants you to see. I did see the Chinese script come up when I tried a number that was not in use, but was not too worried about that, most of the papers presented in the Thin-Walled Structures series are from just across the sea from them, where the script is not a series of pictograms.

Ed