Text for buckling analysis of pressure cylinders 1

[vtmike]

Hi,

Can anyone suggest good resources for learning everything about buckling collapse analysis of thick walled cylinders under external pressures?

Thanks,
Mike

 

[plasgears]

I recall that Roark had an applicable case.

 

[JoeTank]

NASA freely publishes an old series of documents that dealt with buckling of cylinders, spheres and cones. They were numbered "SP-XXX". I used them many years ago, but found them on the internet a few years ago. These papers are based on the seminal references that most modern design codes are based upon.

Joe Tank

 

[vtmike]

Yes Roark has a formula in one of the Tables but it does not explain a whole lot. I was looking more for textbooks or published papers.

I've been searching the NASA documents, but have come across only one useful paper on the buckling collapse of a cylinder. Is there any other database other than the NASA Technical Reports Server to look for NASA documents?

Thanks,
Mike

 

[JoeTank]

Here's a website that includes SP8009, SP8019 and SP8032. Scan the document lits to be sure i gave you right numbers.

http://www.nakka-rocketry.net/sp8000.html

Joe Tank

 

[vtmike]

Thanks,

But none of the papers deal with buckling of thick walled cylinders. I cannot come across any text that explains buckling due to instability in thick cylinders.

I am trying to find the buckling modes due to external pressure in FEA. In order to do so, I need to apply an initial deflection or initial load. How do I calculate this load?

 

[rb1957]

if you have an application in mind, don't you know the pressure to apply ? is your structure a plain shell (unlikely), or stiffened with frames (and or stringers) ? thick plate seems alittle of an "agricultural" solution, there other options (honeycomb panel, frames, ...) that may work for you ??

 

[vtmike]

It is a thick walled tube with external pressure. The reason we are sticking to steel instead of composite materials is cost. It is not a plain shell structure and it is not stiffened in any way.

Right now I just need to find the collapse pressure, and the buckling mode. I can find the collapse pressure using FEA and hand calculations, but I am lost on how to find the buckling modes of collapse.

 

[rb1957]

a yahoo search found ...

http://cat.inist.fr/?aModele=afficheN&cpsidt=17004908

http://www.me.ust.hk/~meqpsun/Notes/Sylla202.pdf

(which high-lights a text "advanced mechanics of materials" by Cook and Young)

 

[TGS4]

Why not try ASME Section VIII, Division 2, Part 5, Article 5.4? This is how the pressure vessel people (often people who make thick-walled vessels) examine buckling failure.

 

[desertfox]

Hi vtmike

see if this site helps:-

http://darchive.mblwhoilibrary.org:...912/1427/1/Technical Memorandum WHOI-3-81.pdf

desertfox

 

[vtmike]

TGS4,

The ASME code gives me formulaes to calculate buckling but does not explain the theory of collapse instability in thick walled cylinders.

desertfox,

The link in your post does not work?

Thanks,
Mike

 

[desertfox]

Hi vtmike

I tried the link and it works for me, you have to give it a minute or so to download.

desertfox

 

[TGS4]

vtmike, Article 5.4 does not give formulas for buckling collapse, but margins for the various analysis procedures.

I guess I don't understand what you are trying to figure out. You either have elastic (Euler buckling), plastic collapse (yielding), or something in the grey area in between.

If I look back at your 3 Mar 09 13:39 post, if you follow the analysis procedure in Article 5.4, you will find your answer.

The reason that there are different design margins in Division2 for the different analysis procedures is that each analysis procedure is unique and has strengths and weaknesses for estimating the buckling collapse load.