Hydraulic cylinder buckling according to DNV code 2009

[cherish]

Good morning all,

I know this topic has been discussed around but all threads mostly locked. What I am confusing is Euler buckling check for a pinned-pinned connection of rod in fully extracted cylinder on chapter 3.7.4 is Peu = pi^2*E*I/(2*L^2), from other sources the formular is Peu = pi^2*E*I/L^2 (effective length factor k = 1). Does it mean that they devided by 2 for safety factor purpose? The link of code shown in below:

https://rules.dnvgl.com/docs/pdf/DNV/tap/2009-10/TAP5-778-93.pdf

Sorry if my post is not very clearly.

thanks a lot for your kind help!

 

[JStephen]

I don't know. Dividing by a safety factor there doesn't make sense because they're comparing it to the ultimate load, not to the allowable load- putting a SF of 2 there would give an overall SF of 8.