Difference between Euler's critical load and Buckling Analysis "F" parameter
Hello, all
I've got a trussed structure I'm woring on, but when I call a buckling analysis, it gives me this result:
But, when I extract the element forces via ELFORCE, it gives that, in that particular member, Ive got a 167N force, which I used to calculate manually Euler's critical load. Pcrit equals 42N, but the F paramenter in OptiStruct (which should give the ratio of Euler's load with the acting load) gives me a far lower ratio. Any clue why that is?
thanks in advance!
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Hi,
are you sure the boundaries of your bar are exactly as the euler's assumption?
the stiffness of the connections might be influencing your response.
well, I'm modeling the bar as a pinned-pinned bar, and applying the corresponding Euler equation. Could the connections not act as a pinned condition?
If we're assuming a pinned-pinned bar, we have that (for the first mode and with my conditions):
where EI = E*I = GPa * m^4 and L is in meters
But in the model I extract a 167,1N using ELFORCE.
Could I be wrong in my assumptions and HyperWorks uses another method to calculate it?
Hi,
are you sure the boundaries of your bar are exactly as the euler's assumption?
the stiffness of the connections might be influencing your response.