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I was wondering could I get some help with determining the experimental critical buckling load of a pinned ended strut. I am hoping to compare predicted values from Euler buckling and Perry Robertson to experimental values. I have carried out a experiment where by I applied a axial load to the strut and recorded both the horizontal and vertical displacement. From this data can I apply a formula to give me the critical buckling load? Or is the critical buckling load simply the highest value recorded in the experiment?

Thanks for any help!