How Do J.B. Johnson and Tetmajer's Buckling Formulas Differ?

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MatsNorway
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Hi Guys.

I was wondering if anyone had any info about buckling and the different formulas used. My school book had Tetmajer referenced but it seems a J.B. Johnson is also used a lot. So..

1. What are the difference in the formulas they use?
 

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The most comprehensive ever resource on buckling in the whole internet is there: shellbuckling.com
 
That is a messy page! But the /links page got more than i can look over in a day.. so thanks.

But i would prefer ofcs some non math talk about the topic. I see very little discussion around it with google.
 
I am still curious about this if there is any mechanical engineers/building engineers out there that has experience in the field
 
J.B. Johnson I know; Tetmajer I've never heard about.
 
J. B. Johnson is an empirical approach to dealing with buckling for small values of the slenderness ratio.