"Jahan" wrote in
message
oupdirect.com...
8 cm wide by 3 cm U Channel and 3 x 3 inch x 2 mm tube
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for full context, visit
https://www.polytechforum.com/metalw...ng-649641-.htm

There are many web sites like this with strength calculators and
material properties.
https://www.roguefab.com/tube-calculator/

You need some familiarity with the mathematics and vocabulary of
"Statics" to make good use of them.
https://en.wikipedia.org/wiki/Statics