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Free-body diagram for beam element. (partial derivatives)
https://www.engineersedge.com/engineering-forum/showthread.php/5870-Free-body-diagram-for-beam-element-%28partial-derivatives%29?goto=newpost
Wed, 06 May 2020 08:47:04 GMTHi, could anyone explain me where do forces correlated with partial derivatives come from? (marked with a red circle in the figure). What is the...

Hi, could anyone explain me where do forces correlated with partial derivatives come from? (marked with a red circle in the figure). What is the formula to prove it?
Thanks :)