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What is the impact of inner sleeves on a beam ? (About Von Mises strains)

Question asked by Eugénie Pleuchot on Jul 7, 2016

I'm trying to do a modelling and a simulation of a long beam (13 meters).

Because of the efforts and the length of the beam (which is also tubular), I have an important von mises strain and a large displacement.

I thought that if I put inner sleeves, it would decrease the strain and the displacement.

But apparently, it decreases the displacement (which is logical, there is more thickness) and it increases the strain, I don't understand why...