Linear beam model

[Nicolas CORTES]

Hello !

I would like to compare the behaviour of a linear beam model versus the corotated Euler Bernoulli beam model.

Is there a linear Euler Bernoulli beam model in Chrono ?

Or is it possible to only take the first iteration of the Newton during the resolution of the corotated Euler beam in order to ignore the non linear resolution ?

I tried to set the maximum iteration of the ChTimestepperHHT to 1 with timestepper.SetMaxiters(1) but it did not worked because the timestepper reached its minimum time step...

I also tried timestepper.SetStepControl(False) and timestepper.SetMaxItersSuccess(0) but without sucess.

Thank you for your help,

Best regards,

[chao peng]

Hi Nocolas,

You might want to try using ChElementBeamEuler::SetDisableCorotate(true) in your test. If the beam structure does not undergo large rotations, the Corotated Euler Bernoulli beam element might (hopefully) simplify to the linear case. However, I cannot be completely certain of this outcome.

If large rotations are present in your system, it won't be possible to simplify to the linear case, as finite rotations are a primary source of geometrical nonlinearity.

Good luck!

Chao PENG.

[Nicolas CORTES]

Hi !
Thank you for the help !
I tried to use ChElementBeamEuler::SetDisableCorotate(true) for a straight beam and the behaviour of the beam seems linear as there is no displacement along the span direction.

However, compared to an analytical calculation (red) and results from a thesis (gray), the deflection is overestimated by the linear model of Chrono...

Best regards,

Nicolas