ramp or step input?

[maxibonne]

In a static structural non-linear analysis, what difference is there between applying a load as a step or a ramp with 'kbc' ?

Does it affect results?

 

[meshparts]

If you are doing just one substep per time step, then it makes no deference.

If more substeps are to be done during one time step, then it ramped loads should lead to a better convergence.

But I don't think a raped load would lead to deferent results in the case of statical analysis. Provided the analysis converges.

But in the end, just try it a see what it happens!

Regards
Alex

 

[maxibonne]

Hi Alex

Thanks. Yes in fact I had convergence problems when my loads were stepped: I have a very large amount of loadsteps including a large amount of substeps.

Ramped loads give better convergence.

Max