Riks method-- question

[Chen1]

I have question about the load proportionality factor in the Riks method. I know that, it is used to tell Abaqus when to terminate the step.

Suppose i want to apply the full load which was applied in the load module, so the load proportionality factor should be 1??

I have another question about the minimum and maximum of the Arc length. what are the optimum input for them?

Thanks

 

[Chen1]

Any ideas?

 

[StefCon]

Hi,
First off, I'm far from an expert in Riks analysis.

If you apply the full load then the LPF should be 1 when the entire load is applied. If you apply the unit load of 1 (which I usually do) then the LPF would be equal to the load you are trying to apply.

Arc length is like (in layman's terms) your time increment. A high maximum may allow your run to be quicker but I've heard that the maximum should be limited for it to accurately find the maximum LPF. I do not have any experience of this myself, I used 3 as maximum when I applied unit load of 1.

Can anyone confirm?