To fix amount of a value unchanged

[Ehsan]

Dear all,

I want to define a condition for one of my degrees of freedom. The condition is that when the degree of freedom reaches a certain value after that it will remain unchanged. For example if the degree of freedom is S, after reaching S less than 0.01 I want to fix this value to zero in the next steps of solution. Is there any specific commnad to do it?

Thanks in advance,
Ehsan

[Prof. R.L. Taylor]

there is no command to do this.  you need to write a 'umacro'  that sets the value and I also recommend you remove this dof from the active equations, otherwise it probably will not converge.

[Ehsan]

Many thanks,

I will try it.