New Material

[Gholamreza]

Hello Engineers,
I am trying to develop a new material similar to Bouc-Wen Material but when I run for a SDOF in opensees I keep get this error

WARNING: NewMat::setTrialStrain() -- did not find the root z_{i+1}, after 20 iterations

and then

after: 100 iterations current Norm: 6.37412e-09 (max: 1e-09, Norm deltaR: 14.9972)

I could increase 20 iterations to a big number but it does not help much or I could play with time-step but still not a helpful way!!

Also what are the current Norm and Norm deltaR and why sometimes I get big values for them ?

[mhscott]

That is an error coming from your material where the root is not found. The numerical error will propagate back up to the structural level and you get non-convergence. You need to figure out whey your NewMat::setTrialStrain() gives the warning message.