New Material

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Gholamreza
Posts: 84
Joined: Tue Nov 07, 2017 7:47 am
Location: University of Central Florida

New Material

Post by Gholamreza » Wed Dec 30, 2020 7:57 am

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
Posts: 872
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
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Re: New Material

Post by mhscott » Wed Dec 30, 2020 12:40 pm

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.

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