Step time dependent material

[Ashok]

Hi,
I am writing a new material - it's response depends on the step time. How can we give material class - an access to step time and time increment ?
Currently the only way I can think of is - using "strainRate" in "setTrailStrain()" method i.e. (deltastrain)/strainRate = time increment .
Any alternatives please...?


Thank you,
Ashok.

[mhscott]

You can get the time step from ops_Dt, a global variable. Search the source code for it. You can see an example in BilinearOilDamper.cpp.

[Ashok]

Thanks a lot. It worked.

[Ashok]

Dear Prof. Scott,
One more question. After formulating the material and running the test analysis(https://opensees.berkeley.edu/OpenSees/ ... U8yPeZbHdU) - I am getting a plot like shown in the figure. Everything is fine - except one point goes somewhere astray... Can you guess the reason behind this ??


Thank you,
Ashok

[Ashok]

Sorry, here is the image
https://drive.google.com/file/d/1tvaq2V ... sp=sharing

[mhscott]

It could be an error in the material state determination, or in how you set up the testing script. I can't really tell.