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Dear all, I am building a new material which will need to use getDampTangent method in the source code. I used (∂ stress)/ (∂ strainrate) to derive this value. My question is in getDampTangent method, whether should the exact value be returned or the absolute one? Since I checked the viscous materia...

Hi Gholamreza, I cam across a similar question. Did you make it successfully? Thanks a lot!