GetDampTangent method question

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rouyuan
Posts: 2
Joined: Mon Jun 04, 2018 3:21 am
Location: University of Bristol

GetDampTangent method question

Post by rouyuan »

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 material source code, it seems to return the absolute value and why? Thanks a lot！
Regards
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