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[Question #668192]: how does yade calculate the boundary displacement when I give a strain

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From: "dan.wang" <question668192@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 23 Apr 2018 09:37:50 -0000
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New question #668192 on Yade:
https://answers.launchpad.net/yade/+question/668192

I applied strain to the boundary to calculate the stress.
I used O.cell.velGrad to reach the goal strain(periodic boundary is used). 
And my question is :
How does Yade calculate the  boundary displacement using the strain I applied (dt, loadstep are known)?

I read part your Dr. 's paper and the source code(Cell.cpp) and still don't know. Can you please tell the theory or where can I find the paper that detailly talks about it? 
Thanks!

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