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[Question #266331]: How to intepret strain tensor and its deviator

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From: Shenyang Cai <question266331@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 03 May 2015 07:21:33 -0000
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New question #266331 on Yade:
https://answers.launchpad.net/yade/+question/266331

Hi all,

I have some difficulties understanding the strain tensor and its deviator given by the TesselationWrapper(). Now I've got three questions.

Firstly, strain tensors ought to be symmetric matrices. Why strain tensors given by TW are asymmetric?

Secondly, why is the strain deviator a scalar rather than a matrix? What does it mean?

Thirdly, there is an option called "magnitude" for processing strain tensors in Paraview. By saying magnitude does it mean the determinant of strain tensor? 

Thanks!

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