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[nobody <question689676@xxxxxxxxxxxxxxxxxxxxx>]

Question #689676 on Yade changed:
https://answers.launchpad.net/yade/+question/689676

    Status: Answered => Solved

nobody confirmed that the question is solved:
Hi Jerome,

So you mean that the principal directions are in the global system?

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Hi Jan, 

The local system I'm referring is the system on every particle itself.


>>>both "the equation above" and "adding the stress in each direction" has nothing to do with principal directions..

Here I'm thinking that the principal stresses have different principal directions, so if we want to get the overall stresses for RVE, we need to decompose the principal stresses into the global system. So I think we need the principal directions.
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Hi Bruno,
Yeah, I refer to the system on the particle itself is the local system. 
As I mentioned before, in order to get the overall stresses for a specified volume, I need to decompose every principal stress into the global x, y, z, axis and then added all the components in each direction so that I can get the overall stresses with three components in the three global directions. this is the reason I want to know whether the principal directions are in the global system or not.

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overall, with the information, you guys mentioned before. Now, I know that the principal directions are in the global system.

thanks,
Yong

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