Yade

How to measure local strain rate within YADE particle assembly

Asked by Mahdi

Dear YADE community,

I want to measure the local strain rate [Velocity Tensor] within YADE particles (for a selected zone within a UCS specimen).
Specifically, I am looking for an infinitesimal strain tensor, rotation tensor as well as velocity gradient tensor.
It would be great if anyone has any ideas.

Many thanks,
Mahdi

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Jan Stránský (honzik) said : 		#1

Hello,

in general, you measure strain together with time.
Knowing both strain and time, strain rate should be easy.
So you know how to measure local strain?

Cheers
Jan

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Mahdi (mahdi2023) said : 		#2

Hi Jan,

I appreciate your prompt response.

I am aware that the "UniaxialStrainer" feature can be activated, allowing us to measure axial strain using the equation Axial_Strain = -strainer.strain. However, it gives the global strain values (Macroscopic response). Unfortunately, my search in the YADE manual has not yielded any functions or methods directly related to obtaining local strain information within the particle assembly.

I would greatly appreciate it if you could share any insights or recommend any functions or methods that can help us obtain the local strain data.

Thank you for your assistance.
Mahdi

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Jan Stránský (honzik) said : 		#3

See e.g. [1]
Cheers
Jan

[1] https://yade-dem.org/doc/user.html#micro-stress-and-micro-strain

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Robert Caulk (rcaulk) said : 		#4

Hello, please start directing your questions to:

https://gitlab.com/yade-dev/answers/-/issues

We will be closing launchpad shortly.

Thank you for your cooperation,

Robert

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Mahdi (mahdi2023) said : 		#5

Thanks Jan, I am working on it. This issue is now solved.,
@Robert, sure I have moved to github for any new questions.
'
Thank you a lot.