How KT is calculated in CundallStrack Contact Model

Asked by Trishala DAKA on 2021-02-19

HI,
I am new to Yade.
I am using CundallStrack contact Law. In the documentation it is mentioned that Kt is the ratio of Kn and the ratio is calibrated to match the macroscopic poisson's ratio. Is there any specific formula to calculate the Kt value.

Thanks.
Daka

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Jan Stránský (honzik) said :
#1

Hello,

> I am new to Yade.

welcome :-)

> Is there any specific formula to calculate the Kt value.

No :-(
As the documentation says, set the value such that the macroscopic response of your sample match the desired value.
A few tests for different values should tell you the basic trend. You can try some extreme values, e.g. 0 and 100, then a few "normal" values, like 0.1, 0.2, 0.5.
The actual trend (and "a specific formula to calculate the Kt value") would be different for different geometry - particle size distribution, packing density (dense/loose), actual packing (structured/random/layered/...), .........

cheers
Jan

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Trishala DAKA (saidaka) said :
#2

Thank you Jan

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