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[Luc Scholtès <question700691@xxxxxxxxxxxxxxxxxxxxx>]

Question #700691 on Yade changed:
https://answers.launchpad.net/yade/+question/700691

    Status: Open => Answered

Luc Scholtès proposed the following answer:
Hello,

I copy here a citation from reference [1] where the calibration
procedure of the JCFPM model is explained:

"... the calibration procedure was run as follow:
1. Choice of a coordination number N allowing matching the desired tensile strength to compressive strength ratio sigmac/sigmat. As a first approximation, from the authors’ experience the c/t ratio is taken equal to the macroscopic sigmac/sigmat ratio. Looking
first arbitrary, this option seems however to capture the micromechanisms usually observed experimentally as tensile cracking is representative of the brittleness of the material.
2. Determination of the elastic parameters Eeq and kn/ks in order to match the elastic properties (Young modulus and Poisson ratio) by running either tensile or compression tests.
3. Determination of the local tensile strength t in order to match the tensile strength sigmatof the material by running tensile tests.
4. Determination of the interparticle friction angle in order to match the slope of the failure envelope by running a series of triaxial compression tests at different confining pressures."

Of course, the citation makes sense only if you have a look at the model
description in the same paper and at the discussion about the N value
(coordination number/number of bonds per particle which is a function of
the interaction radius defining near neighbour interactions).

For sets of values for a granite or a sandstone, you can have a look at
table 3 of the same article.

Do not hesitate if you have other questions.

Luc

[1]:
https://www.sciencedirect.com/science/article/abs/pii/S0022509612002268

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