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[Jan Stránský <question685523@xxxxxxxxxxxxxxxxxxxxx>]

Question #685523 on Yade changed:
https://answers.launchpad.net/yade/+question/685523

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

see [1] for more details.

1) and 3) yes

2) relKnSoft is a factor to reduce the **tangent** (not elastic, since plasticity is involved) modulus of the bond in compression.
Elastic modulus remains unchanged (visible for unloading).

4)
> the stress-strain relationship is linear elastic at the beginning

yes

> then what will happend to the curve? is there a strain limit after
which the bond will be damaged?

no, in compression the strain is not limited. The **elastic** strain is
limited, followed by plasticity (perfect, with hardening or with
softening). But no damage.

cheers
Jan

[1]
https://www.researchgate.net/publication/45194493_Cohesive_Particle_Model_using_the_Discrete_Element_Method_on_the_Yade_Platform,
section 3

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