Question #271097 on Yade changed:
https://answers.launchpad.net/yade/+question/271097
Status: Open => Answered
Bruno Chareyre proposed the following answer:
Yes you are right. We use rather different semantic and that's why the doc is
confusing for you probably.
I never speak of cohesive force vs. non-cohesive force. For me there is just a
contact force.
A cohesive contact remains cohesive be it in traction or compression.
"Cohesive" just means F_n=min(k_n*u_n, a_n) with a_n not zero. This definition
holds whatever the sign of u_n.
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