>> You're right! Some people consider granular matter as a continuous media. I >> don't. >> > The integral is for one grain alone. Considering one grain as a > continuum doesn't sound so absurd, does it? > We are far above the atomic scale.
As I said, I see no problem for the computation. I just made a comment about the term "exact mean stress" which can be misleading. >> The particles are rigid, i.e. 6 independent DOFs and that's all (Elasticity >> is introduced in force-laws). >> We can always define whatever we want. The question is what is the sense of >> our definition. >> As I said, the definition of a particle stress is ok, but the volume used in >> this definition is a matter of convenience. > I don't really trust the "rigid particle" story. A contact point being a > point, it can't be deformed, then it must be the particle that is > deformable. Real silicate grains are deformable too. Personally, I have never heard about non-strainable material, even diamond! >> Yade users must form their own opinions > Thats true. >> and given them a function that compute a particle stress is in my opinion a >> bit dangerous. > It is not dangerous as long as people consider a number for what it is. > The documentation says "exact mean stress from contour integral of > external load". The demonstration starts with "at equilibrium", and the > whole thing is classical elasticity. Fair enough. >> Why don't you provide a function to compute the moment tensor and then the >> user is free to use the volume he want in order to compute the stress? > Simply because I never heard about moment tensor. Not saying it would > not be interesting to add a function for that. >> The real aim of this proposition is to empower the user, who sometime use a >> function as a black box. > Mmh... Who is to blame in that case? Nobody. > And, come on, those ones would > remember they have to divide the return value by a volume?! People are not so careless!! In any case they should not be. Vincent _______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
