Question #691584 on Yade changed: https://answers.launchpad.net/yade/+question/691584
Jan Stránský posted a new comment: Hello, > why does the code first simulate a constant isotropic compression of > O.cell.velGrad=Matrix3(-.1,0,0, 0,-.1,0, 0,0,-.1)? > Is isotropic compression necessary prior to the simple shear of > O.cell.velGrad=Matrix3(0,0,.1, 0,0,0, 0,0,0)? Because the author decided it :-) Probably because it corresponds to simulated real situation. Definitely it is not necessary. > Does this step ultimately cause the periodic boundary condition to be flush with the particle regularHexa pack? Because without it, the periodic boundary condition seems to simulate a regularHexa pack within the representative volume element but it is suspended inside of it at iteration 0. Sorry, here I am lost... Could you please reword the question and idea behind? > exz ... Would this definition be analogous to the cell strain or deformation at a given time step? In this very specific case yes, exz=O.cell.trsf[0,2] is shear strain (in small strain sense) BUT, in general, be careful with mapping O.cell.trsf to strain (!) > I am fairly lost on what the data column 'i' could represent do you mean i=O.iter? If yes, then "i" is iteration number > Finally, I am curious about tanPhi. > Why is a change in angle being outputted when the rotational DOFs are being > blocked? Does tanPhi represent something else here? Even you have rotational DOFs of particle blocked, the cell as a whole deforms (after all you apply some shear). Anyway, here, tanPhi=(stress[0,2]/stress[2,2]) = shear stress / normal stress so it is not a geometric angle, but some stress measure. To me it seems like reformulated cohesion-less (c=0) Mohr-Coulomb condition shear stress = normal stress * tan(phi) tan(phi) = shear stress / normal stress so you basically output tangent of friction angle. cheers Jan [8] https://en.wikipedia.org/wiki/Lode_coordinates -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
