Hello Vaclav, From Eq(3.39) and the chart on page 52 in your thesis, How to deal with the kind of materials which have the poisson's ratio of over 0.25 (0.25-0.5). For this kind of materials. In the other words, how to get the Kt from Kn and poisson's ratio? Thank you so much.
Best Liqing At 2010-09-20 23:14:39，"Vaclav Smilauer" <[email protected]> wrote: >> Thank you for your comments. I can understand it. You know, from the >> mechanical concept, the shear modulus (G) can be represented by E/2*(1 >> +v) for homogeneous isotropic materials, here E is young modulus, v is >> poisson ratio. So, can we decide G_over_E is equal to 1/2*(1+v) >> directly? Can we use 1/2*(1+v) to calculate kt/kn? >> Thank you so much. > >No, I don't think that would work; the notation in the code (G_over_E) >is a little misleading again, G=kt/A and E=kn/A on the interaction level >are different from Young and shear modulus for continuum (in the sense >of how a RVE of particles would behave globally), depending on packing >configuration etc. > >Eq (3.39), pg 51 of my thesis gives some a relationship between kt/kn >and Poisson's ratio based on the microplane theory analogy (see the >article referenced for details), but there is a number of suppositions, >such as fixed particle radius (otherwise the dimensional analysis would >have to take in account more parameters). (pg 52 shows that it matches >in a sense) > >HTH, Vaclav > > >_______________________________________________ >Mailing list: https://launchpad.net/~yade-users >Post to : [email protected] >Unsubscribe : https://launchpad.net/~yade-users >More help : https://help.launchpad.net/ListHelp
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