On 10 May 2010 18:03, chiara modenese <[email protected]> wrote: > > > On 10 May 2010 17:43, Bruno Chareyre <[email protected]> wrote: > >> >> >>> Hi Bruno, please see attached file. I am not completely sure but I think >>> it would be correct to distinguish between loading and unloading phase. I am >>> trying to prove it analytically, I am not yet totally confident.. What do >>> you think? >>> >>> There is no trialFs in your figures, this is the key factor. >> >> us + (current-prev)/ks could make sense in some formulations if *=ratio >> was applied _before,_ but it is applied _after, _so that "current" is in >> fact the "trial" value (as you pointed out). >> >> OTOH, us is exactly (trialFs-prevFs)/ks, by definition of trialFs, >> (trialFs-currentFs)/ks is exactly the plastic part , >> and (currentFs-prevFs)/ks is the elastic part. >> >> I don't see any difference between loading and unloading. > > > I agree that the plastic displacement is (trialFs-currentFs)/ks. However > your formulation is not incremental because you are using the trial value. > To me this would be the right procedure only in the case in which shearForce > is maintained constant. But shearForce is actually varying (right? Where do > you account for this variation in your formula?) and as I sketched in my > picture there is an elastic contribution that turns into plastic > dissipation. Can you see my point? I will find out the analytical > explanation. > > When I say shearForce is varying I mean the maximum friction value. Maybe I am a little confused now, perhaps I am wrong. Could you just tell me if you see any effect due to the variation of the maximum friction? Because that is why I was making distinction between loading and unloading and for the same reason I am not convinced that using Trial force would be the best choice. thanks, chiara
> Chiara > >> >> >> Bruno >> >> _______________________________________________ >> Mailing list: >> https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> >> Post to : [email protected] >> Unsubscribe : >> https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> >> More help : https://help.launchpad.net/ListHelp >> > >
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