On 18 May 2010 16:55, Bruno Chareyre <[email protected]> wrote:
> > 2) Why do we need to continue if fn==0? >>> >>> >> IIRC Bruno told me that was to avoid contacts that transmit no force, >> even if they have non-zero nominal stiffness. Exact zero will be there >> for interactions that really had no force at all. >> >> I am not completely persuaded on that, since most likely contacts with >> exactly zero force will be already erased. Perhaps now it has only >> historical interest now? >> >> >> > Interactions without contact (un<0 && fn==0) are not always erased. Think > capillary law : you can have a capillary force (an interaction) between > distant spheres, in this case the normal force is 0 (the capillary force is > not added to fn), and there is really no stiffness to consider in GSTS, even > if this interaction has kn!=0 and is real. > In fact, this will be a problem for me. Capillary law is one specific case and has been computed, if I get it right, as a separate constitutive relationship. However, there are laws where fn can be zero and a stiffness has to be consider since the contact still remains as the contact area is finite. Could we find a way to make this line specific to capillary law then? I do not need it "exactly" now but soon. Chiara > > Bruno > > > > _______________________________________________ > Mailing list: > https://launchpad.net/~yade-dev<https://launchpad.net/%7Eyade-dev> > Post to : [email protected] > Unsubscribe : > https://launchpad.net/~yade-dev<https://launchpad.net/%7Eyade-dev> > More help : https://help.launchpad.net/ListHelp >
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