On Sat, 4 Jun 2011 06:50:57 pm honzik wrote: > Question #159902 on Yade changed: > https://answers.launchpad.net/yade/+question/159902 > > Status: Open => Answered > > honzik proposed the following answer: > >3) How can I simulate a flexural test? like that > >http://www.substech.com/dokuwiki/lib/exe/fetch.php?w=&h=&cache=cache&media > >=3-point_flexure.png Once again, what is the best way to do it? Is there a > >function similar to the unixialstrainer to do it? 'Cause a solution is to > >do it with forceEngine applied directly on spheres, but it's not > >convenient at all. Another solution would be to create a rectangular > >geometry and to apply a stress on it. > > You can simulate it in the same way as experiments, i.e. prescribe vertical > displacement in the point where the force is applied and evaluate the > reaction. It is a standard way to obtain stress-strain (or > displacement-force) diagram in displacement-controlled tests. The supports > can be simulated in many ways, I would do something like (for simply > supported beam) fixing vertical and horizontal displacement of particles > in left lower corner and fixing vertical displacement of particles in > right lower corner. Another way is, as you wrote, to define rigid cubes > and model supports by them. > > >5) Which IPhysDispatcher Ip2 I'll need? Does it seem realistic for you > >Ip2_CpmMat_CpmMat_CpmPhys for the concrete and > >Ip2_WireMat_WireMat_WirePhys for the steel? > > I don't know if some dispatcher to handle CpmMat and WireMat interaction > would be needed..
Indeed, you would need a new dispatcher in order to use CpmMat together with WireMat. > >7) Finally, what about the geometry and degrees of freedom? Most of time > >there are only 3 degrees of freedom, am I right? why not 6? > > The Dem3DofGeom means that the bond between two particles has 3 degrees of > freedom components (normal and two shear components), i.e. there is no > bending or twisting. In Yade there are definitely some models using 6dofs. Just remember, my current implementation of the WireMat considers just one DoF (normal displacement->tensile normal force) for the steel. So it should work fine for the pull-out test. I'm not sure about the bending test. > What kind of steel behavior do yo want to simulate? only simple yielding > in normal direction and pullout of steel bar from concrete? for this > purpose even special definition of CpmMat could be sufficient :-D It might be a good point to start with. It's always easier to deal with one material and just adapting the material properties. Klaus -- Dr. Klaus Thoeni - Centre for Geotechnical and Materials Modelling Civil, Surveying and Environmental Engineering - Engineering Building EA The University of Newcastle, Callaghan, NSW 2308, Australia web: http://www.newcastle.edu.au/research-centre/cgmm phone: +61 (0)2 4921 5118 _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
