Hello all,

I have created a 3-d dynamic model in ABAQUS using shell elements.  When I run the analysis I get several warning messages indicating that I have zero pivot nodes.  When I locate where these nodes are, I find that they are in the middle of my beam (modeled with shell elements) away from any boundary conditions.  Does anyone know why ABAQUS is indicating these inconsistent overconstraints in the middle of my model???  The analysis fails to converge when NLGEOM=yes but has no problems converging when NLGEOM is removed.

Thanks in advance

I am trying, quite unsuccessfully, to model a composite steel frame under dynamic loads.  The problem is nonconvergence brought upon by the concrete tensile strains (i think).  Apparently ABAQUS kills the analysis once cracks form in the concrete.  Has anyone had any success using the "Concrete damaged plasticity model" under cyclic loads and large strains.  I have found that researchers use many different concrete properties to get convergence, but I am more interested in a better concrete representation.

Any help on this would be greatly appreciated.

Hello, a simple question about the Lagrangian and Eulerian descriptions of fluid flow.

When is the Lagrangian (particle point of view) useful? It seems
that the Eulerian is always the right one, since velocity and pressure
are fields.....

thanks !

influx

Hi everyone!

I'm brand new of this website, but I'm already very excited about it - it's really helpful.

hi, i am currently working on using abaqus software for solving sintering problems . i just want to know how i can introduce new parameters into abaqus so that by giving some eqns for those i can solve the values of final porosity, shrinkage etc that are not pre-determined in the abaqus . i want to know the porosity distribution  and shrinkage rate in a particular given problem as outputs . please help me out . thnq