Quasi-static Indentations FSI with RADIOSS

xrek

Hello,

I am trying to perform a quasi-static simulation using radioss. The initial model entailing solely hyper-elastic materials is working fine. Now I replaced a material type 42 with material type 37 that is a bi-phase material. My problem is that when enabling a mass scaling through /DT/NODA/CST in order to reduce the kinetic energy of the model and perform a quasistatic analysis, the model doesn't follow the requested time step. And then the solver stops due to negative volumes. Is there a way perform a quasistatic FSI with radioss? If so which are the appropriate values for MAT37? Is it better to choose a different material? or it isn't possible to perform such an analysis and thus move it to acusolve.

 

Here is my .hm file

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Simon Križnik

Hi,

 

the mass scaling technique will not reduce the kinetic energy- to the contrary, it will increase by adding mass. The timestep imposed is too high, increasing the mass of the model by 380% (normally only 1-2% mass increase is feasible)- probably the run fails due to this. Check INITIAL ADDED MASS ESTIMATION  in the starter out file: at scale factor 0.9 for a 1% increase in mass the imposed timestep should be 1.174E-06 instead of 1E-4. 

 

Although I haven't found this in the Radioss manual, it looks like MAT 37 is not supported for mass scaling (mass scaling in your model applies to other components and interfaces).

 

Fluid-Structure Interaction Analysis with Radioss and AcuSolve is possible (check the attached document from Radioss manual).

 

There are initial penetrations in your model and should be cleared before running. 

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