ERROR : in add_sm_st: coefficient should be 0

Hello,

I have come across a strange error, which is following.

I researched a bit and the troubleshooting is to remove any overconstraint or underconstraint. Strangly in my model it all works perfectly till I define my contacts. So without contacts, I do not get this error.

In few models I also observed that using 1st order elements for contact part resolves this error, but in the model uploaded here, it does not work.

I have uploaded the file in different parts please download them and place them together then extract them.

can anyone please help me.

Thank you in advance

I’m trying to download this but why is the file so large if there are no results in it ? Is the mesh very dense ? How many nodes/elements does it have ? It would be good to reduce the size of the model for debugging.

There are 576,760 2nd order elements in my assembly. The file is too big because I had imported multiple geometries and did lot of trial and error in the same file. I had just renamed the file multiple times to save time on remodelling. also the option save result in pmx file is turned as yes.

I will make another file and remodell it. Once it is done, I will upload it.

I’ve managed to download it. For the future, to significantly reduce the size of the file being shared, you can use the File → Close All Results option and then save.

There are some overconstraints in the top part of the dome (around the hole). Rigid body overlaps with tie constraint on one edge there. You can e.g. exclude that edge from rigid body constraint definition to avoid overconstraint. Then you also have a boundary condition applied to the whole plate which also has tie constraint on its top surface. Apply this BC to the bottom surface.

Thank you so much. I misunderstood the overconstraint and thought that tie constraint and boundry conditions can overlap. Now I have corrected it. It works.