to avoid singularity in shell to solid
to avoid singularity in shell to solid
(OP)
The issue about handling shell to solid connection came up in this forum a quite few times and understand that this is because of stiffness matrix being singular.
Could someone explain what exactly causes matrixt to be singular and how the use of MPC prevent this from happening?
Could someone explain what exactly causes matrixt to be singular and how the use of MPC prevent this from happening?





RE: to avoid singularity in shell to solid
http://www.mscsoftware.com/support/online_ex/Patran/Pat...
There are now special coupling elements which do this automatically, and I believe some of the latest FEMAP and/or Nastran programs have this capability. I've always got away with using the extra shell element method, but it's not as accurate as using MPC's in critical cases.
RE: to avoid singularity in shell to solid
You don't want to embed the shell in the solid because you are artificially stiffening the structure. Likewise, you have to be very careful if you are going to try and write multipoint constraints or equations to do this. You need a distributed flexible coupling which transfers the momements.