Bilbik
Mechanical
- Jan 17, 2012
- 1
thread825-202613
I used the above thread as initial information because I am doing a non linear material FEM.
Currently we are investigating the ability to model organics and thus are using Ogden and Mooney-Rivlin Materials.
My problem is exactly the same as the one referenced above. I can apply a Fixed Constraint to one face of a 2x2x2 inch cube. The cube is meshed using Tet(10) elements and therefore is a 3D solid body. I apply a pressure to the opposite face and get the error as follows.
"NASTRAN Msg: ***WARNING: No element connection for node 1 directions 4, 5, 6
***WARNING: Similar warning suppressed for 313 other nodes.
NASTRAN Msg: ***WARNING: Nodal degrees of freedom without element
connection have been fixed for data input file.
This is a very confusing error message to me. When I mesh the box as a solid body, how are the elements not connected in some way ? The simulation will work if I apply two Enforced Displacement Constraints(the only displacements are in the X and -X directions with all others zero'ed) to the opposite faces but gives me an error when i attempt to Fix on face and load the other.
Any help is appreciated !
I used the above thread as initial information because I am doing a non linear material FEM.
Currently we are investigating the ability to model organics and thus are using Ogden and Mooney-Rivlin Materials.
My problem is exactly the same as the one referenced above. I can apply a Fixed Constraint to one face of a 2x2x2 inch cube. The cube is meshed using Tet(10) elements and therefore is a 3D solid body. I apply a pressure to the opposite face and get the error as follows.
"NASTRAN Msg: ***WARNING: No element connection for node 1 directions 4, 5, 6
***WARNING: Similar warning suppressed for 313 other nodes.
NASTRAN Msg: ***WARNING: Nodal degrees of freedom without element
connection have been fixed for data input file.
This is a very confusing error message to me. When I mesh the box as a solid body, how are the elements not connected in some way ? The simulation will work if I apply two Enforced Displacement Constraints(the only displacements are in the X and -X directions with all others zero'ed) to the opposite faces but gives me an error when i attempt to Fix on face and load the other.
Any help is appreciated !
