I have a problem when meshing my model.
I get this text when the error is find:
fem2esh - Make esh file from fem file for a specified design scenario
Version 2014.00.00.0513-W64/X64 22-Feb-2013
Copyright (c) 2013, Autodesk, Inc. All rights reserved.
Version of fem2esh.exe : 2014.00000513
Version of dcx1-win-x64.dll : 2014.00000513
Version of femapi-win-x64.dll : 2014.00000513
Version of agsdb_ar-win-x64.dll : 2014.00000513
Version of tsx2tsy.exe : 2014.00000513
Input Model : C:\Autodesk\2014-13-26\Ram_simulering.ds_data\1\ds
Input File : C:\Autodesk\2014-13-26\Ram_simulering.fem
Output File : C:\Autodesk\2014-13-26\Ram_simulering.ds_data\1\ds.mod\group.esh
Log File : C:\Autodesk\2014-13-26\Ram_simulering.ds_data\1\ds.mod\group.ldx
Design scenario : 1
Analysis type : Linear Stress
Start time : 2014/03/28-11:17:39
--- Get 34 active element parts in range [1, 34] from fem file
--- 1 enabled L&C groups are defined
--- Get 233086 points defined in range [1, 270785] from fem file
Calling the Surface Topology Generator (tsx2tsy)...
tsx2tsy: Update part surface contact/bonding data (duration=1 sec.)
Making interior points for midside nodes...
--- Made 75209 interior points for midside nodes
Set up nodal properties such as admissible BC etc. by adjacent elements...
In working on FEM file for a FEA model
Terminal Error: FEM2ESH#63
NO_3D_ELEMENT: please check meshing phase 11
2014/03/28-11:17:41
Its a problem with part 11 (se picture below), there is a (i) marked on the part. What does this mean? And I get a error when meshing this part.
And as you can se, the joint lookes wird at the nearest wheel. I dont know if its a bug or something but when i created the joint, I selected the area in the holes where the joint should run through. It should look like the other wheel but it dosent.. Is it just a bug or something wrong?
Hi Medinh,
The Terminal error refers to a part not have a solid mesh. Looking at the screen shot, it does appear to be part 11. The little 'i' icon for the part; it means that Sim Mech sees disconnected surface edges, i.e. not a solid part. This usually means a CAD problem with the part. What CAD package was the model created in? Is part 11 supposed to be a solid body or is it a surface body?
Thanks,
James
Thanks for quick answer!
I use Autodesk Inventor. There is no problem with the cad file in inventor. I can run some simultaions there without warninngs.
The part should be solid like the other ones, i dont understand why it shouldn't. I use solid parts in mesh settings. It has the same settings as other parts.
Somehow it managed to create a tetrahedron mesh after a few times trying. BUT there is another problem now!
When i run the analasys, nothing happens! Everything is zero! The displacement, von mises stress, evertything. I have a gravity load with 20G! and I put the general constrains (fixed) at the four wheels.
When I run the simulations i get these warnings:
Warning: zero stiffness replaced by 1.0E+20 in EQN#51106 at NODE#17038 DOF Tx
Warning: zero stiffness replaced by 1.0E+20 in EQN#51107 at NODE#17038 DOF Ty
Warning: zero stiffness replaced by 1.0E+20 in EQN#51108 at NODE#17038 DOF Tz
Warning: zero stiffness replaced by 1.0E+20 in EQN#51109 at NODE#17039 DOF Tx
Warning: zero stiffness replaced by 1.0E+20 in EQN#51110 at NODE#17039 DOF Ty
And this is how it looks like:
Thank you for the tip! But the computer have 4gb RAM, and the system requires only 2gb, so it shouldnt be a problem..
Hi Medinh,
The zero stiffness warnings are likely caused by elements being removed due to being highly distorted. Still sounds like a meshing issue. I want you to remesh the model with the following mesh setting tweak. Go to 3D mesh settings -> Options -> Model and deselect Use Automatic Geometry based mesh size function. Now remesh the model. That will give you a more uniform mesh, which is handy when solid meshing thin parts.
Thanks,
James
Hi Medinh,
Can you upload the model to look at?
Thanks,
James