paul18 wrote: ↑Wed Aug 30, 2017 8:55 am
@thschrader :
I think the boundary conditions you've implemented lead to a
stress overestimation;
the maximum stresses are probably localizzed on the elements immediatly near the clamped ones!
If I were you, I would have :
- implemented contact conditions between the wheel and the ground
- as well as between the spokes and the outside diameter
- had a look if it's possible to model only a part of the wheel
If possible :
- the mesh must be refined (with brick elements) near the maximum stress localization, and coarser elsewhere (but not mandatory of course)
- the use of rigid elements to apply the loading on a basic node, on the centre of the wheel, will help
What type of material features have been used:
- isotropic material? Young modulus, Poisson ratio and density?
- they correspond to what type of infill?
The conclusion may not be different from yours (the part does not whistand the loading), but the values/accuracy of the finite element analysis strongly depend on how it has been modelled!
Paul
Paul, thanks for the advice. You are right, this can be done better. It was only a first approach.
I have no good experience with contact-problems (christoph/UR_ ,you are welcome
)
The use of brick elements is not supported by gmsh/netgen in freecad (have I missed something?)
Material is default-pla from FEM-WB, see file (file with cleared mesh)
regards Thomas
Job done with:
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.11935 (Git)
Build type: Release
Branch: master
Hash: a5bc70cca0d2eaa56709603521650ccb3d8d926c
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.1.0
Locale: German/Germany (de_DE)