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Extremely high local stress maxima in static analyses
Posted 25.03.2014, 08:11 GMT-4 Mesh, Results & Visualization, Studies & Solvers, Structural Mechanics Version 4.3b 0 Replies
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Problem was solved by the comsol support. The meshes on the two sides didn't match each other, which caused these unplausible results.
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i'm experiencing a problem with a quite simple static analysis in comsol multiphysics.
In attachement 1 you can see the geometry of the model, which consists of two plates (aluminium) that are only connected in the circular areas.
In attachement 2+3 the mesh and the mesh statistics are shown, which are quite ok. A finer mesh is not possible, because of limitations in computational power. The mesh is a free tetrahedral mesh for the whole geometry.
loads and boundaries:
*Prescribed Displacement (x) of 0.005mm at the end of each plate (opposed directions)
*Prescribed displacement of 0mm in y and z direction at the end of each plate
*Symmetry (y-Directions)
*Continuity in each circular area
Solver:
MUMPS Solver with standard settings. Have tried PARDISO, which makes no difference to the result, but is a bit faster.
Results:
The deformation plot (Attachement 4) looks plausible. The stress plot (Attachement 5) shows circular stress distributions araound every contact area, which is also plausible, but it also shows very high, randomly distributed maxima around the contact areas which is not plausible for me.
Are there any ideas how to solve this problem? It seems to be a problem with the mesh, but it happened with different mesh sizes and parameters too.
Thanks for your help!
(The MPH File is in Attachement 6, if someone wants to take a closer look)
Attachments:
Hello Martin Zöltsch
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