Hello ccx users.
I am trying to set an analysis formed by two step:
First step : resolution interference between bearing and housing
Secondo ste: application a load at the center of the bearing througha a rbe3 (distributing coupling).
The results in terms of the dispacement if the first step are the same, but in the second step they are very different.
If the bearing has settle properly in the housing as it seem, both parts should move togheter in the plane of the seating surface with continuity in the displacements colour field.
¿Does the gasket have some BC or is it completely free?
¿Could you increase by lets say x10 the deformation scale to see where is each part going and why are colours discontinous between bearing and housing.?
¿Do the stresses match Abaqus?
Oh, I see. So it’s HyperMesh used for postprocessing. Was it the same input file as in CalculiX (just with small syntax adjustments) or recreated from scratch for Abaqus ?
https://we.tl/t-0eIuwTaEiz
Hello, I copied the model ccx and abaqus. I create a smaller model. As I told you, in the secondo step the result are different in terms of displacements.
Why are you using C3D4 elements for the housing ? Linear tetrahedrons should be avoided in the majority of cases. Small sliding contact is risky too but I guess that you chose it to use *CLEARANCE in Abaqus.
I know that c3d4 generates stress different than C3D10, but in terms of displacements the results should be the same. However I used C3D4 becuase really we have a big model and in local Pardiso got crashed. I gave you just an extrapolation of a big model.
Yes I used small sliding becuase in abaqus it is mandatory to use clearance.
However as you can see in the first step, the correlation of the displacement are very good. There is something that doesn not work in the second step.
The results of the abaqus are fine by physical point of view.
To me it looks pretty much the same. The maximum disp’s are due to peak loads, and we know for concentrated loads CCX elements aren’t as good as abaqus, just a bit far away looks the same. Check the values
A *DISTRIBUTING coupling is usually selected in order to distribute a
force or moment area-weighted among the nodes of a surface. For this to work
properly the surface should be plane.
maybe you should try a different loading method. In prepomax you can apply a total force on a surface directly.
I use both C3D4 for ccx and abaqus. It is just a preliminary analysis to set the simulation and find a correlation. Afterwars I will switch the element into c3d10
Exactly. That’s what I am saying. Ccx is different software despite syntax is very similar. So don’t expect same modelisations will work the same in both softwares.
