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ArneDerluyn

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  1. Okey, I now have a working model. But the Modal analysis creates a self-intersecting geometry, which indicates that something is still wrong. I have assigned different PSOLID properties per ply, by transforming the stiffnesses according to the fibre direction. This is something which I generally try to avoid because it is a seed for errors. The model also shows some edge effects. This model is less strong than the physical test, the model indicates only 72% of force allowed versus the physical test. Buckling result (Mag x10) Eigenvalue_Bucke_Solid_Skin4.hm Eigenvalue_Bucke_Solid_Skin5.out Eigenvalue_Bucke_Solid_Skin5.fem
  2. PCOMPLS is not supported in Buckling analysis I will try something different using 3D elements *** ERROR # 4233 *** Layered solid shell composites (PCOMPLS) is not supported in buckling analysis. Eigenvalue_Bucke_Solid_Skin2.out (There are some other warnings and stuff, but I haven't debugged properly, because using this property will not work for the analysis.)
  3. I can do this, but up until now I have refrained from using 3D elements for the modelling of the composite skins because of the error introduced when modelling slender elements using solid elements. Like is mentioned in the Altair Book "Practical Aspects of Finite Element Simulation", and in University. Would this be a large error? I will try the 3d element method, and report back in a few hours
  4. Could you elaborate? I do not know what you mean by KU Boundary
  5. Dear, I am trying to preform a buckling analysis of a composite sandwich material. But the Auto-SPC limits the DOF's of the composite skins, so that buckling can not happen in correct way. When the Auto-SPC is dissabled, the solver gives the error which states that the DOF's of these elements should be limited, because they have no stiffness in that direction. This is true, due to the material and property assignment (Mat 8, and PCOMPP) which does not provide stiffness in the 3th direction. Is there a work around? I also did a dynamic test (Radioss) where the specimen does not buckle according to the first mode. Test to be replicated: Optistruct First mode Faulty result due to Auto SPC RADIOSS Result Model : Eigenvalue_Bucke_2.hm
  6. Dear, Is there a way to couple nodes using periodic boundary conditions? I am working on a project where we are trying to homogenize a honeycomb material using unit cells. The displacement of the nodes at the first boundary of the unit cell should be the same as at the opposing boundary. From a textbook:
  7. I found the mistake I had to re-mesh after controlling the edge connectivity
  8. Dear Forum, I am trying to simulate a 3 point bending test of a composite beam. This beam has inner ribs to create more stiffness. But when the analysis runs, there is no stress/strain on these inner ribs. See picture What can I do to correct this. I first draw CAD geometry, using surfaces. I split the surfaces on the contact edge, to assure a proper t-junction edge. (Yellow edges in the picture) Then I import Geom; mesh ect (the rest is history). Thanks in advance Arne PS any other pointer are also welcome Mesh_1_Lam_Load.hm
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