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How to export 3D spheres (3D plot) generated in Matlab to ANSYS or Abaqus. ?

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Sadeep Thilakarathna
Sadeep Thilakarathna on 5 Jul 2018
Commented: Biltu Mahato on 17 Oct 2018
I want to export 3D spheres generated in Matlab to ANSYS or Abaqus. 3D spheres are randomly generated and I want to mesh the 3D spheres and analyse those. Can anyone help me to export the 3D sphere plot to any meshing software like Gmsh or Ansys or Abaqus?
  2 Comments
Sadeep Thilakarathna
Sadeep Thilakarathna on 6 Jul 2018
Hi..These spheres are randomly generated such that they do not overlap.ellipsoid function in Matlab is used.

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Answers (1)

Anton Semechko
Anton Semechko on 6 Jul 2018
Edited: Anton Semechko on 6 Jul 2018
The builtin 'ellipsoid' and 'sphere' functions produce bad quality meshes (in terms of element shapes and connectivity of the vertices). You can get much better quality meshes using functions from here.
Here are is an example:
% Unit sphere based on subdivision of an icosahedron; triangular mesh
TRa=SubdivideSphericalMesh(IcosahedronMesh,4);
% Unit sphere based on subdivision of a cube; quadrilateral mesh
TRb=SubdivideSphericalMesh(QuadCubeMesh,4);
% Visualize
figure('color','w')
subplot(1,3,1)
h=trimesh(TRa);
set(h,'EdgeColor','k','FaceColor',[0.9 0.9 0.9],'EdgeAlpha',0.5);
axis equal off vis3d
view([30 30])
zoom(1.5)
avp=GetAxesViewProps(gca);
ha=subplot(1,3,2);
h=patch(TRb);
set(h,'EdgeColor','k','FaceColor',[0.9 0.9 0.9],'EdgeAlpha',0.5);
axis equal off vis3d
MatchAxesView(avp,ha)
% Plot sphere generated with built-in 'sphere' function for comparison
ha=subplot(1,3,3);
[X,Y,Z]=sphere(20);
h=surf(X,Y,Z);
set(h,'EdgeColor','k','FaceColor',[0.9 0.9 0.9],'EdgeAlpha',0.5);
axis equal off vis3d
MatchAxesView(avp,ha)
Functions 'GetAxesViewProps' and 'MatchAxesView' used in this example can be downloaded from here.
1) When exporting the meshes, do you want the program to recognize the individual spheres or would it be OK if the their face-vertex connectivity lists were merged (so you would have a single mesh containing multiple disconnected spheres)?
2) What type of meshes will you be generating after exporting the spheres; hexahedral or tetrahedral?
  8 Comments
Biltu Mahato
Biltu Mahato on 17 Oct 2018
How did you assign material properties to .stl file? Abaqus doesn't let me assign material properties in Abaqus for .stl file imported from Matlab.

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