FEM Example 3.4

Example 3.4

L(x,z) = Lift pressure

D(x) = Drag pressure

P = Point Load

Example 3.4

CAD drawing

• First, create a CAD drawing that fits problem description. We use Unigraphics NX-5

• Create Sketch

CAD drawing

• Use same axis coordinates as original problem for less confusion.

• Make complete sketch and use proper constraints( tangent, parallel, same length, fixed, etc)

• A more advance way is to make one section and mirror the sketch using a reference line (this happens because of the blade’s symmetry.

• Create an extrude with total length of 200 in.• Export .prt to HyperMesh(.hm) saving file as .igs

CAD drawing

HyperMesh

HyperMesh

.igs files provide complete surfaces of imported element but only as a shell element.

HyperMeshHow to mesh our part(s)

• Hit F2 key to delete entities.

• Esc to return to main menu.

• First, create nodes and lines to separate feature in different meshing surfaces.(on Geom in main Menu)

HyperMeshHow to mesh our part(s)

HyperMeshHow to mesh our part(s)

•If problems with node tolerance appears, go to options, pressing o on keyboard, or go to Preferences-options.

•Reduce Node tol

HyperMeshHow to mesh our part(s)

•Trim with lines on the right column•Click on surfs in second column•Pick front surface.•Click lines in second column•Pick the two horizontal lines to separate that surface with the rest of the part.

Remember that meshing has to be continuous but done on four different surfaces

HyperMeshHow to mesh our part(s)

•Click 2D•Click automesh•Pick surface you want to mesh

HyperMeshHow to mesh our part(s)

Remember, this is only a surface mesh of our part. Now we have to Drag the mesh to create a volume.

HyperMeshHow to mesh our part(s)

•Click 2D•Click drag