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CAD import

HyperMesh Introduction. CAD. Final Design. CAD import. Geometry cleanup / repair. Prepare geometry according to mesh requirements. Meshing , mesh quality checks. Material, properties (i.e. thickness ). i mprovements / recommendations. Loads , constraints ( boundary conditions ).

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CAD import

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  1. HyperMeshIntroduction CAD Final Design • CAD import • Geometrycleanup / repair • Preparegeometryaccordingtomeshrequirements • Meshing, meshqualitychecks • Material, properties (i.e. thickness) improvements/ recommendations • Loads, constraints (boundaryconditions) • Loadstep(s) • Export of FE solver deck • Analysis • Postprocessing

  2. HyperMeshIntroduction Import geometry: Fileimport After geometry was imported: Shadegeometryand activateBy 2D Topo Rememberthemeaning of rededges, greenedges, blueedges

  3. Geometry topology HyperMeshIntroduction • Topology” is how surfaces connect to adjacent surfaces of a part • Surface connectivity is controlled by the associated surface edges • If a surface edge is associated with more than 1 surface, those surfaces are considered to be connected (“equivalenced”) • Surface edges are categorized, named, and colored according to the number of associated surfaces: • T-junction edge (yellow) • Associated with 3 or more surfaces • Example: surfaces forming a T-connection • Surfaces are equivalenced • Free edge (red) • Associated with only 1 surface • Surfaces with a free edge between them are NOT equivalenced at that edge • Shared edge (green) • Associated with 2 surfaces • Surfaces are equivalenced • Suppressed edge (blue) • Surfaces are treated as though combined into 1 surface

  4. HyperMeshIntroduction Geometrytopology shared (=2 edges) Elements and nodesfollowgreenedges multiple (>=3 edges) Elements and nodesfollowyellowedges free (edge) Elements and nodesfollowrededges suppressed (previouslygreenedges) Elements and nodesfreelymoveacrossblueedges

  5. HyperMeshIntroduction Exercise: Geometrycleanup targetelementsize 15 mm 1 mm Question: Why do weneedtoimprove/repairgeometry?

  6. HyperMeshIntroduction Geometrycleanup targetelementsize 15 mm localelementsize 1 mm (display: elementshrink)

  7. HyperMeshIntroduction Geometrycleanup • Exercise • Improvegeometry • List errorsources • Documentworkingsteps (raw_data.iges) Question: Why do weneedtoimprove/repairgeometry? geom_demo.hm

  8. HyperMeshIntroduction Meshing Stopp, … somethingseemswrong. Gary Larson

  9. HyperMeshIntroduction Geometrycleanup & meshing • Exercise(geom_demo.hm) • 2D meshing • List errorsources • Documentworkingsteps (i.e.panels)

  10. HyperMeshIntroduction Meshing, meshqualitychecks After meshingchangevisoptions of geometryfromshadedtowireframe !! Shadedgeometryelementshardlyvisible Geometry in wireframemode, elementsshaded

  11. HyperMeshIntroduction Meshing, meshqualitychecks Where do you find theelementslater? 2Dautomesh Geom quick edit 2D  editelement

  12. HyperMeshIntroduction Meshing, meshqualitychecks Check elementquality Tool  check elements Isolate „failed“ elements: Save Failed ( Elemente in User Mark) Elements off ( Model Browser) Findelements (stored in theUserMark“ addadjacentelementstoselection

  13. HyperMeshIntroduction Meshing, meshqualitychecks Check elementquality „recommended“ numbers Warpage 20 Aspect 5 Skew … Min angle Quads 40 Max angle Quads 140 Min angle Tria 30 Max angle Tria 15 Length … Jacobian 0.5 Taper 0.5 / ?

  14. HyperMeshIntroduction Meshing, meshqualitychecks Geom tempnodes(deletetemporarynodes) Geom nodeedit 2D  replace(mergenodes)

  15. HyperMeshIntroduction Meshing, meshqualitychecks Meshcompatibility Free edges and t-connections In casefreeedgesor t-connectionsarefound HM creates a component named ^edges. ^edgescontains 1D elementsforvisualisationpurposes, whichhelpfindingtheproblemticspots in your model. Turn elements OFF, exceptthose in ^edges (use model browser), addadjacentelementsbyusing „unmaskadjacent“

  16. HyperMeshIntroduction Meshing, meshqualitychecks Add adjacentelements

  17. HyperMeshIntroduction Meshing, meshqualitychecks Tool project Tool translate

  18. HyperMeshIntroduction Tetraeder-meshing • Classicalworkingprocedure: • 2 D surfacemesh • Check Quality • Check forcompatibility (edges, t-connections)

  19. HyperMeshIntroduction Tetraeder-meshing selectsurfacemesh

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