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Simple FEM Process

CAD. Final Design. Simple FEM Process. Teaching purposes Works with 3D geometry , only Easy to use ;“ brain “ still needed. Process oriented and automated. Simple FEM Process. 1. 2. 3. Simple FEM Process. Load exisiting HyperMesh model. Load exisiting CAD model.

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Simple FEM Process

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  1. CAD Final Design Simple FEM Process • Teaching purposes • Works with 3D geometry, only • Easy touse;“brain“ still needed Processoriented and automated

  2. Simple FEM Process 1. 2. 3.

  3. Simple FEM Process LoadexisitingHyperMesh model Loadexisiting CAD model Create CAD model onlyworkswith 3D geometry !!!

  4. Simple FEM Process Analytical solution F=180 N t=100 mm L=1000 mm b=100 mm Basic equations:

  5. Simple FEM Process Exercise: Set-up of a static FEM analysis(kragbalken.hm) • Documentworkingsteps (panels) • List errorsources Process: • CAD import • Geometrycleanup / repair • Preparegeometryaccordingtomeshrequirements • Meshing, meshqualitychecks • Material • Loads, constraints (boundaryconditions) • Loadstep(s) • Export of FE solver deck • Analysis • Postprocessing

  6. Simple FEM Process • Exercise(file: clip_3dgeometry.hm) • Employ 3D tetra / hexaelements, size: 3, 2, 1 mm • Force Fy = + 300 N, -300 N • Constraintsasdepicted • Material: steel • List errorsources • Documentworkingsteps and results 3 123 2

  7. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) • Create Mesh(solid geometryisrequired) - 3D  Tetramesh 3D  Tetramesh

  8. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) • Define Material Rightmouseclick in Model Browser  Create  Material  … •  Take care: A UserProfile (FEM Program) must beselectedfirst (=OPTISTRUCT) CardImage (C.I.) MAT1: linear, isotropic, temperature independent

  9. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) • Define Property Rightmouseclick in Model Browser  Create  Property  … CardImage (C.I.) PSHELL / PSOLID: 2D elements 3D elements Select previously defined material:

  10. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Define Property In model browser, rightmouseclick,selectproperty … CardImage (C.I.) PSHELL / PSOLID: alternatively … 2D elements 3D elements

  11. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Assign Properties / CardImages Select elements and assignproperty alternatively …

  12. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Create loadcollector … will beusedto „store“ constraints (SPC) NoCardImageneeded

  13. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) DefineConstraints (SPC) Analysisconstraints Dof1-3 translatation Dof4-6 rotation alternatively …

  14. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Create loadcollector … will beusedto „store“ forces(load) NoCardImageneeded

  15. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Defineforces Analysis  forces  alternatively …

  16. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Defineloadstep Analysis  loadsteps  SPC = singlepointconstraint LOAD = forces/pressure alternatively …

  17. Simple FEM Process theloadstep/subcase „combines“ Constraints SPC = Single Point Constraint and Forces Load = Force

  18. Simple FEM Process Correspondingsteps in HyperMesh(withoutProcess Manager) Run analysis Analysis  OptiStruct  specify*.fem file (not existingyet) Contourpanel

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