Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.  CAD import  Geometry cleanup / repair  Prepare geometry according to mesh requirements  Meshing, mesh quality checks  Material, properties (e.g. thickness)  Loads, constraints (boundary conditions)  Export of FE solver deck  Analysis  Postprocessing  Loadstep(s) What do you need to run a FEM analysis? improvements / recommendations

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Prof. D. W. Dehmel Attention: Be consistent with your units!!! What do you need to run a FEM analysis?

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Create material In model browser, right mouse click, select material … Take care: A UserProfile (FEM Program) must be selected first CardImage (C.I.) MAT1: Linear, isotrop, temperaturunabahänig HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Create Property In model browser, right mouse click,select property … CardImage (C.I.) PSHELL / PSOLID: Select previously defined material: HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Assign properties / CardImages Select elements and assign property HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Select CardImage and material, confirm with update … Consider missing CardImage of a Property (Property exists already without specified CardImage) Missing or wrong CardImages … HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Missing or wrong CardImages … Select CardImage, confirm with update … Consider missing CardImage of a Material (material exists already without specified CardImage) HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Constraints (SPC) Analysis  constraints Dof1-3 translatation Dof4-6 rotation HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Pressure (PLOAD4) HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Defintion of Loadstep/subcase Analysis  loadsteps SPC = Single Point Constraint (Lagerung) Load = Belastung HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Be careful, if you deactive element quality check … Analysis  control cards General aspects HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Model: platte_mesh.fem Exercise: Set-up of a static FEM analysis (bracket) Think about modeling errors? T=3 mm L=W=100 mm F=180 N L W HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Exercise: Improve stifness of the bracket  insert a rib  Document working steps (panels)  List error sources  Results HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Exercise: Improve stifness of the bracket  morphing  Document working steps (panels)  List error sources  Results HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. use radius 20 mm, offset 20 mm N1, N2, N3 The Morphing technology employed in this exercise is implemented in the general finite element preprocessor HyperMesh „Enhancements“ HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Improved design … by „intuition“ ? … HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Model: platte_mesh.fem Exercise: Set-up of a static FEM analysis (bracket) Think about modeling errors? T=3 mm L=100 mm W=90 mm F=180 N L W HyperMesh Introduction

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Model: Winkel/platte_mesh.fem Create material Create property (C.I. Pshell; t=3) Assign property to elements Create loadcol and apply constraints (the bracket should be mounted/fixed at the holes) Create loadcol and apply forces Loadstep Run analysis Document displacements List likely modeling errors T=3 mm L=100 mm W=90 mm F=180 N L W HyperMesh Introduction Exercise: Set-up of a static FEM analysis (bracket)

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. ModelEThicknessU Vary modeling parameters (Thickness, Youngs modulus E):  Document working steps (panels)  List error sources  Results Exercise: Set-up of a static FEM analysis (bracket) HyperMesh Introduction