Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Simple...

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.

Simple FEM Process

CAD

Final DesignP

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an

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Teaching purposes Works with 3D geometry, only

Easy to use;“brain“ still needed


1.

2.

3.

Simple FEM Process


Load exisiting HyperMesh modelLoad exisiting CAD modelCreate CAD model

only works with 3D geometry !!!

Simple FEM Process


L=1000 mm b=100 mm

t=100 mm

I yELFxw 33)0(

123tbI y

zI

LFI

Myy

b3

F=180 N

Basic equations:

Analytical solution

Simple FEM Process


Document working steps (panels) List error sources

Process:

CAD import Geometry cleanup / repair Prepare geometry according to mesh requirements

Meshing, mesh quality checks

Material

Loads, constraints (boundary conditions)

Export of FE solver deck

Analysis

Postprocessing

Loadstep(s)

Exercise: Set-up of a static FEM analysis (kragbalken.hm)

Simple FEM Process


Exercise (file: clip_3dgeometry.hm)

Employ 3D tetra / hexa elements, size: 3, 2, 1 mm Force Fy = + 300 N, -300 N Constraints as depicted Material: steel List error sources Document working steps and results

3

2123

Simple FEM Process


Corresponding steps in HyperMesh (without Process Manager)

Create Mesh (solid geometry is required)

- 3D Tetramesh

3D Tetramesh

Simple FEM Process


Define Material

Right mouse click in Model Browser Create Material …

-


Take care:A UserProfile (FEM Program) must be selected first (=OPTISTRUCT)

CardImage (C.I.) MAT1:linear, isotropic, temperature independent

Simple FEM Process


Define Property

Right mouse click in Model Browser Create Property …


CardImage (C.I.) PSHELL / PSOLID:

2D elements 3D elements

Select previously defined material:

Simple FEM Process


Define Property In model browser, right mouse click,select property …

CardImage (C.I.) PSHELL / PSOLID:

alternatively … 2D elements 3D elements


Simple FEM Process


Assign Properties / CardImages

Select elements and assign property

alternatively …


Simple FEM Process


Create loadcollector … will be used to „store“ constraints (SPC)

No CardImage needed


Simple FEM Process


Define Constraints (SPC)Analysisconstraints

Dof1-3 translatationDof4-6 rotationalternatively …


Simple FEM Process


Create loadcollector … will be used to „store“ forces (load)

No CardImage needed


Simple FEM Process


Define forces

Analysis forces


alternatively …

Simple FEM Process


Define loadstep

Analysis loadsteps

SPC = single point constraint

LOAD = forces/pressure


alternatively …

Simple FEM Process


the loadstep/subcase „combines“ConstraintsSPC = Single Point Constraint and Forces Load = Force

Simple FEM Process


Run analysis

Analysis OptiStruct specify *.fem file (not existing yet)

Contour panel


Simple FEM Process

Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Simple...

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