Finite Element Analysis Purpose

8/11/2019 Finite Element Analysis Purpose

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This cha ter includes material from the book “Pract ica l Fin

n a high level summary, the “working” steps involved in a finite e

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• sua za on o so u on resu s pos -process ng

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. o e n re- rocess n

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Most commonly, an FEM simulation process starts with the impo

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• ro en sur aces

• surfaces which are not stitched to ether

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ite Element Anal sis”. It also has been reviewed and has

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lement analysis may be categorized as:

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t of the component’s (or part’s) CAD geometry (e.g. CATIA, STEP,



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Another issue related to geometry is depicted in the following ima

In the image on the left, the imported geometry is shown. Note t

reen do not meet at a sin le oint i.e. there is a ver small la

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very poor qua y e emen s. e mage n e m e ep c s e

The u dated cleaned and meshed eometr is shown on the ri

ere, e sur ace e es n reen o no mee n a s n e po n , .meshing is carried out with respect to the surfaces, this small off

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Once t ese “ ur es are mastere , one nee s to as w et er a

and rounds tin holes or even com an lo os which can often be

Meshing

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mes or a so mes w e crea e . s mes ng s epdirectl reflects on the ualit of the results enerated. At the sa

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me a s a approx ma on o e s ruc ure uses muc ess e em

are waiting for your results).

See the icture above for structures that are t icall meshed

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ge:

he lateral offset of the green edges. Here, the surface edges (in

eral offset of the surface ed es. As meshin is carried out with

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es e n a geome ry. o e ow e mes s oca y s or e .

ht.

e. ere s a very sma a era o se o e sur ace e es. sset will be automatically taken into account during meshing,

t e CAD n ormat on s rea y nee e . W at a out tt e ets

found in CAD data? Do the reall contribute to the overall

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s cruc a o e n e e emen ana ys s as e qua y o e mesme time, the number of elements number of nodes affects the

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en s an us re uces e me w c s e me w e you

ith 1D, 2D and 3D elements. Which element t e would ou



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Despite the fact that meshing is (at least optionally) a highly aut

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Material And Pro ert Information

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elements.

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Various loads and constraints are added to the model to repr

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To determine our relevant loads our en ineerin skills are ne

even , a u o y mu a on m g e e p u .

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t e FEM so ver c osen or t e ana ys s e.g. RADIOSS or Opt Str

fi ure below.

As you will see, the bulk of information stored in the analysis file

defined b its nodal number ID and its x- - and z coordinates.

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mated process, mesh quality, its connectivity (i.e. compatibility),

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esent the loading conditions that the part(s) are subjected to.

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ded. Think of all kinds of load situations that can occur on our

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ct . A sect on out o an Opt Struct so ver ec s ep cte n t e

is related to the definition of nodes (or grids). Each single node is

Each element is then defined b its element number ID and its

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Dur ng t e so ut on p ase o a s mp e near stat c ana ys s or an

settin s of the Finite Element ro ram do handle these classes

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errors:

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• nsu c en y cons ra ne mo e e mo e s ows a r

a ta run vers ty.com e- earn ng y-a ta r-_2 ypermes -re ate

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e s mu a on resu s s one nex . resses, s ra ns, an e or

to the various loading conditions. Based on the results, modifica

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Remarks

• Practice will show that in man ro ects the above de icte

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s qu e o v ous a go ng ac o o app y c anges

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gen requency stu y, t ere s not muc or you to o. T e e au t

f roblems rett well. Practice will show ou that if the solution

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g o y mo on ue o ex erna oa s

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ee- yperwor s-starter- t-v eo-ser es

a ons are p o e an exam ne o see ow e par respon e

tions may be made to the part and a new analysis may be run to

rocess must be re-entered a ain because simulation results

n wor ng roug e en re process ecomes e ous.

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FEM model can be exported instantaneously (without any rem

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A nice introduction in mor hin is iven in the video below htt :

e n v ua wor ng s eps o e process are no on y su

loads. A lot of attention must also be aid to the chosen modeli

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”resu s ave ypasse errors s .

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shing) allowing the CAE engineer to re-run the analysis of the

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altair-2.wistia.com medias x c 10c4 2 .

ec e o many user errors e.g. ypo w e e n ng ma er a or

n assum tions for instance, sim lification of eometr , chosen

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Finite Element Analysis Purpose