Catia FEM2

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FEM Surface

Preface

Getting Started

Basic Tasks

Glossary

Index

Dassault Systmes 1994-99. All rights reserved.

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Preface

ATIA -FEM SurfaceVersion 5 Release 5product allows you to rapidly generate a finitement model for complex surface parts.

provides users with automatic detail simplification without modifying the reference geomet

UsingThisGuide

MoreInformation

Preface

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Using This Guide

his book is intended for the user who needs to quickly become familiar with CATIA - FEMurfaceVersion 5 Release 5. The user should be familiar with basic CATIA Version 5 conceuch as document windows, standard and view toolbars.

o get the most out of this guide, we suggest you start reading and performing the step-by-s

torial "Getting Started". This tutorial will show you how to analyse a part from scratch.

he "Basic Tasks" section presents the main capabilities of the product. Each individual tas

arefully defined and explained in detail.

may also be a good idea to take a look at the "Workbench Description" section, presentin

e menus and toolbars.

nally, a "Glossary" has been provided to familiarise you with the terminology used in this

uide.

Using This Guide



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Where to Find More Information

rior to reading this book, we recommend that you read the CATIA Version 5 Infrastructureser's Guide.

ATIA - Part Design User's Guidemay also prove useful.

nd you should view the Conventions used in this guide.

More Information



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Getting Started

he aim of the following tutorial is to give you an idea of what you can do with CATIA - FEMurface. It provides a step-by-step scenario demonstrating how to use key capabilities.

he main tasks proposed in this section are:

EnteringtheWorkbenchDefiningaNewMesh

SettingConstraints

AnalysingQuality

Re-meshingaDomain

Altogether, this scenario should take about 15 minutes to complete.

Getting Started

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Entering the FEM Surface Workbench

This task demonstrates how to open a part and enter the FEM SurfaceWorkbench.

Before starting this scenario, you should be familiar with the basic commands commoall workbenches.

You can use the Sample01.CATPart document from the samples directory for this tas

1. Select File -> Open, and select the desired .CATPart file. This opens a Part Dedocument containing the selected part.

2. Select Start -> Analysis & Simulation ->Advanced Meshing Tools.The New Analysis Case dialog box isdisplayed.

3. Select an Analysis Case type (Static orFrequency).

Optionally, you can activate the "Keep asdefault starting analysis case" switch.

Click OK to enter the workbench.

Entering the Workbench



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Defining a New Mesh

This task demonstrates how to define a new mesh and it's global parameters onsingle part.

1.Click the Surface Mesh icon .

2. Select the geometry to be meshedby clicking on the part.

3. In the Global parameters dialog box,we define the mesh parameters.

In this example we:

set the Mesh size to 5 mmset the Sag value to 1 mmactivate the Detailssimplificationset the Minimum size to 2 mm

We leave the global method toquadrangle.

4. Click the OK button.

A new Smart Surfacic Mesh entity is

created in the tree.

Defining a New Mesh



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Setting Constraints

This task demonstrates how to define constraints on nodes distributions.

1. Click theAdd/removeconstraints

icon

2. Select theedge to be

constrained.

3. Click the Okbutton in theAdd/Removedialog box toend theconstraintsdefinition.

At thisstage,constraintsare kept inthe meshdefinition.

4. Click theNodesdistributions

icon .

Setting Constraints

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5. Select theedge onwhich a newdistributionwill be set.

6. In the Editnode

distributiondialog boxwe definetheparametersof the newdistribution.

Select theuniform

distributiontype and setthe numberof nodes to10.

Click the Okbutton. Thenodesdistribution

is created onthe selectededge.

Setting Constraints



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7.

In the Nodedistributionsdialog box,click the Okbutton toend thedistributionsdefinition.

At thisstage,distributionsare kept in

the meshdefinition.

Setting Constraints



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Meshing and Analysing Quality

This task demonstrates how to generate the mesh and use some basic quality anafunctionalities.

1.Click the Mesh icon .

The mesh is generated on the part and alittle summary is provided in the Meshupdate dialog box.

The visualization is switched to qualitymode so the user can see the quality ofthe generated mesh.

2.

Click the Quality Analysis icon .

The Quality Analysis dialog box lists theavailable quality specifications forvisualizing the mesh. By selectingparticular specifications, the user candecide how he wants to view the mesh. Italso provides a set of functionalities for

deeper analysis.

Quality Analysis functionalities areavailable at all steps of the meshingprocess.

See Quality Analysis for more detailedinformation.

Analysing Quality



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3.Click the Report icon .

The Quality Report dialog box presents statistics for the selected quality specificatio

Select the Mesh tab page to view mesh composition statistics.

4.Click the Single Analysis icon .

You can select an element of the meshand obtain a detailed view of it's quality inthe Analyze Single pane.

This allows you to check if any of yourspecifications have not beenimplemented.

Analysing Quality



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5. Click OK in the Quality Analysis dialogbox to exit the Quality Analysisenvironment.

Analysing Quality



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Re-meshing a Domain

This task demonstrates how to re-mesh a domain with local specifications.

1. Click the re-mesh icon

2. Select the domain to bere-meshed, as shown in thepicture.

We will try to remove thetriangles by locally alteringthe mesh method.

3. Set the parameters for theselected domain.

To do this, you specify the:

mesh methodlocal sizeimpact to neighbourdomains.

For this example, we will

specify a mapped mesh anda size of 5 mm.

And we specify that thesedomain specifications canaffect neighbour domains.

See Local Re-meshing formore detailed information.

Re-meshing a Domain



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4. Click OK to re-mesh thedomain. The mesh isupdated.

The domain is now meshedwith quadrangles only.

5.To exit the meshing environment, click the exit icon .

This completes the FEM Surface tutorial. Now, let's take a closer look at theapplication.

Re-meshing a Domain



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Basic Tasks

his section describes the basic tasks that allow you to complete the mesh of a part usingATIA - FEM Surface. These tasks include:

CleaningGeometry

Basic Tasks

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Cleaning Geometry

eometrical parts often present small holes or defects that should be ignored during the

nalysis. The clean geometry command is intended to let the user specify which of thesetails will be ignored by the mesher. It deals with three types of geometric problems:

Holes in the geometry.

Button hole - like gaps.

Cleaning Geometry

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Removing Holes

This first task shows you how to ignore holes in the geometry.


1. Create a new Mesh on the part.

2. Click the Remove

Holes icon

The diameterparameter is usedto ignore all holesthat are smaller

than the givenvalue.

3. Set the diametervalue to 10 mm andclick Apply.

See how theignored holes areturned blue.

Removing Holes

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4. Click a green hole.

It is turned blue andwill then be ignoredby the mesher.

5. Click a blue hole.

It is reactivated andwill be taken intoaccount by themesher.

Removing Holes



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Removing Button Hole Gaps

This task demonstrates how to configure the mesher to ignore button hole gaps


1. Create a newMesh on thepart.

Button holegaps areautomaticallydetected by theprogram andare displayed in

magenta on thepart.

2. Click the

Remove Holesicon .

3. You canconfigure themesher toignore buttonhole gaps bysimply clickingon the magenta

contours.

Now, they willbe ignored bythe mesher.

In fact, thefacing edges ofthe gap will bemerged and the




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result will beconsidered as astandard edge.




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Glossary

Crack A geometry defect that occurs when two adjacent faces, near the free edge

are not topologically linked.

Global size The target size for element edges.

Mminimum size Minimum size of an edge of an element. When the detail elimination option

active, the mesher does not generate elements with edges shorter than the

minimum size.

Part A 3D entity obtained by combining different features in the Part Design

workbench. Please see CATIA - Part Design User's Guidefor furtherinformation.

Glossary

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Index

C

eaning geometry

R

moving

holes

button hole gaps

ndex

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Catia FEM2

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