FEM Surface Preface Glossary Index - Freedunet.nicolas.free.fr/CATIAV5/maillage_de_surface.pdf ·...

FEM Surface

Preface

Getting Started

Basic Tasks

Glossary

Index

© Dassault Systèmes 1994-99. All rights reserved.

TOC

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PrefaceCATIA - FEM Surface Version 5 Release 5 product allows you to rapidly generate a finiteelement model for complex surface parts.

It provides users with automatic detail simplification without modifying the reference geometry.

Using This GuideMore Information

Preface

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Using This GuideThis book is intended for the user who needs to quickly become familiar with CATIA - FEMSurface Version 5 Release 5. The user should be familiar with basic CATIA Version 5 conceptssuch as document windows, standard and view toolbars.

To get the most out of this guide, we suggest you start reading and performing the step-by-steptutorial "Getting Started". This tutorial will show you how to analyse a part from scratch.

The "Basic Tasks" section presents the main capabilities of the product. Each individual task iscarefully defined and explained in detail.

It may also be a good idea to take a look at the "Workbench Description" section, presentingthe menus and toolbars.

Finally, a "Glossary" has been provided to familiarise you with the terminology used in thisguide.

Using This Guide


Where to Find More InformationPrior to reading this book, we recommend that you read the CATIA Version 5 InfrastructureUser's Guide.

CATIA - Part Design User's Guide may also prove useful.

And you should view the Conventions used in this guide.

More Information


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

The main tasks proposed in this section are:Entering the Workbench

Defining a New MeshSetting ConstraintsAnalysing Quality

Re-meshing a Domain

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

Getting Started

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Entering the FEM Surface WorkbenchThis task demonstrates how to open a part and enter the FEM SurfaceWorkbench.

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

You can use the Sample01.CATPart document from the samples directory for this task.1. Select File -> Open, and select the desired .CATPart file. This opens a Part Design

document 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


Defining a New MeshThis task demonstrates how to define a new mesh and it's global parameters on asingle 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 iscreated in the tree.

Defining a New Mesh


Setting ConstraintsThis task demonstrates how to define constraints on nodes distributions.

1. Click theAdd/removeconstraints

icon

2. Select theedge to beconstrained.

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 Editnodedistributiondialog boxwe definetheparametersof the newdistribution.

Select theuniformdistributiontype and setthe numberof nodes to10.

Click the Okbutton. Thenodesdistributionis created onthe selectededge.

Setting Constraints


7.

In the Nodedistributionsdialog box,click the Okbutton toend thedistributionsdefinition.

At thisstage,distributionsare kept inthe meshdefinition.

Setting Constraints


Meshing and Analysing Quality

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

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 fordeeper analysis.

Quality Analysis functionalities areavailable at all steps of the meshingprocess.

See Quality Analysis for more detailedinformation.

Analysing Quality


3.Click the Report icon .

The Quality Report dialog box presents statistics for the selected quality specifications.

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


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

Analysing Quality


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 willspecify 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


4. Click OK to re-mesh the

domain. 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


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

Cleaning Geometry

Basic Tasks

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

analysis. The clean geometry command is intended to let the user specify which of thesedetails 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 HolesThis first task shows you how to ignore holes in the geometry.

You can use the Sample03.CATPart document from the samples directory for this task.

1. Create a new Mesh on the part.

2. Click the Remove

Holes icon

The diameterparameter is usedto ignore all holesthat are smallerthan 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


Removing Button Hole GapsThis task demonstrates how to configure the mesher to ignore button hole gaps.

You can use the Sample02.CATPart document from the samples directory for this task.

1. Create a newMesh on thepart.

Button holegaps areautomaticallydetected by theprogram andare displayed inmagenta on thepart.

2. Click theRemove Holes

icon .3. You can

configure themesher toignore buttonhole gaps bysimply clickingon the magentacontours.

Now, they willbe ignored bythe mesher.

In fact, thefacing edges ofthe gap will bemerged and the

Removing Button Hole Gaps


result will beconsidered as astandard edge.

Removing Button Hole Gaps


Glossary

Ccrack A geometry defect that occurs when two adjacent faces, near the free edges,

are not topologically linked.

Gglobal size The target size for element edges.

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

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

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

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

Glossary

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IndexC

cleaning geometry

Rremoving

holes

button hole gaps

Index

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