Process in FEA Software

8/10/2019 Process in FEA Software

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Physical Problem

Finite Elements Model

Pre-processing

Results

FE Calculation

Typical ResultPost-processing

• CATIA-FEM

• PATRAN• ELFINI

• NASTRAN

• CATIA-SPM

• PATRAN

FEA Software



FEA Software

FEA for designer:

product is intended for the casual user

intuitive interface offers the possibility to obtain

mechanical behavior information with very fewinteractions

dialog boxes are self explanatory

require practically no methodology, all defining steps

being commutative.



FEA Software

FEA for analyst:

product is extensions of previous mentioned products

wide variety of engineering problems

Require basic understanding of FEA and methodologyof model development,



CATIA - Generative Part Structural Analysis (GPS) integratesadvanced pre-processing, solving and post-processingcapabilities.

It allows designers to perform associative part stress and

vibration analysis including contact analysis for theassessment of part mechanical behavior. Structural analysiscan be performed on volume parts, surface parts andwireframe geometries.

Promotes designer assessment of partsmechanical behavior and sizing.

CATIA Software



CATIA - Elfini Structural Analysis 2 (EST) extends thecapabilities of the CATIA - Generative Part StructuralAnalysis (GPS) product to include multiple analysis

cases for static, frequency, and buckling analysis.

Tailored to the needs of specialists whilemaintaining a consistent user interface

between specialists and design engineers.

CATIA Software



The Generative Assembly Structural Analysis (GAS)

product has been designed as an integrated extension to

Generative Part Structural Analysis enabling the study of

the mechanical behavior of a whole assembly. The product

has been conceived with the same "easy to learn" and "fun

to use" ergonomics principles.

The Generative Dynamic Analysis (GDY) product willlet you work in a dynamic response context.

CATIA Software



CATIA Software



WHAT IS MSC.NASTRAN?

MSC.Nastran is a general-purpose finite

element analysis program capable of solvinga wide variety of engineering problemsincluding:

•

Linear static analysis• Static analysis with geometric and material nonlinearity

• Transient analysis with geometric and material nonlinearity

• Normal modes analysis

• Buckling analysis

• Direct and modal complex eigen value analysis

• Direct and modal frequency analysis (including random

analysis)

• Direct and modal transient analysis (including response

spectrum analysis)




MSC.Nastran Capabilities

• Linear cyclic symmetry analysis (including static, normal

modes, buckling and direct frequency response)

• Linear and nonlinear steady-state heat transfer

• Linear and nonlinear transient heat transfer

• Aeroelasticity

• Substructure analysis (superelements)

• Design sensitivity and optimization

• Acoustics

• Composite material analysis

• P-element analysis




MSC.Nastran is• Extensively documented (including online encyclopedia)

• Extensively tested

• Continually enhanced with new capabilities

• High efficient using modern numerical analysis techniques

• Used extensively by aerospace, automotive, energy,biomedical, civil and other industries



WHAT IS MSC.PATRAN?

MSC.Patran is a CAE pre and post processing

software package. It consists of the following

major components:

• User-Friendly Graphical User Interface

• Powerful Geometry Import, Export and Creation• Robust Meshing Algorithms

• Fast Results Visualization and Reporting

• Extensive Analysis Code Preferences



SUMMARY OF PATRAN-NASTRAN WORKFLOW

MSC.Patran

Pre-Processing

Import/create geometry

Create finite element mesh

Apply boundary condition

Apply loads

Create material properties

Create element properties

Submit model to solver

Post-Processing

Deformation plots

Stress fringe plots

Reports

MSC.Nastran

Solver

Solve for displacements

Compute strainsCompute stresses



PATRAN-NASTRAN WORKFLOW AND FILES

MSC.Patran

Pre-Processing- Import/create geometry

- Create finite element mesh

- Apply boundary condition

- Apply loads

- Create material properties

- Create element properties

- Submit model to solver

Post-Processing

- Deformation plots

- Stress fringe plots

- Reports

MSC.NastranSolver

[ K ] {u} = {F}

- Solve for u

- Compute strain

- Compute stress

.bdf

.xdb

.op2

.f04

.f06

.log

.db

.ses

.db.jou



BASIC MSC.PATRAN FILES

File Extension File Type Comments

.db Database One per model.

.ses Session File A Session File is opened atPatran start-up and it is closed

when you quit MSC.Patran.

.db.jou Journal File One per model. Record of all PCL

commands from databasecreation to present. Link together

with the session files. EXTREMLY

useful for rebuilding a database.



BASIC MSC.NASTRAN FILES

File

Extension

File Type Comments

.bdf Input File Contains model defination. Popular

extensions are .bdf and .dat.

.f06 Result File This is the main Nastran output file. It

contains the results of your analysis such as

displacements and stresses. It is in ASCII

format so it can be viewed in any text editor.It also contains warning messages, error

messages and diagnostic messages to help

the user evaluate the quality of the analysis

results.

.f04 Execution

Summary File

Contains a time history of job execution.

.log Operating

System Log File

.op2 Results File Used by Patran for post processing.

.xdb Results File Used by Patran for post processing.



Consistent Systems of Units

Table contains some of the most commonly used

consistent systems of units:

System

of

Units

Input Output

Length ForceElastic

ModulusMass

Mass

Density1G Disp Force Stress

1 m N Pa kg kg/m39.807

m/sec2 m N Pa

2 mm N Mpa t or Mgt/mm3 or

Mg/mm3

9.807

m/sec2 mm N Mpa

3 ft lbf psf slug slug/ft3 32.17

ft/sec2 ft lbf psf

4 Input lbf psi lbf .s2 /in lbf .s

2 /in4 386.1

in/sec2 in lbf psi

Documents

Process in FEA Software