process in fea software
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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
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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.
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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,
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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
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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
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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
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CATIA Software
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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)
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WHAT IS MSC.NASTRAN?
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
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WHAT IS MSC.NASTRAN?
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
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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
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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
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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
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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.
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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.
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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