2) patran overview

S1 - 1PAT301, Section 1, May 2010Copyright© 2010 MSC.Software Corporation

OVERVIEW


WHAT IS Patran?● 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


WORKFLOW IN Patran● The Main Menu

2 - Import Geometry

1 - Select Analysis Code

2 - or Build Geometry

3 – Create Analysis Model

5 - Evaluate and Publish Analysis Results

4 - Perform the Analysis


WORKFLOW IN Patran (Cont.)● The following case study demonstrates how Patran is used

in a typical engineering application


CASE STUDY: ENGINE PISTON HEAD● The design team has created a preliminary engine design.

Determine if the piston head has been designed properly to withstand the pressure loading.


CASE STUDY: ENGINE PISTON HEAD● Design Specifications

● Material: Steel● = 30 x 106 psi● = 0.3

● Operating pressure = 1200 psi

1200 psi


STEP 1 - CREATE DB AND SET ANALYSIS PREFERENCE

● Patran can interface with many analysis codes● Select Nastran and Structural Analysis for this case study

Open a new database in Patran.

Select MD Nastran and Structural Analysis for this case study.


STEP 2 - IMPORT OR BUILD GEOMETRY● The user can import or build geometry in Patran:

● Import geometry models from CAD systems:● CATIA● I-DEAS● Pro/ENGINEER● Unigraphics

● Import geometry models in standard formats:● Parasolid xmt● ACIS● IGES● STEP

● Build the geometry model in Patran


STEP 2 - IMPORT OR BUILD GEOMETRY (Cont.)● For this case study, the piston head geometry model is

available as a parasolid xmt file● Import this model directly into Patran


STEP 2 - IMPORT OR BUILD GEOMETRY (Cont.)

Import the piston head geometry.


STEP 2 - IMPORT OR BUILD GEOMETRY (Cont.)● The piston head geometry is imported


STEP 3 - CREATE ANALYSIS MODEL● Next, create the analysis model:

Create a finite element meshApply boundary condition

Apply loadingCreate material and element

properties


STEP 3 - CREATE ANALYSIS MODEL (Cont.)

Create the finite element

mesh.



Constrain the two cylindrical holes at the piston-pin interface.


Apply 1200 psi to the top surface.



Define a material

property for the piston head.



Create an element property for the piston

head.



STEP 4 - PERFORM THE ANALYSIS

Submit the model to Nastran for a linear

static analysis.


STEP 5 - EVALUATE ANALYSIS RESULTS

Read the analysis results

into Patran.


STEP 5 - EVALUATE ANALYSIS RESULTS (Cont.)

Plot displacements and stresses.


Publish a stress

summary report.



Create static, animated, and vrml images for

reports and presentations.



SUMMARY OF Patran WORKFLOWPatran

MD Nastran

Pre-Processing

● Import/create geometry ● Create finite element mesh● Apply boundary condition● Apply loads● Create material properties● Create element properties● Submit model to solver

Solver

● Solve for displacements● Compute strains● Compute stresses

● Deformation plots● Stress fringe

plots● Reports

Post-Processing


WHAT IS MSC/MD NASTRAN?● MSC/MD Nastran is a general-purpose, finite

element analysis program capable of solving a wide variety of engineering problems including:● 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 eigenvalue analysis● Direct and modal frequency analysis (including random analysis)● Direct and modal transient analysis (including response spectrum

analysis)


WHAT IS MSC/MD NASTRAN? (Cont.)● Linear cyclic symmetry (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-elements

2) patran overview

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