e FEA Demo version for tablet tutorial

Getting started

evolution-fea Open Source Finite-Element Code

Version 10.4 2D Demo Version for Tablet PCs Getting Started Tutorial 2012-03

evolution OSSP KG http://www.evolution-fea.com

evolution-fea Getting Started Tutorial 2D Demo Version for Tablet PCs

http://www.evolution-fea.com 2

Table of Contents Page

1 About the evolution Open Source Simulation Project 3

2 Functionality of the GUI 4

2.1 Opening Model File 5

2.2 Functionality for Visualization 6

2.3 Functionality for building Models 8

2.4 Functionality for evaluating computed Displacements 25

2.5 Functionality for evaluating computed Stresses 27

2.6 Functionality for evaluating computed Normal Modes 30

2.7 Online Help Functions 32

3 evolution-fea Example Problems 33

3.1 Static Analysis of a Cantilever Beam, 2D 33

3.2 Static Analysis of a Crane Hook, 2D 35

3.3 Static Analysis of a Hip Joint Prothesis, 2D 37

3.4 Static Analysis of a Main Bearing Wall, 2D 39

3.5 Normal Modes Analysis of a Cantilever Beam, 2D 41

4 evolution-fea Tutorial 42

4.1 Meshing & linear static Analysis of a Cantilever Beam 2D 42

4.1.1 Importing CAD Model 43

4.1.2 Generating FE Nodes 44

4.1.3 Popping-Up FE Elements 45

4.1.4 Defining Material Properties 47

4.1.5 Assigning Restraints 48

4.1.6 Applying Load 49

4.1.7 Saving Model on File & performing linear static Analysis 50

4.1.8 Evaluating Analysis Results 51

4.2 Meshing & linear static Analysis of a Crane Hook 2D 57

4.2.1 Importing CAD Model 58

4.2.2 Processing CAD Model for automatic Meshing 59

4.2.3 Generating hybrid Membrane Elements automatically 60

4.2.4 Defining Material Properties 61

4.2.5 Assigning Restraints 62

4.2.6 Applying Load 63

4.2.7 Saving Model on File & performing linear static Analysis 64

4.2.8 Evaluating Analysis Results 65

4.2.9 Refining Mesh locally & re-calculating Stress Distribution 68

5 Modifying the Initialization File 72



AK32 Task Force Members

1 About the evolution Open Source Simulation Project

Developing better products faster & at reduced costs...

given economic, ecological & technological challenges force companies to take convenient measures to

achieve both a higher productivity and a better quality of their products.

With this respect the evolution Open Source Simulation Project has been designed to initiate a radical change

towards simulation based product development, and to be a key driver for developing better products faster and at

reduced costs, across all industries.

The project builds on the highly advanced Simulation

Software evolution-fea which was born out of the AK32

Task Force 'Engine Simulation' of the German car makers

Audi, BMW, Daimler, Porsche & VW recently and on an

Open Source Business Model.

Open sourcing the evolution-fea Code means that you are

given the complete source code. And, the code does not

have a use-by-date or sunset clause. You can use it now

and forever, and you have the entire open source

community provide ongoing development and support.

About evolution-fea

evolution-fea has been designed to boost the state-of-the-art of simulation in structural mechanics, and it is

primed for optimizing CAE processes with respect to accuracy, speed & costs. Among its key features are:

hybrid Finite Elements for analysis results close to reality

iterative solvers for very short analysis times

highly advanced algorithms for nonlinear analyses of structural dynamics & acoustics

automatic FE meshing & knowledge based systems

hardware independence and support for virtual PCs

best-in-class usability

This 2D Demo Version has been designed to illustrate core functionality of the evolution-fea code. It focusses on

hybrid membrane elements and supports Tablet PCs. Please download your free Persional Version of the FTN95

Fortran Compiler from http://www.silverfrost.com and install it on your PC prior to working with evolution-fea.

And, don't hesitate to contact us if you have any questions.



2 Functionality of the 2D GUI

The graphical user interface (GUI) of evolution-fea- offers tailored functionality for pre- & post-processing. Self-

explaining pull-down menus and ease-of-use icon technologies are available for processing CAD data, generating

FE models, defining restraints & loads, and evaluating analysis results by just a few mouse clicks. NO

KEYBOARD IS REQUIRED!

The related features and steps of operation are described in the following chapters.

Issues: Opening Model File (Chapter 2.1) Functionality for Visualization (Chapter 2.2) Functionality for building Models (Chapter 2.3) Functionality for evaluating computed Displacements (Chapter 2.4) Functionality for evaluating computed Stresses (Chapter 2.5) Functionality for evaluating computed Normal Modes (Chapter 2.6) Online Help Functions (Chapter 2.7) Sample File: c:\e-fea\xamples\mbw2.xfe Model File

Main Bearing Wall Pre- & Post-Processing Samples



2.1 Opening Model File

Steps: '1 Select ' '2 Select Model File Name from List'

Selecting Model File Name from List

or: '2 Select ' '3 Specify Model File Name'

Opening Model File

Specifying Model File Name



2.2 Functionality for Visualization

Main Bearing Wall with Restraints & Loads

Denotation:

Steps: '1 Activate ' '2 Click/hold left Mouse Button' '3 Drag Mousecursor to define Window'

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '



Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Specify Direction of Motion by clicking a Vector Tip of '

Denotation:

Steps: '1 Select ' Note: 'Modify Raster Width by clicking Icon with right Mouse Button & selecting numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Specify Size of displayed Area'

Denotation: < Create Screen-Shot>

Steps: '1 Select < Create Screen-Shot>' '2 Specify PCX File Name by selecting alpha-numerical Keyboard Icons'



2.3 Functionality for building Models

Main Bearing Wall with Restraints & Loads

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '

Denotation:

Application: see Page 10f

Denotation:




Denotation:

Application: see Page 14ff

Denotation:


Denotation:


Denotation:


Denotation:




Sub Icons of

Main Bearing Wall CAD Wireframe

Denotation:

Steps: '1 Read CAD Wireframe Model' '2 Select '

Denotation:

Steps: '1 Activate ' '2 Select CAD Elements by Mouseclicks' '3 Select '

Denotation:

Steps: '1 Select '



Denotation:

Steps: '1 Activate ' '2 Select CAD Elements by Mouseclicks'

Denotation:

Steps: '1 Select '



Sub Icons of

Main Bearing Wall FE Model

Denotation:

Steps: '1 Activate ' '2 Create/Delete Nodes by Mouseclicks or create Nodes by editing Coordinates with numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Specify new Nodal Position by Mouseclicks or by editing Coordinates with numerical Keyboard Icons'' '3 Select Node for Translation'

Denotation:

Steps: '1 Activate ' '2 Move Mousecursor to specific Node to indicate ID'



Denotation:

Steps: '1 Read CAD Wireframe Model' '2 Activate ' '3 Specify Target Nodal Distance using numerical Keyboard Icons'

Denotation:




Sub Icons of


Denotation:

Steps: '1 Activate ' '2 Select Nodal Points to define Element'

Denotation:

Steps: '1 Activate ' '2 Select four Nodal Points to define Macro' '3 Specify No. of Elements to be generated by selecting Input Fields and numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Move Cursor inside Nodes of Target Element' '3 Click left Mouse Button to generate Element'



Denotation:

Steps: '1 Activate ' '2 Move Cursor inside Nodes of Target Element' '3 Click left Mouse Button to generate Element'

Denotation:

Steps: '1 Activate ' '2 Select Elements by Mouseclicks or Window' '3 Select '

Denotation:

Steps: '1 Activate ' '2 Select Elements by Mouseclicks or Window' '3 Select '

Denotation:

Steps: '1 Activate ' '2 Specify Element Type & Quality Criteria by selecting Input Fields and numerical Keyboard Icons'

Denotation:

Steps: '1 Select '



Denotation:

Steps: '1 Acticate ' '2 Select Elements by Mouseclicks'

Denotation:

Steps: '1 Acticate ' '2 Click/hold left Mouse Button' '3 Drag Mousecursor to define Window'

Denotation:

Steps: '1 Select '



Sub Icons of


Denotation:

Steps: '1 Activate ' '2 Select CAD Model Area by Mouseclicks' '3 Activate ' '4 Specify Target Element Length by selecting numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Specify CAD Model Area by Mouseclicks' '3 Acticate ' '4 Specify Target Element Length by selecting numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Select CAD Model Area by Mouseclicks'



Denotation:

Steps: '1 Select '



Sub Icons of

Main Bearing Wall Material Property IDs

Denotation:

Steps: '1 Activate ' '2 Specify Target Material ID by selecting numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Specify Properties for Target Material ID by selecting Input Fields and numerical Keyboard Icons'

Denotation:

Steps: '1 Activate ' '2 Select Elements by Mouseclicks'



Denotation:


Denotation:

Steps: '1 Select '



Sub Icons of

Main Bearing Wall Assigned Restraints

Denotation:

Steps: '1 Select Nodes by Mouseclicks or Window' '2 Select '

Denotation:


Denotation:




Denotation:

Steps: '1 Select restrained Nodes by Mouseclicks or Window' '2 Select '

Denotation:

Steps: '1 Activate ' '2 Select Nodes by Mouseclicks'

Denotation:




Sub Icons of

Main Bearing Wall Applied Loads

Denotation:

Steps: '1 Select Nodes by Mouseclicks or Window' '2 Activate ' '3 Specify Nodal Forces by selecting Input Fields and numerical Keyboard Icons'

Denotation:

Steps: '1 Select loaded Nodes by Mouseclicks or Window' '2 Select '

Denotation:

Steps: '1 Activate ' '2 Select Nodes by Mouseclicks'



Denotation:




2.4 Functionality for evaluating computed Displacements

Icons

Main Bearing Wall Computed Deformation

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Activate ' '2 Specify Fringe Values by selecting Input Fields and numerical Keyboard Icons'



Denotation:

Steps: '1 Activate ' '2 Specify Deformation Scale Factor by selecting numerical Keyboard Icons'

Denotation:

Steps: '1 Select '

Denotation:


Denotation:

Steps: '1 Select '



2.5 Functionality for evaluating computed Stresses

Icons

Main Bearing Wall Computed Stress Distribution

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '



Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Activate ' '2 Specify Fringe Values by selecting Input Fields and numerical Keyboard Icons'

Denotation:




Denotation:


Denotation:

Steps: '1 Select '



2.6 Functionality for evaluating computed Normal Modes

Icons

Main Bearing Wall Computed Normal Mode

Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Activate ' '2 Specify Normal Mode ID by selecting numerical Keyboard Icons'

Denotation:




Denotation:

Steps: '1 Select '

Denotation:

Steps: '1 Select '



2.7 Online Help Functions

Moving the mousecursor to an icon makes the Icon Functionality be displayed in the status line at the bottom right

corner of the evolution-fea GUI. And, the related Steps of Operation can be triggered directly within the GUI by

clicking the icon with the right mouse button.

Online Help Function Examples:

Pre-Processing

Post-Processing



3 evolution-fea Example Problems

3.1 Static Analysis of a Cantilever Beam, 2D

Sample Files:

c:\e-fea\xamples\cbeam2.xfe Model c:\e-fea\xamples\cbeam2.pch Results

Element Type: hybrid Membrane Elements No. of Nodes: 63 No. of Elements: 40

FE Model with Restraints & Load

Displaying/Specifying Material Properties



Indicating applied Nodal Load

Indicating computed Nodal Displacements

Indicating Reference Stress Value



3.2 Static Analysis of a Crane Hook, 2D

Sample Files:

c:\e-fea\xamples\chook2.xfe Model c:\e-fea\xamples\chook2.pch Results


FE Model with Restraints & Loads


Indicating Displacement Component y



Indicating Reference Stresses (zoomed View)



3.3 Static Analysis of a Hip Joint Prothesis, 2D

Sample Files:

c:\e-fea\xamples\hjproth2.xfe Model c:\e-fea\xamples\hjproth2.pch Results


Model, Restraints & Load (Body Weight & Muscle Tension)

Displaying Material Property IDs




3.4 Static Analysis of a Main Bearing Wall, 2D

Sample Files:

c:\e-fea\xamples\mbw2.xfe Model c:\e-fea\xamples\mbw2.pch Results


Model with Restraints, Assembly & Gas Loads

Displaying Material Property IDs




3.5 Normal Modes Analysis of a Cantilever Beam, 2D

Sample Files:

c:\e-fea\xamples\cbeam2.xfe Model


FE Model with Restraints

Displaying List of computed Frequencies

Displaying 1st Order Bending Mode, 830 Hz



4 evolution-fea Tutorial

4.1 Meshing & linear static Analysis of a Cantilever Beam

Computed Reference Stresses

Input File:

c:\e-fea\xamples\cbeam2.dxf CAD Model File DXF Format Steps: Importing CAD Model (Chapter 4.1.1) Generating FE Nodes (Chapter 4.1.2) Popping-Up FE Elements (Chapter 4.1.3) Defining Material Properties (Chapter 4.1.4) Assigning Restraints (Chapter 4.1.5) Applying Load (Chapter 4.1.6) Saving Model on File & performing linear static Analysis (Chapter 4.1.7) Evaluating Analysis Results (Chapter 4.1.8)



4.1.1 Importing CAD Model

Operation: 'Read CAD Wireframe Model from File'

Steps: '1 Select ' '2 Specify File Name by selecting alpha-numerical Keyboard Icons'

Opening CAD Model File

Specifying Input File Name (DXF Format)

2D Wireframe being displayed



4.1.2 Generating FE Nodes

Operation: 'Generate Nodes on CAD Elements'

Steps: '1 Select ' '2 Specify Target Nodal Distance, or Element Length respectively by selecting numerical Keyboard Icons'

Activating Generation of Nodes on CAD Wireframe

Specifying Target Nodal Distance

Generated Nodes being displayed



4.1.3 Popping-Up FE Elements

Operation: 'Pop-Up 4-noded hybrid Membrane Elements'

Steps: '1 Activate ' '2 Move Mousecursor inside Nodes of Target Element' '3 Click left Mouse Button to pop-up Element'

Moving Mousecursor inside Target Element

Popping-Up 4-noded hybrid Membrane Element



Operation: 'Refine Mesh'

Steps: '1 Activate ' '2 Click/hold left Mouse Button & drag Mousecursor to define Window' '3 Select '

Selecting Elements by Window

Activating Splitting of selected Elements

Splitted Elements being displayed



4.1.4 Defining Material Properties

Operation: 'Specify Material Properties'

Steps: '1 Activate ' '2 Specify Properties for Default Material ID 1'

Activating Specification of Properties

Specifying Membrane Properties by selecting numerical Keyboard Icons



4.1.5 Assigning Restraints

Operation:

Steps: '1 Select Nodes by Window' '2 Select '

Selecting Nodes by Window to assign Restraints

Assigning Restraints

Assigned Restraints being displayed



4.1.6 Applying Load

Operation:

Steps: '1 Select Node by Mouseclick' '2 Activate ' '3 Specify Nodal Forces by selecting Input Field and numerical Keyboard Icons'

Selecting Node to assign Load

Specifying Load

Assigned Load being displayed



4.1.7 Saving Model on File & performing linear static Analysis

Operation: 'Save Model on File & perform linear static Analysis'

Steps: '1 Select ' '2 Specify File Name by selecting alpha-numerical Keyboard Icons' '3 Select '

Saving Model on File

Specifying Output File Name

Performing linear static Analysis



4.1.8 Evaluating Analysis Results

Evaluating Displacements Operation: 'Display & evaluate computed Nodal Displacements'

Steps: '1 Select ' '2 Activate & specify Scale Factor with numerical Keyboard Icons'

Switching to Evaluation of computed Displacements

Specifying Deformation Scale Factor

Scaled Deformation being displayed



Operation: 'Underlay with undeformed Mesh & indicate Displacements'

Steps: '1 Select ' '2 Move Mousecursor to specific Node to indicate computed Nodal Displacements'

Undeformed Mesh being superposed

Indicating Nodal Displacements



Operation: 'Zoom View & indicate Displacement Component x'

Steps: '1 Activate ' '2 Click/hold left Mouse Button' '3 Drag Mousecursor to define Window' '4 Select ' '5 Move Mousecursor to specific Node to indicate Displacement Component'

Zooming Front End Section

Indicating Displacement Component x



Evaluating Stresses Operation: 'Display & evaluate computed Nodal Stresses'

Steps: '1 Select and Von-Mises Reference Stresses are being displayed by Default'

Switching to Evaluation of computed Nodal Stresses

Reference Stresses being displayed



Operation: 'Zoom View & indicate Stress Value'

'1 Activate ' '2 Click/hold left Mouse Button' '3 Drag Mousecursor to define Window' '4 Move Mousecursor to specific Node to indicate Stress Value'

Zooming Rear End Section




Operation: 'Display Normal Stresses Sigma-X'

Steps: '1 Select to display Model full-screen' '2 Select '

Displaying computed Normal Stresses X



4.2 Meshing & linear static Analysis of a Crane Hook

Computed Reference Stresses

Input File:

c:\e-fea\xamples\chook2.dxf CAD Model File DXF Format Steps: Importing CAD Model (Chapter 4.2.1) Processing CAD Model for automatic Meshing (Chapter 4.2.2) Generating hybrid Membrane Elements automatically (Chapter 4.2.3) Defining Material Properties (Chapter 4.2.4) Assigning Restraints (Chapter 4.2.5) Applying Load (Chapter 4.2.6) Saving Model on File & performing linear static Analysis (Chapter 4.2.7) Evaluating Analysis Results (Chapter 4.2.8) Refining Mesh locally & re-calculating Stress Distribution (Chapter 4.2.9)



4.2.1 Importing CAD Model

Operation: 'Read CAD Wireframe Model'

Steps: '1 Select ' '2 Specify File Name by selecting alpha-numerical Keyboard Icons'

Opening CAD Model File

Specifying Input File Name (DXF Format)

2D Wireframe being displayed



4.2.2 Processing CAD Model for automatic Meshing

Operation: 'Mask Pin Axes to create closed Area for Meshing'

Steps: '1 Activate & zoom Pin Section' '2 Activate ' '3 Select Pin Axes by Mouseclicks' '4 Select '

Zooming Pin Section

Selecting CAD Elements by Mouseclicks

Pin Axis masked



4.2.3 Generating hybrid Membrane Elements automatically

Operation: 'Generate 4-noded hybrid Membrane Elements automatically'

Steps: '1 Activate ' '2 Select closed Wireframe Area by Mouseclick' '3 Activate ' '4 Specify Target Element Length or confirm Default Length'

Selecting closed Wireframe Area

Confirming Default Target Element Length

Generated Mesh being displayed



4.2.4 Defining Material Properties

Operation: 'Specify Material Properties'

Steps: '1 Activate ' '2 Specify Properties for Default Material ID 1 by selecting numerical Keyboard Icons'

Activating Specification of Properties

Specifying Membrane Properties



4.2.5 Assigning Restraints

Operation:

Steps: '1 Select Pin Area Nodes by Mouseclicks' '2 Select '

Selecting Nodes to assign Restraints

Assigning Restraints

Assigned Restraints being displayed



4.2.6 Defining Load

Operation:

Steps: '1 Select Nodes by Mouseclicks or Window' '2 Activate ' '3 Specify Nodal Forces by selecting Input Field and numerical Keyboard Icons'

Selecting Nodes to assign Loads

Specifying Loads

Applied Loads being displayed



4.2.7 Saving Model on File & performing linear static Analysis

Operation: 'Save Model on File & perform linear static Analysis'

Steps: '1 Select ' '2 Specify File Name by selecting alpha-numerical Keyboard Icons' '3 Select '


Specifying Output File Name

Performing linear static Analysis



4.2.8 Evaluating Analysis Results

Evaluating Displacements Operation: 'Display & evaluate computed Nodal Displacements'

Steps: '1 Select ' '2 Select ' '3 Move Mousecursor to specific Node to indicate Displacements'

Switching to Evaluation of computed Displacements

Indicating Nodal Displacements



Operation: 'Evaluate Displacement Components y'

Steps: '1 Select ' '2 Move Mousecursor to specific Node to indicate Displacement Component y'




Evaluating Stresses Operation: 'Display & evaluate computed Nodal Stresses'

Steps: '1 Select and Von-Mises Reference Stresses are being displayed by Default' '2 Move Mousecursor to specific Node to indicate Stress Value'

Switching to Evaluation of computed Nodal Stresses




4.2.9 Refining Mesh locally & re-calculating Stress Distribution

Operation: 'Switch back to Pre-Processing Mode & refine Mesh locally'

Steps: '1 Select ' '2 Activate ' '3 Select Elements by Window & select '






Operation: 'Refine Mesh in high stressed Area'

Steps: '1 Activate & zoom lower Crane Hook Section' '2 Activate ' '3 Select Elements by Window & select ' '4 Update Loads in refined Mesh Section>'

Zooming lower Crane Hook Section






Indicating updated Loads Operation: 'Save Model & perform linear static Analysis'

Steps: '1 Select ' '2 Select '




Performing linear static Analysis Operation: 'Display deformed Structure & evaluate computed Stresses'

Steps: '1 Select to display the deformed Structure' '2 Select ' '3 Von-Mises Reference Stresses are being displayed by Default' '4 Move Mousecursor to specific Node to indicate Stress Value'




5 Modifying the Initialization File

By modifying the default values of the Initialization File XFEP.INI you are able to design the evolution-fea

GUI according to your individual needs or preferences. So, feel free to specify your favourite background colours,

define tailored criteria for your element quality checks, activate automatic storaging and/or choose among many

other options.

Excerpt of XFEP.INI:

Colour Code: 0= black 1= dark blue 2= dark green 3= cyan 4= dark red 5= magenta 6= brown 7= light grey 8= dark grey 9= light blue 10= light green 11= light cyan 12= light red 13= light purple 14= yellow 15= white

[General Issues] * Language (D=Deutsch, E=English) Sprache= E

[Colours] * GUI: f1= 15 Background of Display Area f3= 1 Background of Title Section f4 = 15 Text in Title Section . . . * FE Model: f80= 5 Nodes f81= 0 3- & 4-noded Elements f82= 12 Elements being built f83= 11 Rods & Beams f84= 2 Boundary Cond. 'Translations' f85= 9 Boundary Cond. 'Rotations' . . . [Elements] winkmin=45 min. allowable interior Angle [] winkmax=135 max. allowable interior Angle [] sv=4 max. allowable Aspect Ratio [] woelb=15 max. allowable Warping []

[Other Issues] * Symbol Size of Nodes, Bound Cond. etc. * (1=normal, 2=large, 0=no Symbol) ksymbg = 0 Element Nodes ksymbf = 1 free Nodes rsymb = 1 Boundary Conditions . . . *

* Beep after Analysis: sound= 1 1=active, 0=not active *

* Automatisches Speichern/Automatic Storaging: szeit= 0 Time in Minutes (0=no Storaging) . . .



Contact

evolution OSSP KG

Kaiserfeldgasse 2

A 8010 Graz / Austria

http://www.evolution-fea.com

Documents

e FEA Demo version for tablet tutorial