AE4131 ABAQUS Lecture Part II

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AE4131ABAQUS LecturePart II

• Patrick Roberts
• gt0398b_at_prism.gatech.edu
• x5-2773
• Weber 201

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Overview

• What is ABAQUS CAE?
• Why learn ABAQUS CAE?
• Online Tutorials
• Sample problem
• Some helpful hints

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What is ABAQUS CAE?

• ABAQUS CAE provides a complete modeling and
  visualization environment for ABAQUS analysis
  products. With direct access to CAD models,
  advanced meshing and visualization, and with an
  exclusive view towards ABAQUS analysis products,
  ABAQUS/CAE is the modeling environment of choice
  for many ABAQUS users.
• (From www.abaqus.com)

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Why learn ABAQUS CAE?

• Building input files by hand for large or complex
  models are too difficult.
• Build most models very quickly
• Gives you a method to import models created by
  other software packages.
• Allows for Python scripting.

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ABAQUS CAE files

• ABAQUS CAE creates a binary file with a .cae file
  extension.
• When viewing your results it uses the .odb and
  .fil files
• CAE created an input file to run the analysis.
• You can import an input file to CAE to manipulate
  the model.

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ABAQUS CAE structure

• In CAE you make parts, then assemble those parts
  into a model which is then analyzed.
• To work through these step you will work with
  individual modules in CAE.

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CAE layout
Menu bar
Title bar
Toolbar
Context bar
Message area or command line interface
Canvas and drawing area
Prompt area
Viewport
Toolbox area
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ABAQUS CAE modules

• Part Create individual parts
• Property Create and assign material properties
• Assembly Create and place all parts instances
• Step Define all analysis steps and the results
  you want
• Interaction Define any contact information
• Load- Define and place all loads and boundary
  conditions
• Mesh Define your nodes and elements
• Job Submit your job for analysis
• Visualization- View your results

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Online tutorials

• ABAQUS CAE has three very good tutorials
• Simple 3D cantilever beam
• Two hinges/ rigid pin assembly
• Viewing and working with your output

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Starting ABAQUS CAE
You can start ABAQUS CAE from the START menu or
with a command line by typing abaqus cae in a
Command window. TIP You should open a Command
Window, navigate to the directory you want to
use, and finally, start ABAQUS CAE via command
line. This way all your results files will end
up in this directory (where you want them!).
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Plane stress problem

• To start learning ABAQUS CAE we will work through
  building a cantilevered beam that is subjected to
  a pressure load on the top of the beam of 0.5
  MPa.
• This will be a plane stress problem so it will
  have unit thickness. The length of the beam is
  200 mm, height is 25 mm.

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Part Module

• Create a new part as
• 2-D planar
• Type Deformable
• Basic feature shell
• Approximate size

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Your plane stress part
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Property Module

• We will add the material Steel and give it values
  of 209 103 MPa and Poisson's ratio of 0.3.
• We will create a section called BeamSection and
  give it a category of solid, type Homogeneous.
• We then assign this material to this section.

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Assembly Module

• We will create one instance of this beam.

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Step Module

• We will add a step after the system created
  Initial step called Load Step.
• The procedure type is General and the type is
  Static.
• For the output we want stresses, strains,
  displacements, forces/reaction.

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Load Module

• We want to fully constrain (encastre) the left
  end of the beam. Fixed boundary conditions must
  be placed in the system created Initial step. We
  will call this boundary condition Fixed.
• The pressure load must be added in the step we
  created earlier called Load Step. Call this load
  Pressure and it has a value of 0.5 and is applied
  to the top of the beam.

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Beam with BCs and loading
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Mesh Module

• First we need to decide on the Mesh controls. In
  this case we will use quadrilateral.
• Next we choose element type. Under Family you
  will see Plane stress highlighted. If we choose
  linear with reduced integration we will be using
  the following element.
• CPS4R A 4-node bilinear plane stress
  quadrilateral, reduced integration, hourglass
  control.

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Mesh Module (cont.)

• We need to define how course/fine the mesh will
  be by the use of seeds.
• The system will suggest a seed value. To make
  the mesh finer enter a smaller number. Larger
  numbers will make the mesh more course.
• The system suggested 20 so well choose 15.

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Mesh Module (cont.)

• When we mesh this instance we get the following.

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Job Module

• We will create a job called 2DPlaneStressBeam
• Once this has been created just submit the job.
• The analysis should only take a couple of
  minutes.

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Visualization Module

• Once your analysis is complete we want to see the
  results.
• If we look at Von Mises stress distribution we see

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Stress distribution
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Additional Results

• To see additional results choose Field Output and
  you can choose the type of output you would like
  to see. It will only show you what you initially
  choose in the Step Module.
• All of the results files are in the directory you
  started CAE in. For any errors, warning or other
  system data on how the analysis ran look at those
  files.

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Some additional tips

• If you want to capture an image for later
  placement in a paper you need bring up the view
  you want to capture, then print to a file. If
  you are using Word then use the TIFF format. If
  you use Latex use the eps format.