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Pre-Analysis & Start-up
Hand Calculations
It is highly recommended that one perform some sort of hand calculation to predict expected results before attempting a simulation. We call this
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"Pre-Analysis".
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The
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hand
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calculation
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can
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later
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be
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used
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to
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check
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the
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results
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of
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the
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simulation.
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We
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use
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Euler-Bernoulli
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beam
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theory
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to
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calculate
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the
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expected
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strain
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values
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at
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the
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gage
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center.
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Click
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to
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see
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the
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"Pre-Analysis"
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for
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the
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bike
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crank.
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Note
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that
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the
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hand
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calculation
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uses
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tensor
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shear
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strain
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while
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ANSYS
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reports
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engineering
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shear
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strain
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(which
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is
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two
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times
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the
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tensor
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shear
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strain).
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Open ANSYS Workbench
Now that we have completed the pre-calculations,
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we
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are
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ready
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to
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do
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a
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simulation
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in
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ANSYS
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Workbench!
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Open
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ANSYS
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Workbench
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by
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going
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to
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Start
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>
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ANSYS
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>
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Workbench
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.
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This
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will
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open
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the
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start
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up
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screen
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seen
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as
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seen
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below
To begin,
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we
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need
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to
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tell
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ANSYS
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what
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kind
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of
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simulation
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we
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are
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doing.
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If
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you
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look
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to
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the
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left
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of
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the
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start
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up
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window,
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you
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will
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see
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the
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Toolbox
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Window.
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Take
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a
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look
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through
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the
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different
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selections.
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The
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bicycle
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crank
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is
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a
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static
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structural
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simulation.
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Load
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the
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Static
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Structural
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tool
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box
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by
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dragging
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and
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dropping
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it
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into
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the
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Project
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Schematic.
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Name the Project Bike Crank .
Material
Now we need to specify what type of material we are working with. Double click Engineering Data and it will take you to the Engineering Data Menus.
If you look under the Outline of Schematic A2: Engineering Data Window, you will see that the default material is Structural Steel. The Problem Specification specifies the material's Modulus of Elasticity and Poisson ratio. To add a new material, click in an empty box labeled Click here to add a new material and give it a name. Our Material is Al 6061-T6. On the left hand side of the screen in the Toolbox window, expand Linear Elastic and double click Isotropic Elasticity to specify E and
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$\nu$ |
1E7, and set the Poisson Ratio to 0.33.Now that the Material has been specified, we are ready to import the geometry into ANSYS.
Continue to Step 2: Geometry
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