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Adding Initial Strain to a Structural Mechanics Model Tutorial


This is a supplementary video to the introductory
structural mechanics video found on our youtube channel.
In this example, you add a pin geometry to the bracket assembly. Then you specify an
initial strain to simulate that the pin is prestrained in the axial direction. The bracket_basic model has been opened for
this example. Right-click Model 1 and choose add physics.
Select Structural Mechanics,Solid Mechanics, and click next. Select stationary as the study
type and click Finish. In the Parameters table, add the values shown.
We are defining a strain value that corresponds to a reduction of the pin length from 216
mm to 215 mm. Next, the
pin geometry is added to the bracket assembly.
This is done by importing it into the existing geometry. The initial strain is specified under the
Linear Elastic material node. Clear the default selections from the list and select only domain
3, the pin. Enter InitStrain in the first cell of the
initial strain table. Right-click solid mechanics and choose More,
Fixed constraint. From the Selection list, choose Box 1.
Right-click the Study 1 node to compute the study. The default plot shows the von mises stress
in the bracket, with the largest stresses in the regions where the bracket arms are
joined to the bolt supports. Right-click results and add a 3D plot group,
then right-click 3D plot group 2 and select Surface to add a surface plot. Click replace
expression and go to Solid Mechanics, Strain, Strain Tensor and choose the X component.
Click plot to view the x-component of the strain throughout the structure. For a more in depth look at this model as
well as similar models and videos, visit our website.

Cesar Sullivan

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