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Mechanica Tutorial
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Pro/Mechanica Tutorial
Getting Started
The first thing we need is to create our initial design concept. To keep it simple, we will start out with an L
bracket.
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Create a part in Pro/E and name it BRACKET.
Create default datums and default coordinate system.
Create an L-shaped protrusion with a depth of 5.00 as shown below. Select DTM1 as your sketching
plane and DTM2 as your top reference. (Take note of the sketch below in reference to the datum
planes).
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Create a 1.00 inch fillet round as a separate feature as pictured below.
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This will represent our initial design concept. At this point we would like to learn a few things about this shape:
1. Will it carry our load in an efficient manner ?
2. Where is it the weakest ?
3. Can we better utilize our material and how ?
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Access Pro/MECHANICA from the part menu by selecting MECHANICA.
Since we will be doing structural analysis, select STRUCTURE
Then lets start to define our MODEL.
Operating Environment
The process of assigning material properites, constraints and loads to our model is analogous to setting up our
operating environment. The information we provide will indicate how our model is fastened or restricted, what
external forces are acting on it, and what are the material characteristics of our model.
Material Properties
Material properties can be assigned from the existing library or created as needed. For our bracket we will use
Steel, which exists in the material library.
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Select MATERIAL then ASSIGN it to the PART.
For this exercise we will use STEEL_IPS as shown below.
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Idealizations
Idealizations allow you to apply Shells, Beams, Masses, Springs and Spot
Welds to your model. We can simplify this model (to speed up computations)
by representing it as a plate. Mechanica will create a mid-plane between the
two surfaces we've selected. This mid-plane will then be used to analyze the
model.
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Select SHELLS followed by PAIRS and then DEFINE PAIR. Select the far
and near side surfaces as shown below. By doing this you are manually
creating the pairing for Mechanica to use.
Show the pair by selecting COMPRESS from the shell menu. The yellow surface in the center of our
bracket represents the mid-plane.
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Constraints
We will apply one constraint by fixing the back of our bracket, simulating a weld or several fasteners. By
applying this constraint the back surface of the bracket will not be able to move or rotate in any direction.
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Select CONSTRAINTS and select the rear edge as shown below.
FIX the Displacement and Rotation in all directions.
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Loads
We will apply a load on the foot of our L bracket.
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Select LOADS and EDGE/CURVE and select the edge as shown below.
Apply a load in the Y direction of -100.
Analysis
We've completed defining our environment for our model. The next step will be to create and run an analysis.
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Select ANALYSIS and name it bracket_1.
Set the Convergence to 10% and Max Polynomial Order to 9.
Confirm that the boxes for Stresses, Rotations, and Reactions are checked.
Remember, the user determines the accuracy of the solution by specifying the convergence percentage.
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Now we have completed our analysis form and are ready to run it.
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Select RUN from the Mech Struct menu.
Confirm brack_1 is highlighted and select START.
As the problem is solving you can examine the status of the solution by selecting SUMMARY
Results
To view results in Mechanica you first need to create a results window in which you select what you want to