Workshop 3.1 - Goals
-Workshop 3.1 investigates contact behavior on a simple assembly. It is meant to illustrate how rigid body motion can occur as a result of improper contact set up.
-Problem statement:
.The model consists of a simple Parasolid assembly file
.Our goal is to set up contact among the parts in the assembly and see how non symmetric loading can effect the results.
Workshop 3.1 - Assumptions
We’ll assume the friction between the arm shaft and the holes in the side plates is negligible. We’ll make the same assumption for the contact between the arm shaft and the stop shaft. Finally we’ll assume the stop shaft is fixed to each of the side plates.
Workshop 3.1 – Project Schematic
-Open the Project page.
-From the “Units” menu verify:
.Project units are set to “US Customary (lbm, in, s, F, A, lbf, V).
.“Display Values in Project Units” is checked (on).
1.In the Toolbox, double click “Static Structural” to create a new analysis system.
2.RMB on the “Geometry” cell and “Import Geometry”. Browse to “Contact_Arm.x_t”.
Workshop 3.1 - Preprocessing
3.Double click the “Model” cell to open the Mechanical application.
4.Set the working Unit System:
Units > U.S Customary (in, lbm, lbf, °F, s, V, A)
5.RMB the “Connections” branch and “Rename Based on Definition”.
-The result is contact regions are now defined with respect to the parts associated with each. Notice the type of contact (e.g. bonded, etc.) is also shown.
6.Based on the assumptions stated earlier change 3 of the contact regions to “No Separation” as shown here:
a.Use the CTRL key and select the 3 contact regions shown here.
b.In the details change the contact type to “No Separation”.
-Each contact region could be changed individually, selecting all 3 merely saves time.
Workshop 3.1 - Environment
7.Fix the assembly (highlight the “Static Structural” branch (A5):
a.Select the 2 faces on the ends of the Side Plates.
b.RMB > Insert > Fixed Support.
http://www.cadfamily.com/html/Article/Contact%20Control-Goals_640_1.htm
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