Results Processing

Workshop 8.1 - Goals

-In this workshop a high pressure vent assembly is analyzed for stress and deflection.

-Some of the results from the analysis will be difficult to interpret if all bodies are active during postprocessing. Our goal is to isolate parts of the model and use some of the advanced Workbench-Mechanical features for postprocessing.

Workshop 8.1 - Assumptions

-We will assume that gas is being vented through the inlet pipe into the expansion chamber. Inside the chamber the pressure drops to 20% of the inlet pressure.

-The expansion chamber is rigidly mounted to the inlet thus we will leave this contact region defined as bonded.

-The support bracket allows limited movement to the pipe so no separation contact will be used here.

.See the contact description on the next page.

-The inlet pipe and bracket are modeled using structural steel while the expansion chamber is Polyethylene.

Workshop 8.1–Part/Contact Description

Workshop 8.1–Project Schematic

Open the Project page.

From the Units menu verify:

-Project units are set to “Metric (kg, mm, s, C, mA, mV).

-“Display Values in Project Units” is checked (on).

1.From the Toolbox double click “Static Structural” to create a new system.

2.Double click “Engineering Data” to access material properties.

3.From “General Materials” Click the ‘+’ next to “Polyethylene” to add this material to the current system.

4.“Return to Project”.

5.RMB the geometry cell and “Import Geometry” and browse to “Pressure_System.x_t”.

6.Double click the “Model” cell to open the Mechanical application.

7.Set the working unit system:

“Units > Metric (mm, kg, N, s, mV, mA)”.

8.Change materials on the expansion chamber:

a.Highlight the part in the tree.

b.In the detail window click in the material field and change the material assignment to Polyethylene.

9.Modify the bracket to pipe contact behavior:

a.Highlight “Contact Region 2” in the Connections branch.

b.In the details window change the contact “Type” to “No Separation”.

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