Workbench-Mechanical Assembly Contact

Goal:

– In this workshop our goal is to investigate the behavior of the pipe clamp assembly (Pipe_clamp.x_t) shown here. Specifically we wish to determine the crushing stress and deformation in a copper pipe section when the bolt in the clamp is torqued down.

-We will assume the material used for the pipe is a copper alloy while all other parts are steel.

-It is assumed the clamp is torqued to 1000 N when placed in service.

-We’ll assume the coefficient of friction between the clamp and pipe is 0.4. The other contact regions will be treated as either bonded or no separation as shown in the accompanying figures.

If previous workshop project is still in session, clear it from the project page

Utility Menu > File >New…

From the Toolbox, double click

“Static Structural” to create a new system.

1. RMB the geometry cell and “Import Geometry and browse to “Pipe_Clamp.x_t”

From the “Units” drop down menu:

– Set Project units to “Metric (Tonne, mm, s, C, mA, N, mV).

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

1. Double Click the “Model” cell to open the Mechanical Application

1. Once inside the Mechanical application, set the working unit systems

“Unit>Metric(mm,kg,N,s,mV,mA)”

1. Expand the “Connections” branch and use the shift key to highlight all contact definitions.

1. In the details window change the Formulation to “Augmented Lagrange.

1. Highlight the first contact branch. This is the definition for the pipe to clamp contact.

1. In the detail for the definition change the Type to “Frictional”.
2. Enter a value for “Friction Coefficient” of 0.4.

1. Highlight the second contact branch. This is the definition for the bolt shaft to clamp hole contact.

1. From the details window change the Type to “No Separation”.

The remaining 2 contact regions will be modeled using the default bonded type of contact.

Create a local coordinate system along the pipe’s axis. Note, we will use the local coordinate system for post processing later.

With the Coordinate system branch highlighted:

1. Select the inside surface of the cylinder.
2. “RMB > Insert > Coordinate System”.

1. From the detail for the new coordinate system change “Type” to “Cylindrical”.
2. Change the Principal Axis to the “Z” Direction
3. Defined by “Geometry Selection”
4. “Click to Change” on Geometry , then select the inner surface of the pipe and “Apply”

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