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To add the polar stresses, we need to first define a polar coordinate system. In the outline tree, right click Coordinate System > Insert > Coordinate System. This will create a new Cartesian Coordinate System. To make the new coordinate system a polar one, look to the details view and change the Type Parameter from Cartesian to Cylindrical. To define the origin, change the Define By parameter from Geometry to Global Coordinate System. Put the origin coincident with the global coordinate systems origin (x = 0, y = 0). Now that the polar coordinates have been created, lets rename the coordinate system to make it more distinguishable. Right click on the coordinate system you just created, and go to Rename. For simplicity sake, let's just name it "Polar Coordinates".

Click here to enlarge image

Now, we can define the radial stress using the new coordinate system. Click Solution > Stress > Normal. This will create "Normal Stress 2", and list its parameters in the details view. We want to change the coordinate system to the polar one we just created; so in the details view window, change the Coordinate System parameter from "Global Coordinate System" to "Polar Coordinates". Ensure that the orientation is set to the x-axis, as defined by our polar coordinate system. Now the stress is ready. Let's rename it to Sigma_r and keep going.

Sigma_theta

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