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Sigma-theta, the bending stress, is a function of r only as expected from theory. It is tensile (positive) in the top part of the beam and compressive (negative) in the bottom part. There is a neutral surface that delineates the tensile and compressive regions. Sigma-theta is zero on the neutral surface. We will use probe to locate the region where the bending stress changes from tensile to compressive. Click In order to find the neutral axis, lets first enlarge the geometry. Do this by clicking the Box Zoom tool Image Added then click a drag a rectangle around the area you want to magnify. Now, click the probe tool in the menu bar This will allow you to hover the cursor over the geometry at see the stress at that point. Hover the cursor over the geometry until you have a good understanding where the neutral axis on the beam is. To zoom out, click "Zoom to Fit" Image Added

We will next look at Sigma-theta along the symmetry line. Click Solution > Sigma-theta along symmetry in the outline window to bring up the stress distribution at the middle of the bar.

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