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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 the probe tool in the menu bar Image Added This will allow you to hover the cursor over the geometry at see the stress at that point.

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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In the details window, click Solution > Tau-r-theta to bring up the stress distribution for shear stress.

Click Hover 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 probe over points on the geometry far from the moment. You will notice that the stress is on the order of 10e-7. For a beam in pure bending, we assume that the shear stress is zero. However, ANSYS does not make this assumption: it calculates a value for shear stress at every point on the beam. Therefore, it is reassuring that the shear stress is almost negligible, which reinforces our assumption that it is zero.

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