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Mohr's Circle
Plane stress transformation: principal stresses and where they act, the largest shear in the plane and out of it, von Mises stress, and the stresses on the element at any angle — drawn as you type.
What the circle means and how to read it: Mohr's circle, explained.
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Stress state
Tension positive. τxy is positive when it pushes in +y on the +x face.
Rotate the element
The buttons round to whole degrees; the exact angles are in the results.