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Mohr's Stress Circles
You can click in the grey area for the spherical angle to adjust the normal direction.
The rulers below adjust the active principle stresses.
How to read the construction for normal and tangential stresses?
Is there always a normal direction with only tangential stresses?
See also the
Wikipedia-article on Mohr's Circles
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Spherical Angle:
1st Principle Stress
-2.
2nd Principle Stress
0.325
3rd Principle Stress
1.99