under construction

= normal (main) tension , = tangential tension , Max [traction(positive)] and minimum [compression(negative)] of normal (main) Tensions and tangent tensions who wheels to right(positive, coming from up the axis) and tangent tensions who wheels to left(negative, coming from down the axis)

the angle measures the inclination of the plane where the normal and tangential tensions act, on their reference axis


,
see the double angle , then

,


verified by and only




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the angle applied to this equation then:


then ,


the Sigma Normal tensions (x) and (y) of the squared element of the plan chosen in one point of the volumetric mass (to calculate the stress state in that point), lie opposed on the same axis of Mohr circle where 180 degrees = 90 degrees of squared element

Formulas to calculate the tensions and to build the Mohr circles:

,


the Center of the circumference is and its Radius

TO BE CONTINUED...................

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