Notations and units:

= Normal stress, = Shear stress, = Angle

Units of the notations are in SI units.

Normal stress at an angle from the reference plane

Shear stress at an angle from the reference plane

Resultant stress

Angle between normal stress to one plane and resultant stress (angle of obliquity)

Maximum principal stress

Minimum principal stress

Angle of maximum principal stress from the reference plane

Angle of minimum principal stress from the reference plane

Angles of plane where shear stress is maximum

Maximum shear stress

Maximum normal stress on maximum shear plane