At a point in a stressed material, the stress combination acting on a plane is a 90 kPa compressive stress and a 30 kPa shear stress, while on a perpendicular plane, the stress combination is 30 kPa...

At a point in a stressed material, the stress combination acting on a plane is a 90 kPa compressive stress and a 30 kPa shear stress, while on a perpendicular plane, the stress combination is 30 kPa compression and 30 kPa shear. Use the Mohr’s circle for this stress analysis.

(a) Determine the values of the major and minor principal stresses.

(b) Determine the angle between the major principal plane and the plane where the 90 kPa compressive stress acts.