Question

According to guest's Theory, the maximum shear stress in the material is equal to
the maximum and minimum principal stress​

Answer 1

guest's Theory, the maximum shear stress in the material is equal to

Explanation:

According to this theory, the failure or yielding occurs at a point in a member when the maximum shear stress in a bi-axial stress system reaches a value equal to the shear stress at yield point in a simple tension test. Mathematically,

זmax = זyt /F.O.S.

Where

זmax = Maximum shear stress in a bi-axial stress system,

זyt = Shear stress at yield point as determined from simple tension test,

F.O.S. = Factor of safety.