# Which Theory is Also Called Stress Difference Theory?

By Sakshi Yadav|Updated : August 10th, 2022

Maximum normal/Principal stress theory/Rankine's theory is also called Stress Difference Theory. This theory assumes that failure occurs when the maximum principal stress at any point reaches a value equal to the tensile stress at the failure of a simple tensile specimen. This theory does not consider the effects of two other principal stresses.

The vertical distance of the total effective earth pressure from the top of the wall = y̅. For a triangular pressure distribution, we know that y̅ = (H/3) at the base of the wall. The failure surface plane forms an angle α = 45 + (ɸ/2) with the significant principal plane.

Summary:

## Which Theory is Also Called Stress Difference Theory?

Stress Difference Theory is also called Maximum normal/Principal stress theory/Rankine's theory. Stress Difference Theory states that the failure of mechanical components subjected to biaxial or triaxial stress occurs when the maximum principal stress reaches the yield point or maximum strength of the material.