Question

Guest theory is

• A. maximum shear stress theory
• B. maximum principal strain theory
• C. minimum shear strain theory
• D. maximum principal stress theory

Answer 1

Answer:

A. maximum shear stress theory

Guest theory is based on the maximum shear stress theory and is also known as Guest and Tresca's theory. According to this theory, failure occurs when the maximum shearing stress at any point reaches the failure value equal to that developed at yielding in an axial tensile or compressive test of the same material. The equation for no failure is $\tau_{max}\le \frac{\sigma_y}{ 2}$