[amp_mcq option1=”Guest’s or Trecas’ theory” option2=”St. Venant’s theory” option3=”Rankine’s theory” option4=”Von Mises’ theory” correct=”option4″]
The correct answer is: D. Von Mises’ theory
Von Mises’ theory is a failure theory that states that a material will fail when the equivalent stress reaches a critical value. The equivalent stress is a measure of the combined effects of all the stresses acting on a material.
Guest’s or Trecas’ theory is a failure theory that states that a material will fail when the maximum principal stress reaches a critical value. The maximum principal stress is the largest of the three principal stresses acting on a material.
St. Venant’s theory is a failure theory that states that a material will fail when the maximum shear stress reaches a critical value. The maximum shear stress is the largest of the two shear stresses acting on a material.
Rankine’s theory is a failure theory that states that a material will fail when the octahedral shear stress reaches a critical value. The octahedral shear stress is a measure of the combined effects of all the shear stresses acting on a material.
Von Mises’ theory is the most widely used failure theory because it is relatively simple to use and it gives good results for a wide range of materials.