Question

For ductile materials the most appropriate failure theory is

• A. Maximum shear stress theory
• B. Maximum Principal stress theory
• C. Maximum Principal strain theory
• D. Shear strain energy theory

Answer 1

Answer:

D. Shear strain energy theory

The most appropriate failure theory for ductile materials is the Shear Strain Energy Theory (option 4). It states that failure occurs when the strain energy of distortion per unit volume absorbed at any point is equal to the strain energy of distortion absorbed per unit volume at any point in a bar stressed to the elastic limit under the state of uniaxial stress. This theory gives economic design as compared to the Maximum Shear Stress Theory.