Theories of Failure

Which theories are used to predict the failure of ductile material?

• Maximum-Normal-Stress Theory

• Maximum-Distortion-Energy Theory

• Maximum-Shear-Stress Theory

• Mohr's Failure Criterion

Which theories are used to predict the failure of brittle material?

• Maximum-Normal-Stress Theory

• Maximum-Distortion-Energy Theory

• Maximum-Shear-Stress Theory

• Mohr's Failure Criterion

Which effects determine the material's behaviour for the theory of failure?

• Rate of loading

• Temperature

• Type of loading

• Physical environment

Based on max-shear-stress theory, when is the failure in plane occured?

• two-in plane principal stress are opposite sign

• two-in plane principal stress are same sign

Based on max-shear-stress theory, when is the failure out of the plane occured?

• two-in plane principal stress are opposite sign

• two-in plane principal stress are same sign

Maximum shear stress theory : Yielding of material begin when absolute _____ shear stress reaches the shear stress that cause the same material to yield when subjected to only axial tension.

The strain-energy density is the energy per unit _____ of material.

Maximum-normal stress theory states that a brittle material will fail when maximum principal stress is _____ to the ultimate normal stress.

In Mohr's Failure Criterion stated in some brittle materials tension and _______ properties are different.

Creep: Material supports a load for a very long period of time, and continues to _______ until a sudden fracture/usefulness is impaired.