Question

1. Residual stress refers to stresses induced by plastic strain. T or F
2. Failure criteria is identical for ductile and brittle materials. T or F
3. Statically indeterminate problems can be solved by using additional equations provided by Hooke's Law. T or F.
4. To analyze stress at any point of any component or structure , one should consider:
5. The stress developed in a cylindrical pressure vessel along the longitudinal axis is:

Answer 1

ANSWER 1

TRUE

RESIDUAL STRESS

It is the stress which remains inside the body despite load has been removed. When the body is deformed it undergoes two types of deformation one is elastic another is plastic.Elastic deformation is usually recovered while plastic deformation stays. When the body is stressed beyond the elastic limit, residual stress is induced in the body.

ANSWER 2

FALSE

Failure criteria is not identical for ductile and brittle materials.Ductile materials fail after undergoing significant amounts of plastic deformation while brittle materials do not undergo plastic deformation.

ANSWER 3

FALSE

A beam/structure becomes statically indeterminate when available equations are less than the number of unknowns. Statically indeterminate structures can be solved by using one of these such as Slope deflection method OR Flexibility method etc

ANSWER 4

. To analyze stress at any point of any component or structure ,one should consider

• Material is homogeneous and isotropic in nature
• Self weight should be neglected:
• Youngs modulus is same in tension as well as in compresssion

ANSWER 5

The stress developed in a cylindrical pressure vessel along the longitudinal axis is: Axial Stress OR Longitudinal Stress