Question

Consider the following statements:
1. Failure occurs beyond elastic limit.
2. Rupture takes place immediately after elastic limit.
3. Permanent set occurs beyond elastic limit
Which of these are considered in the theories of failure? ·

• A. $1,2$ and $3$
• B. $1$ and $3$ only
• C. $2$ and $3$ only
• D. $1$) and $2$ only

Answer 1

The correct option is B $1$ and $3$ only

A material is said to have failed when it is stressed beyond the elastic limit and permanent deformation occurs. Failure of a material represents either direct separation of particles from each other (brittle fracture) or slipping of particles (ductile fracture or yielding) accompanied by considerable plastic deformations. Failure does not necessarily mean rupture