Question

The tensile strength required to break interatomic bonds across two adjacent planes is ________

(a) Y

(b) Y/2

(c) Y/4

(d) Y/6

The question was asked during an interview for a job.

My doubt stems from Types of Fracture topic in chapter Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

Answer 1

Correct option is (d) Y/6

For explanation I would say: Calculations for shear strength of perfect crystal has been found to be similar to that of two adjacent planes. It was determined that the tensile strength necessary to rupture interatomic bonds of two adjacent atomic planes is of the order of Y/6.