Question

How is fracture stress defined?

(a) MN m^-2

(b) J m^-2

(c) mm

(d) GN m^-1

This question was posed to me in a job interview.

Question is taken from Types of Fracture in chapter Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

Answer 1

The correct choice is (a) MN m^-2

The explanation is: Fracture is defined as the breaking of a material into multiple parts. The fracture stress is defined as meganewton per square meter or MN m^-2 and is denoted by σf.