Question

What is the SI unit of fracture toughness?

(a) N m^-2

(b) J m^-2

(c) J m^-1

(d) N m^-1

I had been asked this question in an online quiz.

I'd like to ask this question from Types of Fracture in section Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

Answer 1

The correct option is (b) J m^-2

To explain I would say: Fracture toughness is regarded as the rate of strain energy released. Its SI unit is joule per meter square (J m^-2) and is denoted as Gc.