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What is Gc with reference to Griffith Theory?

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What is Gc with reference to Griffith Theory?

(a) Stress energy released

(b) Strain energy released

(c) Energy density

(d) Griffith constant

This question was addressed to me in unit test.

The query is from Fracture Toughness, Protection against Fracture topic in section Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct choice is (b) Strain energy released

The best explanation: Fracture toughness is regarded as the rate of strain energy released per unit area of the crack. Its SI unit is joule per meter square (J m^-2) and is denoted as Gc.

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