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Griffith theory is applicable for ______ materials.

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Griffith theory is applicable for ______ materials.

(a) All brittle

(b) Perfect brittle

(c) All ductile

(d) Perfect ductile

I had been asked this question during an interview.

My question is based upon Types of Fracture topic in portion Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct choice is (b) Perfect brittle

The explanation is: The stress required to cause brittle fracture varies inversely as the square root of crack length. From observation, we understand that Griffith theory is applicable only to perfect brittle materials like glass.

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