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What is Toughness Of Material ?

Toughness is a measure of  the amount of energy a material can absorb before actual fracture or failure takes place. For example, if a load is suddenly applied to a piece of mild steel and then to a piece of glass, the mild steel will absorb much more energy before failure occurs. Thus a mild steel is said to be much tougher than a glass.




The Toughness of a material is its ability to withstand both plastic and elastic deformations. It is therefore, a highly desirable quality for structural and machinable parts which have to withstand shock and vibration. Manganese steel, wrought iron, mild steel , etc. are tough materials.




The work or energy a material absorbs is sometimes called modulus of toughness. Toughness is related to impact strength, i.e., resistance to shock loading. 

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