Hardness Testing (Leaving Cert Engineering): Flashcards

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Hardness Testing
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Hardness testing measures

Material's resistance to scratching/permanent deformation

Indenter definition

Hard object pressed into material surface during testing

Indentation size: softer vs harder materials

Softer: larger indentations; Harder: smaller marks

Widget in hardness testing

Small test piece positioned on machine table

Indenter material requirement

Must be made from extremely hard materials

Vickers method indenter shape

Diamond pyramid

Vickers indentation shape

Square impression

Vickers method measures

Diagonal lengths of square indentation

VHN stands for

Vickers Hardness Number

Brinell method indenter shape

Hardened steel sphere

Brinell indentation shape

Circular depression

Brinell method measures

Diameter of circular indentation

BHN stands for

Brinell Hardness Number

Method for wider hardness ranges

Vickers

Method better for softer materials

Brinell

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Non Destructive Testing (NDT)

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Non Destructive Testing (NDT)

Mechanical Testing (Destructive Testing)

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Non Destructive Testing (NDT)

Mechanical Testing (Destructive Testing)

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Non Destructive Testing (NDT)

Mechanical Testing (Destructive Testing)

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