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key principles of hardness material testing (Newage hardness testing, n.d…
key principles of hardness material testing (Newage hardness testing, n.d.)
hardness is the ability of a material to resist scratching, wear and tear and indentation.
hardness testing is a characteristic of a material not a fundamental property
destructive testing: material is destroyed cannot be used after it has being tested.
the smaller the indent the harder the material. measuring the permanent depth of the indentation.
material characteristics
• Can be used to predict Tensile strength
• Test to confirm process
• Test hardenability
• Test to check material
functionality
• Test to confirm ability to function as designed.
• Wear Resistance
• Toughness
• Resistance to impact
three main types of hardness tests
Rockwell:
pressing an indenter into the surface of the material with a specific load.
used for more thin materials and plastics.
The resulting Rockwell number represents the difference in depth from the zero reference position as a result of the application of the major load.
Brinell:
pressing a round indenter into a material with a specific load.
used for coarse material.
The Brinell harness number is calculated by dividing the load applied by the surface area of the indentation.
Vickers:
indenting a material with a fixed force.
Used for all materials.
The hardness value for a Vickers hardness test is converted from the length of the diagonal produced by the indenter.
