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Hardness and impact test of metals: An experiment using the Rockwell hardness test and the Brinell hardness test (Macroindentation measurements)

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ING Group Greece - Sidma SA - Telesis Securities

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  1. Abstract
  2. Defining hardness
  3. Measuring hardness
    1. Macro-hardness (macroindentation) measurement
    2. Micro-hardness (microindentation) measurement
    3. Nano-hardness (nanoindentation) measurement
  4. Hardness testing
    1. Rockwell test
    2. Brinell test
    3. Impact test
  5. The experiment
    1. Description of apparatus
    2. Procedure
    3. Summary of results
  6. Observations and conclusions
  7. Discussion of results
  8. Comparison of Rockwell test and Brinell test
  9. References

Solid material objects come in contact with each other, exerting and transferring forces. The outcome from this contact is subject to the relative hardness of each material and to the magnitude of the stresses induced relative to their yield or fracture strengths. In order to predict accurately what can happen because of this contact, the hardness of materials is tested and measured.

This paper investigates Hardness and Impact Test of Metals. In particular, it focuses on performing hardness tests on various metal specimens using the Rockwell Hardness Tester and the Brinell Hardness Tester (macroindentation measurements).Then it investigates the relation between the hardness numbers to tensile strength and it performs impact test on steel specimens.

[...] This paper focuses on performing hardness tests on various metal specimens using the Rockwell Hardness Test and the Brinell Hardness Test (macroindentation measurement). a. Rockwell Test Rockwell Test is a hardness test that measures the degree of penetration into a metal caused by a diamond or ball indenter that is applied under a fixed load (Davis, 1998). An indenter is pressed into the surface of the metal to be tested under specific load for definite time interval. After the load is released the depth of the indentation is measured. [...]

[...] Hardness is evaluated by converted read diameter into Brinell hardness number (BHN) by the formula: L BHN = where: L - Load - D d ) D Ball diameter d Diameter of the indentation c. Impact Test Toughness is the ability of material to withstand big loads without breaking. Toughness is related to strength. Resilience is the ability of a material to absorb impact without breaking or permanently deforms. The amount of energy absorbed up to the elastic limit is called modulus of resilience. [...]

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