Meyer hardness test

For cold worked materials the Meyer hardness is relatively constant and independent of load, whereas for the Brinell hardness test it decreases with higher loads.

For annealed materials the Meyer hardness increases continuously with load due to strain hardening.

[2] Based on Meyer's law hardness values from this test can be converted into Brinell hardness values, and vice versa.

[3] The Meyer hardness test was devised by Eugene Meyer of the Materials Testing Laboratory at the Imperial School of Technology, Charlottenburg, Germany, circa 1908.

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This graph shows the differences between the Brinell hardness test and the Meyer hardness test. Notice that the Brinell test can report the same hardness value for a given specimen twice depending on the load.