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Hardness Testing: Definition of the test and basic principles
Definition of a hardness test.
Hardness testing may seem abstract and difficult to some people.
Mastering the vocabulary and knowing how to read a hardness value demystifies the subject.
Before developing the different testing principles, ROCKWELL, BRINELL, VICKERS, SHORE and LEEB, it is important to know how to define a hardness test in order to understand and be understood by your interlocutor.
IMPORTANT CONCEPT: THERE IS NO RELATIONSHIP BETWEEN THE DIFFERENT HARDNESS SCALES.
50HRC ≠ 50HRB ≠ 50HV10
The hardness test is defined by 3 criteria, letters and numbers. The hardness value is always placed before the test criteria.
General hardness test :
Checking the hardness of materials, whether metallic or not, is not that simple. Several methods are used: Brinell, Rockwell, Vickers, Knoop, Shore (and a few others less commonly used). It’s a question of choosing the most suitable one to obtain the correct result.
As a general rule, the load should be chosen so that the depth of the indentation is less than one tenth of the thickness of the part or the layer of a surface treatment.
While respecting this rule, it is advisable to apply the highest possible load to the indenter.
The lower the load, the more polished the surface of the measured area should be.