Hardness test. Engr. 3451 Lab: 2. Hardness. One if the mechanical properties that may be important to consider is hardness which is a measure of material’s resistance to localized plastic deformation Moha ( Minerals) Vikers Knoop Scleroscope Brinell Rockwell. Moha.
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Engr. 3451 Lab: 2
HR = E - eF0 = preliminary minor load in kgfF1 = additional major load in kgfF = total load in kgfe = permanent increase in depth of penetration due to major load F1 measured in units of 0.002 mmE = a constant depending on form of indenter: 100 units for diamond indenter, 130 units for steel ball indenterHR = Rockwell hardness numberD = diameter of steel ball