Explanation

A method to indicate the hardness value of an object, which belongs to the indentation method. The diamond cone indenter (with a top angle of 120 °) or the steel ball indenter (with a diameter of 1.588mm) are loaded twice respectively. The initial load p0 is applied first, and then the main load pm. The total load p=p0+pm. When the indenter is pressed into the surface of the object, an indentation with a depth of h will be left. The value of h is used as the value to measure the hardness of the object. It is specified that the difference between the constant K=0.2mm of diamond indenter (or the constant K=0.26mm of steel ball indenter) and h value is taken as the index of Rock well hardness. In order to enable the same hardness tester to measure objects with different degrees of hardness and softness, different indenters and total loads can be used to form several different Rock well hardness hardness scales.

Classification