Rockwell Hardness Testing Review

Rockwell hardness testing is used to measure the overall hardness of polymer and metallic materials. It is known as the indentation resistance and measures the indentation’s permanent depth. In other words, when an indenter and a fixed force are used, and a small indentation is determined, it means that the material is hard. The value of indentation is achieved once the indentation area is measured in depth. According to ASTM E-18, this testing method is the most common hardness test method used. If you plan on leveraging the Rockwell test method, be sure first to get familiar with the set standards. With the right techniques, you will realise that this is the easiest hardness test method you will encounter and is the most accurate. Unless the surface of the structure is believed to introduce many variations, this test method can be used on any type of metal.

Rockwell hardness testing

How the Rockwell Test Works

The test begins after the indenter is pressed on the sample surface with a minor load. A major load introduction then follows. On the indenter, the force is decreased and the number calculated. Factors that come into play in the Rockwell hardness testing calculation is the indenter position variation before and after the introduction of the major load. The indenter is often made from diamond or steel ball. Understand that metal samples are different and therefore require different approaches. There are at least 30 Rockwell test scales, and they are all different. Each of them uses a different set of indenters and test forces. The right one is determined by the shape and the size of the test sample and the scale’s limitations.