Testing hardness of specimens using a Rockwell B hardness testing machine.
Rockwell B machines are mainly used to indent Aluminum, brass, and soft steels via a 1/16-inch-diameter steel sphere.
Calibration of the apparatus was carried out using a hard steel specimen of known hardness, 92 Rockwell B.
Aluminium and steel specimens were tested to demonstrate the large difference in hardness, from 2 to 89 RW B.
An understanding of testing apparatus and need to calibrate was developed, as well as providing evidence from material in lectures.