Knoop Hardness Test
An indentation hardness test using calibrated machines to force a rhombic-based pyramidal diamond indenter having specified edge angles, under specified conditions, into the surface of the test material and to measure the long diagonal after load removal.
See also: Brinell Hardness Test, File Hardness, Hardening, Superficial Rockwell Hardness Test, Vicker′s Hardness.
Subjects: Mechanical Engineering