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.

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Subjects: Materials