Quae probationes duritiae fiunt pro clavis caecis?

Inter probationes duritiae communes sunt: ​​duritia Rockwell (HR), duritia Rockwell superficialis (HR), duritia Vickers (HV), duritia Micro Vickers (HV), duritia Knoop (HK), duritia Brinell (HB), duritia Leeb (HL) (methodus resilitionis), probatio duritiae ultrasonica (UCI), duritia Shore (SHORE).

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