دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A kind of standard that represent the hardness of material.Its code is HR.


hardness measuring scales relating penetration of a small indentation ball to ultimate yield strength, used to establish steel harness. Rockwell C scale is used in determination of metal hardness limit to control stress chloride cracking.

n: an arbitrarily defined measure of resistance of a material to indentation under static or dynamic load.