Hardness

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1. The ability of a surface to absorb energy imparted by an object colliding with it, or its shock absorbing properties.

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Schematic description of Rockwell Hardness Testing. Rockwell Formula: Hardness Rockwell HR = E – e. “E” is a constant of 100 (diamond) or 130 (ball) units. “e” is the penetration depth in units of 0.002mm.
Source: https://www.azom.com/article.aspx?ArticleID=12727