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hardness
(redirected from Dynamic hardness)

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hardness

The resistance of a material to indentation by various means, such as scratching, abrasion, wear, and drilling. Methods of heat treatment can increase the hardness of metals. A scale of hardness was devised by German–Austrian mineralogist Friedrich Mohs in the 1800s, based upon the hardness of certain minerals from soft talc (Mohs hardness 1) to diamond (10), the hardest of all materials.

Hardness is often measured by the Brinell hardness test. The hardness of water refers to the presence of dissolved minerals that prevent soap lathering and form scum, particularly compounds of calcium and magnesium. Treatment with a water softener may remove or neutralize them.



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It is, however, worth noting that Vingsbo and Hogmark (3) had previously defined a parameter that is similar to the tangential hardness, while others (4) had referred to the dynamic hardness as "specific grooving energy.
An integrated approach towards the study of scratch damage of polymer by Sue, H.-J. / JCT Research
Tabor's 1951 seminal work (1) included a chapter on dynamic hardness that was defined as the resistance of the metal to local indentation produced by a rapidly moving indenter.
Effect of loading rate upon conventional ceramic microindentation ... by Lloyd, Isabel / Journal of Research of the National Institute of Standards and Technology
The company's dynamic hardness testing instrument is said to enable surface evaluation of a wide range of materials in a variety of configurations, including extreme end surfaces and micro regions.
Dynamic hardness testing. (Instrument) by Rubber World
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