Around , Martens proposed the following definition for hardness testing: &#;Hardness is the resistance of a body to the indentation by another (harder) body.&#; This simple but precise definition has taken its place in technical circles, and is just as valid today as it was then. Technical hardness is a mechanical characteristic used to describe a material or the state of a material.
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Hardness cannot be measured directly, but is derived from primary measured variables (for example test load, indentation depth, indentation area). Depending on the test method, the hardness value is determined from one of the following:
Hardness definition What does hardness depend on? Measuring hardness Objective of hardness testing Overview of hardness test methods Static & dynamic hardness test methods Common standards Categorization of load ranges Variations of load applications History
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It seems as though I have to learn this myself every couple years. I just looked for the requirement for 20 minutes myself and I believe the actual quarterly requirement comes from the family of AMS specifications that we use. However, with all the revision changes to the spec family recently I am unable to put my finger on it right now. I am sure it came from a specification flow down somewhere other than E-18 or the NADCAP checklist. This is the most restrictive calibration frequency requirement we have so I use it. If I come across it, I will post where it comes from for us here. This quarterly requirement may not flow down to you. Personally, I would never recommend going 12 months between calibrations under any circumstance even if I could. Not sure if this helps you.
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