Nothing to do with "woodpecker at your pecker"
From Wikipedia:
http://en.wikipedia.org/wiki/Charpy_impact_testThe Charpy impact test, also known as the Charpy v-notch test, is a standardized high strain-rate test which determines the amount of energy absorbed by a material during fracture. This absorbed energy is a measure of a given material's toughness and acts as a tool to study temperature-dependent brittle-ductile transition. It is widely applied in industry, since it is easy to prepare and conduct and results can be obtained quickly and cheaply. But a major disadvantage is that all results are only comparative
Rockwell scale
http://en.wikipedia.org/wiki/Rockwell_scaleThe Rockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload.[1] There are different scales, which are denoted by a single letter, that use different loads or indenters. The result, which is a dimensionless number, is noted by HRX where X is the scale letter.
The only thing worse than having to write and study reports about them is having to read reports from people who didn't learn how to properly write them or properly perform the tests.
Regards,
Gerald.