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Knoop hardness test
The Knoop hardness test is a microhardness test – a test for mechanical hardness used particularly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes. A pyramidal diamond point is pressed into the polished surface of the test material with a known (often 100g) load, for a specified dwell time, and the resulting indentation is measured using a microscope. The geometry of this indenter is an extended pyramid with the length to width ratio being 7:1 and respective face angles are 172 degrees for the long edge and 130 degrees for the short edge. The depth of the indentation can be approximated as 1/30 of the long dimension.〔("Microhardness Test", Surface Engineering Forum )〕 The Knoop hardness ''HK'' or ''KHN'' is then given by the formula:
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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