e/Knoop hardness test

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has glosseng: The Knoop hardness test (pronounced kuh-nūp) 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 force, 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. The Knoop hardness HK or KHN is then given by the formula:
lexicalizationeng: Knoop hardness test
instance ofe/de/Einheit
Meaning
French
has glossfra: L'échelle de dureté de Knoop est après celle de Brinell la plus fréquemment appliquée.
lexicalizationfra: Dureté Knoop
Italian
has glossita: La scala di Knoop è un sistema di misurazione della durezza dei materiali, impiegato specialmente per materiali molto duri e fragili, per es. ceramica e vetro.
lexicalizationita: scala di Knoop
Japanese
has glossjpn: ヌープ硬度(Knoop hardness)とは工業材料の硬さを表す尺度の一つであり、押込み硬さの一種である。
lexicalizationjpn: ヌープ硬度
Portuguese
has glosspor: O método Knoop é utilizado para a medição de micro-dureza, na qual um penetrador de diamante, com formato piramidal, é pressionado contra uma superfície devidamente polida.
lexicalizationpor: Dureza Knoop
Swedish
has glossswe: | align="right" frame="box" |+ Exempel på Knoop-hårdheter |----- ! Prov ! HK |----- | Guldfolie || align="center" | 60 |----- | Kvarts || align="center" | 820 |----- | Kiselkarbid || align="center" | 2 480 |----- | Borkarbid || align="center" | 3 000 |----- | Diamant || align="center" | 8 000 |----- |} Knoop-provning är en metod för hårdhetsmätning på nästan vilka plastiska material som helst. Metoden togs fram 1939 av F. Knoop vid dåvarande National Bureau of Standards (NBS, numera NIST, National Institute of Standards and Technology) i USA. Principen påminner om Vickersprovning, men arbetar med en osymmetrisk mätspets. Denna utgörs av en fyrsidig pyramid med rombisk bas, där den längre diagonalen är 7 gånger så lång som den kortare, och toppvinklarna mellan motstående sidor i pyramidens spets är 172,5° resp 130°.
lexicalizationswe: Knoop-provning

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