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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Knoop hardness test ： ウィキペディア英語版 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: :$HK==$ == See also == * Vickers hardness test * Knoop hardness of ceramics * Leeb Rebound Hardness Test * Meyer hardness test 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Knoop hardness test」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.