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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 Berkovich tip ： ウィキペディア英語版 Berkovich tip A Berkovich tip is a type of nanoindenter tip used for testing the indentation hardness of a material. It is a three-sided pyramid which is geometrically self-similar. It has a very flat profile, with a total included angle of 142.3 degrees and a half angle of 65.35 degrees, measured from the axis to one of the pyramid flats. The Berkovich tip has the same projected area-to-depth ratio as a Vickers indenter. The tip shape was invented by Russian scientist E.S. Berkovich in the USSR c. 1950.〔E.S. Berkovich, "Three-Faceted Diamond Pyramid for Studying Microhardness by Indentation," ''Zavodskaya Laboratoria'', Vol. 13 #3, 1950, p 345-347 (in Russian).〕〔M.M. Khrushchov & E.S. Berkovich, "Methods of Determining the Hardness of Very Hard Materials: The Hardness of Diamond," ''Industrial Diamond Review'', Vol. 11, Feb 1951, p 42-49 (in English).〕 As it is three sided, it is easier to grind these tips to a sharp point and so is more readily employed for nanoindentation tests. It is typically used to measure bulk materials and films greater than thick. == References == 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「Berkovich tip」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.