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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 Deep hole drilling ： ウィキペディア英語版 Deep hole drilling Deep hole drilling (DHD) is a residual stress measurement technique used to measure locked-in and applied stresses in engineering materials and components.〔H.Hitano et al. ''A study for high accuracy measurement of residual stress by deep hole drilling technique'' Journal of Physics: Conference Series 379, 2012 ()〕 DHD is a semi-destructive mechanical strain relaxation (MSR) technique, which seeks to measure the distribution of stresses along the axis of a drilled reference hole. The process is unique in its ability to measure residual stresses at a microscopic level with a penetration of over , without total destruction of the original component. DHD is considered ''deep'' in comparison to other hole drilling techniques such as centre hole drilling.〔VEQTER Ltd - Centre Hole Drilling (). Retrieved on 25 February 2014〕 == Technique Overview == DHD involves drilling a hole through the thickness of the component, measuring the diameter of the hole, trepanning (cutting a circular slot around the hole) a core of material from around the hole and finally re-measuring the diameter of the hole.〔A.H. Mahmoudi et al. ''A New Procedure to Measure Near Yield Residual Stresses Using the Deep Hole Drilling Technique'' Experimental Mechanics, 2009 ()〕 For engineering metals, the trepanning process is typically performed using electrical discharge machining (EDM) to minimise the introduction of further stresses during the cutting. The differences between the measured diameters before and after stress release enables the original residual stresses to be calculated using elasticity theory. An animated YouTube video explaining the DHD technique can be viewed here: (YouTube: Deep Hole Drilling Technique ). 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「Deep hole drilling」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.