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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 Dynamic modulus ： ウィキペディア英語版 Dynamic modulus Dynamic modulus is the ratio of stress to strain under ''vibratory conditions'' (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelastic materials. == Viscoelastic stress–strain phase-lag == Viscoelasticity is studied using dynamic mechanical analysis where an oscillatory force (stress) is applied to a material and the resulting displacement (strain) is measured.〔(PerkinElmer "Mechanical Properties of Films and Coatings" )〕 *In purely elastic materials the stress and strain occur in phase, so that the response of one occurs simultaneously with the other. *In purely viscous materials, there is a phase difference between stress and strain, where strain lags stress by a 90 degree ($\backslash pi/2$ radian) phase lag. *Viscoelastic materials exhibit behavior somewhere in between that of purely viscous and purely elastic materials, exhibiting some phase lag in strain.〔Meyers and Chawla (1999): "Mechanical Behavior of Materials," 98-103.〕 Stress and strain in a viscoelastic material can be represented using the following expressions: *Strain: $\backslash varepsilon\; =\; \backslash varepsilon\_0\; \backslash sin(\backslash omega\; t)$ *Stress: $\backslash sigma\; =\; \backslash sigma\_0\; \backslash sin(\backslash omega\; t+\; \backslash delta)\; \backslash ,$ 〔 where :$\backslash omega\; =2\; \backslash pi\; f$ where $f$ is frequency of strain oscillation, :$t$ is time, :$\backslash delta$ is phase lag between stress and strain. 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「Dynamic modulus」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.