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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 Goodman relation ： ウィキペディア英語版 Goodman relation In materials science and fatigue, the Goodman relation is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material. A Goodman diagram,〔 Herbert J. Sutherland and John F. Mandell. ("Optimized Goodman diagram for the analysis of fiberglass composites used in wind turbine blades" ). 〕〔 David Roylance. ("Fatigue" ). 2001. 〕 sometimes called a Haigh diagram〔 ("Fatigue Theory > Total Life (S-N) Analysis" ) 〕 or a Haigh-Soderberg diagram,〔 Tapany Udomphol. ("Fatigue of metals" ). 2007. 〕 is a graph of (linear) mean stress vs. (linear) alternating stress, showing when the material fails at some given number of cycles. A scatterplot of experimental data shown on such a plot can often be approximated by a parabola known as the Gerber line, which can in turn be (conservatively) approximated by a straight line called the Goodman line. 〔〔 ("Fatigue" ) Figure 3.9 〕 ==Mathematical description== The Goodman relation can be represented mathematically as: :$\backslash sigma\_\backslash text\; =\; \backslash sigma\_\backslash text\backslash times\backslash left(1-\backslash frac\}\backslash right).$ Where $\backslash sigma\_\backslash text$ is the alternating stress, $\backslash sigma\_\backslash text$ is the mean stress, $\backslash sigma\_\backslash text$ is the fatigue limit for completely reversed loading, and $\backslash sigma\_\backslash text$ is the ultimate tensile strength of the material. The general trend given by the Goodman relation is one of decreasing fatigue life with increasing mean stress for a given level of alternating stress. The relation can be plotted to determine the safe cyclic loading of a part; if the coordinate given by the mean stress and the alternating stress lies under the curve given by the relation, then the part will survive. If the coordinate is above the curve, then the part will fail for the given stress parameters.〔Hertzberg, p. 530-31.〕 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「Goodman relation」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.