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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 Three point flexural test ： ウィキペディア英語版 Three point flexural test The three point bending flexural test provides values for the modulus of elasticity in bending $E\_f$, flexural stress $\backslash sigma\_f$, flexural strain $\backslash epsilon\_f$ and the flexural stress-strain response of the material. The main advantage of a three point flexural test is the ease of the specimen preparation and testing. However, this method has also some disadvantages: the results of the testing method are sensitive to specimen and loading geometry and strain rate. == Testing method == The test method for conducting the test usually involves a specified test fixture on a universal testing machine. Details of the test preparation, conditioning, and conduct affect the test results. The sample is placed on two supporting pins a set distance apart and a third loading pin is lowered from above at a constant rate until sample failure. Calculation of the flexural stress $\backslash sigma\_f$ :$\backslash sigma\_f\; =\; \backslash frac$ for a rectangular cross section :$\backslash sigma\_f\; =\; \backslash frac$ for a circular cross section Calculation of the flexural strain $\backslash epsilon\_f$ :$\backslash epsilon\_f\; =\; \backslash frac$ Calculation of flexural modulus $E\_f$ :$E\_f\; =\; \backslash frac$ in these formulas the following parameters are used: * $\backslash sigma\_f$ = Stress in outer fibers at midpoint, (MPa) * $\backslash epsilon\_f$ = Strain in the outer surface, (mm/mm) * $E\_f$ = flexural Modulus of elasticity,(MPa) * $F$ = load at a given point on the load deflection curve, (N) * $L$ = Support span, (mm) * $b$ = Width of test beam, (mm) * $d$ = Depth of tested beam, (mm) * $D$ = maximum deflection of the center of the beam, (mm) * $m$ = The gradient (i.e., slope) of the initial straight-line portion of the load deflection curve,(P/D), (N/mm) * $R$ = The radius of the beam, (mm) 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「Three point flexural 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.