1、1將原始數(shù)據(jù)（位移-載荷）轉(zhuǎn)化成真實(shí)應(yīng)力-應(yīng)變。計(jì)算公式分別如圖框所示，其中“30”為該次試驗(yàn)試樣標(biāo)距，A列為拉伸載荷，B為拉伸位移，圖2中框內(nèi)的“577.395”為該試樣“標(biāo)距*初始厚度*初始寬度”的值。珈插入麵布局iSSUN賽V氏=ln(3(ABcD1StandardStandardstrainstress23.960150c0.00E+00=ln(30+B2)/30)33.S75873e0.00E+0043.978548c1.36E-0553.971936cmum1Figure1計(jì)算真應(yīng)變v41.xlsx-Micrcsottbxcel昭插入兵回布局?jǐn)?shù)捋審閱視圖SUN-X=(30+B2)A

2、2/577.395ABCDELStandardforce.Standardtravestrainstress2農(nóng)9681586+001;,:0.OOE+OO：q=(30+2)2/577.39533.975873e+001;0.OOE+OO03.978548e+001;1.36E-054.SSTISE-OT3.971936e+001;-1.36E-05-4.5271SE-073.973038e+001;-1.36E-05-4.5271&E-071Figure2計(jì)算真應(yīng)力2求比例段斜率，即彈性模量。2.1在origin中新建book，將strain和stress列的數(shù)據(jù)拷入book?；谺fV)ri

3、Long忖amestrainstressUnitsComments102.06176202.065762452716E-2.067154-4.52716E2.0637254527北E2.064296-4.52716E2.064737-4.52716E2.06674_lSheetl/|*Lrri卜700-I&00-500-400-300-200-100-0-Figure4刪除斷裂后的數(shù)據(jù)2.3選擇比例段數(shù)據(jù)。如圖，選取所示點(diǎn)（該點(diǎn)的選擇可以稍微小一點(diǎn)）之前為比例段。在book中將該段數(shù)據(jù)繪圖。Figure3數(shù)據(jù)導(dǎo)入origin2.2繪圖。在圖中選取斷裂點(diǎn)，讀取該點(diǎn)所在行號(hào)如B16902,在boo

4、k中刪除斷裂后的點(diǎn)。Figure5選取比例段DataDis-play二J兇Boolc1_B5373：X=0.0159792786.Y=273.7431362.4線性擬合，得到斜率17327.9.ataMathematicsDataManipulation3F-&4書(shū)寓鉆瑁eFittingFitLinear1SignalProcessingFitPolynomialOpenDialog.SpectroscopyNoinilinearCurveFitAn自1丫雖|ToolsFormatWindowHelpNonlinearCurveFit.FitLinear:FitPolynomial.FitLi

5、near.NonlinearCurveFit:NonlinearSurfaceFit.SimulateCurve.FitSinglePeak.FitMulti-peaks.260-240-220-200-180-160-140-Q120-60-40-20FitExponef門(mén)ti自LFitSigmoidal.CompareDatasets.CompareModels.Figure6線性擬合E-quationy=a+A-dj.R-Square0.9982VaiueStandardErrorDInterceptS.3886S0備72DSlope17327.-905267.77573Figure7擬

6、合得到斜率3求交點(diǎn)。繪出以（0.002,0）為起始點(diǎn)，與比例段擬合直線平行的直線。讀取直線與真應(yīng)變-應(yīng)力曲線的交點(diǎn)（要求兩個(gè)縱軸scale相同）。A(X1)B(Y1)CCX2)2)igNamestrainstressUnitsjmments102.061760.0020202.065760.102172.334.5271BE-2.067154-452716E-7Figure8插入曲線0.000.050.10Figure9讀取交點(diǎn)4擬合塑性變形段。4.1在book中保留交點(diǎn)之后的數(shù)據(jù)。對(duì)應(yīng)變列進(jìn)行運(yùn)算，整體減去第一個(gè)應(yīng)變量（彈性應(yīng)變部分的值），具體操作為：選中應(yīng)變列，右鍵，setcolumnva

7、lues，輸入col（A）-首個(gè)應(yīng)變值（如0.02118）（英文輸入法）。Figure10應(yīng)變列首值歸零4.2擬合真塑性應(yīng)力應(yīng)變曲線。1u0se2MathernaticsDataManipulationi-二tfitLinearFtPolynomial1IMonlFniBarCurveFitOpmDialo-g.Ctrl-kV9NonlinearSurfaceFit.wComparePatasete.Co-mpait巳Models.SignalProcessingSpectroscopy600AtSigmoidal.dnn-Annstia|AnalysisToolsFormatWindowHe

8、lp2NonlinearCurveFt.3FitPolynomial.4FitLineair.5NonlinearCurveKt:tused-SimuateCurve.FitsinglePeak.,fitMulti-peaks.fitExponentisl.,1fitLinear:ingsCodn：P：ii-:iifieters匚門(mén)皿狂FaraiTiMpaniri產(chǎn)FiWPlIVaIupErrorIlepemierLCjaoffsetVl.j331.T1214bcoetficientH766.03069c匚ii丁iYB0.54214Figure13勾選offset，固定擬合曲線起點(diǎn)Equationy=a+b*x*cAdj.R-Sq0.998