拉伸试验数据处理步骤

1、1将原始数据（位移-载荷）转化成真实应力-应变。计算公式分别如图框所示，其中“30”为该次试验试样标距，A列为拉伸载荷，B为拉伸位移，图2中框内的“577.395”为该试样“标距*初始厚度*初始宽度”的值。珈插入麵布局iSSUN赛V氏=ln(3(ABcD1StandardStandardstrainstress23.960150c0.00E+00=ln(30+B2)/30)33.S75873e0.00E+0043.978548c1.36E-0553.971936cmum1Figure1计算真应变v41.xlsx-Micrcsottbxcel昭插入兵回布局数捋审阅视图SUN-X=(30+B2)A

2、2/577.395ABCDELStandardforce.Standardtravestrainstress2农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计算真应力2求比例段斜率，即弹性模量。2.1在origin中新建book，将strain和stress列的数据拷入book。回BfV)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删除断裂后的数据2.3选择比例段数据。如图，选取所示点（该点的选择可以稍微小一点）之前为比例段。在book中将该段数据绘图。Figure3数据导入origin2.2绘图。在图中选取断裂点，读取该点所在行号如B16902,在boo

4、k中删除断裂后的点。Figure5选取比例段DataDis-play二J凶Boolc1_B5373：X=0.0159792786.Y=273.7431362.4线性拟合，得到斜率17327.9.ataMathematicsDataManipulation3F-&4書寓钻瑁eFittingFitLinear1SignalProcessingFitPolynomialOpenDialog.SpectroscopyNoinilinearCurveFitAn自1丫虽|ToolsFormatWindowHelpNonlinearCurveFit.FitLinear:FitPolynomial.FitLi

5、near.NonlinearCurveFit:NonlinearSurfaceFit.SimulateCurve.FitSinglePeak.FitMulti-peaks.260-240-220-200-180-160-140-Q120-60-40-20FitExponef门ti自LFitSigmoidal.CompareDatasets.CompareModels.Figure6线性拟合E-quationy=a+A-dj.R-Square0.9982VaiueStandardErrorDInterceptS.3886S0備72DSlope17327.-905267.77573Figure7拟

6、合得到斜率3求交点。绘出以（0.002,0）为起始点，与比例段拟合直线平行的直线。读取直线与真应变-应力曲线的交点（要求两个纵轴scale相同）。A(X1)B(Y1)CCX2)2)igNamestrainstressUnitsjmments102.061760.0020202.065760.102172.334.5271BE-2.067154-452716E-7Figure8插入曲线0.000.050.10Figure9读取交点4拟合塑性变形段。4.1在book中保留交点之后的数据。对应变列进行运算，整体减去第一个应变量（弹性应变部分的值），具体操作为：选中应变列，右键，setcolumnva

7、lues，输入col（A）-首个应变值（如0.02118）（英文输入法）。Figure10应变列首值归零4.2拟合真塑性应力应变曲线。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匚门皿狂FaraiTiMpaniri产FiWPlIVaIupErrorIlepemierLCjaoffsetVl.j331.T1214bcoetficientH766.03069c匚ii丁iYB0.54214Figure13勾选offset，固定拟合曲线起点Equationy=a+b*x*cAdj.R-Sq0.998