code no good :(

Question

Hussein Altameemi il 26 Set 2022

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https://it.mathworks.com/matlabcentral/answers/1812390-code-no-good

Modificato: Jan il 26 Set 2022

DP980TD-S2.xlsx

im getting :

Error in draft1 (line 45)

areaReduction(i) = areaOriginal-(E1(i)*E2(i)); % Make Plot for Report notate initiation of necking

clc,clear all 
%% Load Data - Initilize Variables 
DP980TD_S2 = xlsread('DP980TD-S2.xlsx'); % Data File 
% Constants 
widthOriginal = DP980TD_S2(1,2); % Original gauge width (mm) 
thicknessOriginal = DP980TD_S2(2,2); % Original gauge thickness (mm) 
lengthOriginal = DP980TD_S2(3,2); % Original gauge length (mm) 
widthFinal = DP980TD_S2(4,2); % Final gauge width at fracture (mm) 
thicknessFinal = DP980TD_S2(5,2); %final gauge thickness at fracture (mm) 
% Arrays 
force = DP980TD_S2([14:end],1).'; 
disp = DP980TD_S2([14:end],2).'; 
E1 = DP980TD_S2([14:end],3).'; 
E2 = DP980TD_S2([14:end],4).'; 
% Area 
areaOriginal = area(widthOriginal,thicknessOriginal); 
areaNeck = area(widthFinal,thicknessFinal); 
%####################################################################### 
%% Area of Reduction 
areaInstant = []; 
for i = 1:length(E1) 
    areaReduction(i) = areaOriginal-(E1(i)*E2(i)); % Make Plot for Report notate initiation of necking 
    areaInstant(i) = areaOriginal*exp(-E1(i)); 
end 
%##################################################################### 
%% Onset of necking Calculation: Stress and Strain at UTS; Uniform Elongation 
uniformElongation = 0;% percent 
UTSIndex = 0; 
strainUTS = 0; 
for i = 1:length(force) 
    if force(i) == max(force) % index UTS 
        uniformElongation = (disp(i) / lengthOriginal) * 100; % (mm) 
        strainUTS = E1(i); 
        UTSIndex = i; 
    end 
end 
%######################################################################## 
%% total elongation at failure 
totalElongation = (disp(end) / lengthOriginal) * 100; % (mm) 
%######################################################################## 
%% At fracture Sigma Ultimate Tensile Strength ; TrueUTS ; true Strain  
sigmaUTS = max(force); 
%Incorrect 
sigmaUTSTrue = trueUTS(sigmaUTS,areaOriginal,areaInstant(UTSIndex));  
strainUTSTrue = trueStrain((lengthOriginal + disp(end)),lengthOriginal,0,0,0,0); 
%########################################################################## 
%% Engineering and True Strain and Stress Arrays 
EngStress = []; 
EngStrain = []; 
stressTrue = []; 
strainTrue = []; 
for i = 1:length(force)  
    EngStress(i) = engineeringStress(force(i),areaOriginal); 
    EngStrain(i) = engineeringStrain(lengthOriginal+disp(i),lengthOriginal); 
    strainTrue(i) = trueStrain(lengthOriginal+disp(i),lengthOriginal); 
    stressTrue(i) = trueStress(force(i),areaInstant(i));  
end 
% Engineering Stress and Strain at UTS 
EngStressUTS = max(EngStress); % MPa 
StrainUTS = 0; 
% Uniform Elongation At Eng. Stress UTS 
for i = 1:length(EngStress) 
    if EngStress(i) == max(EngStress) % index UTS 
        uniformElongationEngStress = (disp(i) / lengthOriginal) * 100; % (mm) 
        StrainUTS = EngStrain(i); % MPa 
    end 
end 
%% Strength Coefficient K @ UTS 
%power law equtaion at UTS of True Stress 
K = strenghtCoefficient(stressTrue(UTSIndex),strainTrue(UTSIndex));  
% Strength Coefficient from DIC data and Engeering data for plot B 
kDIC = strenghtCoefficient(stressTrue(UTSIndex),strainTrue(UTSIndex)); %May not need this 
kEng = strenghtCoefficient(max(EngStress),EngStrain(UTSIndex)); 
%###################################################################### 
%% Strain Hardening-Exponent @ UTS n = e 
% length at onset of necking (UTS) 
lengthTrueUTS = (lengthOriginal+disp(UTSIndex)); % total length atpoint of UTS of True Stress 
lengthEngUTS = (lengthOriginal+disp(UTSIndex)); % total length atpoint of UTS of Eng Stress 
n = trueStrain(lengthTrueUTS,lengthOriginal,0,0,0,0); % n = e = ln(l/lo) 
nDIC = n; % At uts The solution for 'n' is equal for all data methoods (True, Eng, DIC) 
%######################################################################## 
%% 2 Percent Offset curve Force and Strain 
% Initilize array 
EngStrainOffset = [1:200]; 
EngStressLinearFit = [1:200]; 
% 2 Percent Offset Slope from index of [1:75] 
offsetSlope = (EngStress(75)-EngStress(1)) / (EngStrain(75)-EngStrain(1));  
% strain offset curve for graph 
for i = 1:length(EngStrainOffset) 
    EngStrainOffset(i) = EngStrain(i) + .002; 
    EngStressLinearFit(i) = offsetSlope*EngStrain(i); 
end 
%######################################################################3 
%% Yeild Point Stress and Strain 
% % Central Difference 
% dfdxC = TwoCdfdx(EngStress,EngStrain);  
% df2dx2C = TwoCdfdx(dfdxC,EngStrain);  
%Three Point Forward difference 
dfdxF = ThreeFdfdx(EngStress,EngStrain); 
df2dx2F = ThreeFdfdx(dfdxF,EngStrain); 
dfde = []; 
df2de2 = []; 
%% This is basically junk but it happened to work, but I do not believe it is very reliable 
sigmaY =[]; 
strainY = []; 
Tolerence = 0.01;  
sigmaYIndex = 0; 
dfdxY = 0; 
for i  = 1:200     
    if (EngStressLinearFit(i) >= EngStress(i)+Tolerence)  
        sigmaY =  EngStress(i); 
        strainY = EngStrain(i); 
        dfdxY = dfdxF(i); 
        sigmaYIndex = i; 
        break 
    end 
end 
%% Modulus of Elasticity at yeild point 
modElasticity = EngStress(sigmaYIndex)/EngStrain(sigmaYIndex); 
%######################################################################## 
%% Posson's Ratio in Elastic Range 
poissonsRatio = []; 
poissonsRatio(1) = 0; 
for i = 2:sigmaYIndex 
    elastRange(i) = abs(E2(i) / E1(i));     
end 
elastRangeAvg = mean(elastRange); 
poissonsRatio([1:sigmaYIndex]) = elastRangeAvg; 
for  i = 116:1565%(sigmaYIndex + 1):length(E2(sigmaYIndex:E2(end))) 
    poissonsRatio(i) = E2(i) / E1(i); 
end 
%######################################################################## 
%% Toughness 
u = toughness(K,strainTrue(end),n); % NEED WORK STILL 
%####################################################################### 
%% Plots 
%% Engineering Stress-Strain curve and True Stress - True Strain Curve 
figure("Name","Graph A") 
plot(strainTrue,stressTrue,'r.',EngStrain,EngStress,'b.'); xlabel('Total Strain \epsilon'); ylabel('Stress \sigma'); 
title('DP1180RD S1');xlim([-0.01,0.15]);ylim([0,1.9]); 
hold on 
plot(EngStrain(end),EngStress(end),'rX');  
text(0.075,0.8,['( ',num2str(EngStrain(end)),' , ',num2str(EngStress(end)),' )'],'FontSize',9,'Color','black'); 
text(0.08,0.87,'Fracture Point','FontSize',9,'Color','red'); hold on; 
plot(StrainUTS,EngStressUTS,'r*');  
text(0.058,1.15,'UTS','FontSize',9,'Color','red'); 
text(0.048,1.09,['( ',num2str(StrainUTS),' , ',num2str(EngStressUTS),' )'],'FontSize',9,'Color','black'); 
text(0.04,0.5,['Uniform Elongation @ UTS: ',num2str(uniformElongation),' mm'],'FontSize',9,'Color','black'); 
text(0.04,0.4,['Total Elongation @ Fracture Point: ',num2str(totalElongation),' mm'],'FontSize',9,'Color','black'); 
legend("True Strain","Eng. Strain",'Location',"southeast");  
hold off; 
%########################################################################### 
%% Power-Law Equation Curve fitting 
figure("Name","Graph B") 
plot(EngStrain([sigmaYIndex:UTSIndex]),EngStress([sigmaYIndex:UTSIndex]),'k.'); hold on 
plot(strainTrue([sigmaYIndex:UTSIndex]),stressTrue([sigmaYIndex:UTSIndex]),'bo'); hold on 
%plot(EngStrain,EngStrain([]).*slopeCurveFit'Fitted-EngSS') hold on 
plot(strainTrue([sigmaYIndex:end]),stressTrue([sigmaYIndex:end]),'r.'); hold on 
%plot('Fitted-DIC') hold on 
text(0.03,1.25,['\sigma','=K(\it\epsilon_{o}+\epsilon)^{n}'],'FontSize',9,'Color','black'); 
text(0.04,0.6,['K, n, \it\epsilon_{o} :'],'FontSize',9,'Color','black'); 
text(0.04,0.5,['DIC: ',num2str(kDIC),' , ',num2str(n),' , ',num2str(strainTrue([1]))],'FontSize',9,'Color','black'); 
text(0.04,0.4,['Eng: ',num2str(kEng),' , ',num2str(n),' , ',num2str(EngStrain([1]))],'FontSize',9,'Color','black'); 
title('DP1180RD S1 - Plastic');xlim([0,0.15]);ylim([0,1.9]); 
xlabel('Plastic Strain'); ylabel('Stress, MPa'); 
legend("EngSS",'TrueSS-Eng Data',"TrueSS-DIC Data",'Location',"southeast"); 
hold off 
%######################################################################### 
%% Engineering Stress-Strain Curve 2% Offset Yeild Point 
figure("Name","Graph C") 
plot(EngStrain,EngStress,'b.'); xlabel('Strain \epsilon'); ylabel('Stress, MPa \sigma'); hold on 
title('DP1180RD S1 - Elastic');xlabel('EngStrain \it e');ylabel('EngStress, MPa'); 
xlim([0,0.007]);ylim([0,1.2]); 
plot(strainY,sigmaY,'rO'); hold on 
% Linear Fitting 
plot(EngStrain([1:200]),EngStressLinearFit,'r-'); hold on 
% 2 Percent Offset Stress-Strain Curve 
plot(EngStrainOffset,EngStressLinearFit,'k-'); hold on 
text(.0038,0.2,['E = ',num2str(modElasticity),' (GPa)',' ; ','\it u = ',num2str(u)],'FontSize',9,'Color','black'); 
legend("Expt data",'Linear fitting','Data for fitting','0.2% offset','Location',"northwest");  
hold off; 
%  
% ######################################################################## 
%% Principle True Strain Ratio vs. E1 
figure("Name","Graph D") 
plot(E1,poissonsRatio,'b.'); xlabel('Strain \epsilon'); ylabel('Stress, MPa \sigma'); hold on 
title('DP1180RD S1 - E2/E1');xlabel('Strain E1');ylabel('E2/E1') 
%xlim([0,0.007]);ylim([0,1.2]); 
hold off 

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Answer 1

VBBV il 26 Set 2022

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https://it.mathworks.com/matlabcentral/answers/1812390-code-no-good#answer_1061035

DP980TD-S2.xlsx

clc,clear all 
%% Load Data - Initilize Variables 
DP980TD_S2 = xlsread('DP980TD-S2.xlsx'); % Data File 
% Constants 
widthOriginal = DP980TD_S2(1,2); % Original gauge width (mm) 
thicknessOriginal = DP980TD_S2(2,2); % Original gauge thickness (mm) 
lengthOriginal = DP980TD_S2(3,2); % Original gauge length (mm) 
widthFinal = DP980TD_S2(4,2); % Final gauge width at fracture (mm) 
thicknessFinal = DP980TD_S2(5,2); %final gauge thickness at fracture (mm) 
% Arrays 
force = DP980TD_S2([14:end],1).'; 
disp = DP980TD_S2([14:end],2).'; 
E1 = DP980TD_S2([14:end],3).' 
E1 = 1×1023
1.0e+00 *

    0.0000    0.0001    0.0002    0.0002    0.0002    0.0003    0.0002    0.0002    0.0002    0.0002    0.0002    0.0002    0.0002    0.0003    0.0003    0.0004    0.0004    0.0005    0.0002    0.0004    0.0003    0.0004    0.0004    0.0004    0.0003    0.0004    0.0004    0.0004    0.0004    0.0004
E2 = DP980TD_S2([14:end],4).' 
E2 = 1×1023
1.0e+00 *

         0    0.0001    0.0000    0.0001    0.0001    0.0001    0.0001    0.0000    0.0001    0.0001    0.0001    0.0001    0.0000    0.0001    0.0001    0.0003    0.0002    0.0001    0.0001    0.0000    0.0001    0.0001    0.0001    0.0001    0.0001    0.0000    0.0002    0.0001    0.0002    0.0002
% Area 
areaOriginal = (widthOriginal*thicknessOriginal) % simple area calculation 
areaOriginal = 10.4297
areaNeck = (widthFinal*thicknessFinal); 
%####################################################################### 
%% Area of Reduction 
areaInstant = []; 
for i = 1:length(E1) 
    areaReduction = areaOriginal - (E1(i)*E2(i)); % Make Plot for Report notate initiation of necking 
    areaInstant(i) = areaOriginal*exp(-E1(i)); 
end 
%##################################################################### 
%% Onset of necking Calculation: Stress and Strain at UTS; Uniform Elongation 
uniformElongation = 0;% percent 
UTSIndex = 0; 
strainUTS = 0; 
for i = 1:length(force) 
    if force(i) == max(force) % index UTS 
        uniformElongation = (disp(i) / lengthOriginal) * 100; % (mm) 
        strainUTS = E1(i); 
        UTSIndex = i; 
    end 
end 
%######################################################################## 
%% total elongation at failure 
totalElongation = (disp(end) / lengthOriginal) * 100; % (mm) 
%######################################################################## 
%% At fracture Sigma Ultimate Tensile Strength ; TrueUTS ; true Strain  
sigmaUTS = max(force); 
%Incorrect 
sigmaUTSTrue = trueUTS(sigmaUTS,areaOriginal,areaInstant(UTSIndex));  
Unrecognized function or variable 'trueUTS'.
strainUTSTrue = trueStrain((lengthOriginal + disp(end)),lengthOriginal,0,0,0,0); 
%########################################################################## 
%% Engineering and True Strain and Stress Arrays 
EngStress = []; 
EngStrain = []; 
stressTrue = []; 
strainTrue = []; 
for i = 1:length(force)  
    EngStress(i) = engineeringStress(force(i),areaOriginal); 
    EngStrain(i) = engineeringStrain(lengthOriginal+disp(i),lengthOriginal); 
    strainTrue(i) = trueStrain(lengthOriginal+disp(i),lengthOriginal); 
    stressTrue(i) = trueStress(force(i),areaInstant(i));  
end 
% Engineering Stress and Strain at UTS 
EngStressUTS = max(EngStress); % MPa 
StrainUTS = 0; 
% Uniform Elongation At Eng. Stress UTS 
for i = 1:length(EngStress) 
    if EngStress(i) == max(EngStress) % index UTS 
        uniformElongationEngStress = (disp(i) / lengthOriginal) * 100; % (mm) 
        StrainUTS = EngStrain(i); % MPa 
    end 
end 
%% Strength Coefficient K @ UTS 
%power law equtaion at UTS of True Stress 
K = strenghtCoefficient(stressTrue(UTSIndex),strainTrue(UTSIndex));  
% Strength Coefficient from DIC data and Engeering data for plot B 
kDIC = strenghtCoefficient(stressTrue(UTSIndex),strainTrue(UTSIndex)); %May not need this 
kEng = strenghtCoefficient(max(EngStress),EngStrain(UTSIndex)); 
%###################################################################### 
%% Strain Hardening-Exponent @ UTS n = e 
% length at onset of necking (UTS) 
lengthTrueUTS = (lengthOriginal+disp(UTSIndex)); % total length atpoint of UTS of True Stress 
lengthEngUTS = (lengthOriginal+disp(UTSIndex)); % total length atpoint of UTS of Eng Stress 
n = trueStrain(lengthTrueUTS,lengthOriginal,0,0,0,0); % n = e = ln(l/lo) 
nDIC = n; % At uts The solution for 'n' is equal for all data methoods (True, Eng, DIC) 
%######################################################################## 
%% 2 Percent Offset curve Force and Strain 
% Initilize array 
EngStrainOffset = [1:200]; 
EngStressLinearFit = [1:200]; 
% 2 Percent Offset Slope from index of [1:75] 
offsetSlope = (EngStress(75)-EngStress(1)) / (EngStrain(75)-EngStrain(1));  
% strain offset curve for graph 
for i = 1:length(EngStrainOffset) 
    EngStrainOffset(i) = EngStrain(i) + .002; 
    EngStressLinearFit(i) = offsetSlope*EngStrain(i); 
end 
%######################################################################3 
%% Yeild Point Stress and Strain 
% % Central Difference 
% dfdxC = TwoCdfdx(EngStress,EngStrain);  
% df2dx2C = TwoCdfdx(dfdxC,EngStrain);  
%Three Point Forward difference 
dfdxF = ThreeFdfdx(EngStress,EngStrain); 
df2dx2F = ThreeFdfdx(dfdxF,EngStrain); 
dfde = []; 
df2de2 = []; 
%% This is basically junk but it happened to work, but I do not believe it is very reliable 
sigmaY =[]; 
strainY = []; 
Tolerence = 0.01;  
sigmaYIndex = 0; 
dfdxY = 0; 
for i  = 1:200     
    if (EngStressLinearFit(i) >= EngStress(i)+Tolerence)  
        sigmaY =  EngStress(i); 
        strainY = EngStrain(i); 
        dfdxY = dfdxF(i); 
        sigmaYIndex = i; 
        break 
    end 
end 
%% Modulus of Elasticity at yeild point 
modElasticity = EngStress(sigmaYIndex)/EngStrain(sigmaYIndex); 
%######################################################################## 
%% Posson's Ratio in Elastic Range 
poissonsRatio = []; 
poissonsRatio(1) = 0; 
for i = 2:sigmaYIndex 
    elastRange(i) = abs(E2(i) / E1(i));     
end 
elastRangeAvg = mean(elastRange); 
poissonsRatio([1:sigmaYIndex]) = elastRangeAvg; 
for  i = 116:1565%(sigmaYIndex + 1):length(E2(sigmaYIndex:E2(end))) 
    poissonsRatio(i) = E2(i) / E1(i); 
end 
%######################################################################## 
%% Toughness 
u = toughness(K,strainTrue(end),n); % NEED WORK STILL 
%####################################################################### 
%% Plots 
%% Engineering Stress-Strain curve and True Stress - True Strain Curve 
figure("Name","Graph A") 
plot(strainTrue,stressTrue,'r.',EngStrain,EngStress,'b.'); xlabel('Total Strain \epsilon'); ylabel('Stress \sigma'); 
title('DP1180RD S1');xlim([-0.01,0.15]);ylim([0,1.9]); 
hold on 
plot(EngStrain(end),EngStress(end),'rX');  
text(0.075,0.8,['( ',num2str(EngStrain(end)),' , ',num2str(EngStress(end)),' )'],'FontSize',9,'Color','black'); 
text(0.08,0.87,'Fracture Point','FontSize',9,'Color','red'); hold on; 
plot(StrainUTS,EngStressUTS,'r*');  
text(0.058,1.15,'UTS','FontSize',9,'Color','red'); 
text(0.048,1.09,['( ',num2str(StrainUTS),' , ',num2str(EngStressUTS),' )'],'FontSize',9,'Color','black'); 
text(0.04,0.5,['Uniform Elongation @ UTS: ',num2str(uniformElongation),' mm'],'FontSize',9,'Color','black'); 
text(0.04,0.4,['Total Elongation @ Fracture Point: ',num2str(totalElongation),' mm'],'FontSize',9,'Color','black'); 
legend("True Strain","Eng. Strain",'Location',"southeast");  
hold off; 
%########################################################################### 
%% Power-Law Equation Curve fitting 
figure("Name","Graph B") 
plot(EngStrain([sigmaYIndex:UTSIndex]),EngStress([sigmaYIndex:UTSIndex]),'k.'); hold on 
plot(strainTrue([sigmaYIndex:UTSIndex]),stressTrue([sigmaYIndex:UTSIndex]),'bo'); hold on 
%plot(EngStrain,EngStrain([]).*slopeCurveFit'Fitted-EngSS') hold on 
plot(strainTrue([sigmaYIndex:end]),stressTrue([sigmaYIndex:end]),'r.'); hold on 
%plot('Fitted-DIC') hold on 
text(0.03,1.25,['\sigma','=K(\it\epsilon_{o}+\epsilon)^{n}'],'FontSize',9,'Color','black'); 
text(0.04,0.6,['K, n, \it\epsilon_{o} :'],'FontSize',9,'Color','black'); 
text(0.04,0.5,['DIC: ',num2str(kDIC),' , ',num2str(n),' , ',num2str(strainTrue([1]))],'FontSize',9,'Color','black'); 
text(0.04,0.4,['Eng: ',num2str(kEng),' , ',num2str(n),' , ',num2str(EngStrain([1]))],'FontSize',9,'Color','black'); 
title('DP1180RD S1 - Plastic');xlim([0,0.15]);ylim([0,1.9]); 
xlabel('Plastic Strain'); ylabel('Stress, MPa'); 
legend("EngSS",'TrueSS-Eng Data',"TrueSS-DIC Data",'Location',"southeast"); 
hold off 
%######################################################################### 
%% Engineering Stress-Strain Curve 2% Offset Yeild Point 
figure("Name","Graph C") 
plot(EngStrain,EngStress,'b.'); xlabel('Strain \epsilon'); ylabel('Stress, MPa \sigma'); hold on 
title('DP1180RD S1 - Elastic');xlabel('EngStrain \it e');ylabel('EngStress, MPa'); 
xlim([0,0.007]);ylim([0,1.2]); 
plot(strainY,sigmaY,'rO'); hold on 
% Linear Fitting 
plot(EngStrain([1:200]),EngStressLinearFit,'r-'); hold on 
% 2 Percent Offset Stress-Strain Curve 
plot(EngStrainOffset,EngStressLinearFit,'k-'); hold on 
text(.0038,0.2,['E = ',num2str(modElasticity),' (GPa)',' ; ','\it u = ',num2str(u)],'FontSize',9,'Color','black'); 
legend("Expt data",'Linear fitting','Data for fitting','0.2% offset','Location',"northwest");  
hold off; 
%  
% ######################################################################## 
%% Principle True Strain Ratio vs. E1 
figure("Name","Graph D") 
plot(E1,poissonsRatio,'b.'); xlabel('Strain \epsilon'); ylabel('Stress, MPa \sigma'); hold on 
title('DP1180RD S1 - E2/E1');xlabel('Strain E1');ylabel('E2/E1') 
%xlim([0,0.007]);ylim([0,1.2]); 
hold off 

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VBBV il 26 Set 2022

areaOriginal = (widthOriginal*thicknessOriginal) % 
areaNeck = (widthFinal*thicknessFinal); 

apply mathematical operator * for area calculation instead of area function

VBBV il 26 Set 2022

Modificato: VBBV il 26 Set 2022

Area is a 2D fill plot function and dosent return scalar value

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Answer 2

Jan il 26 Set 2022

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Link diretto a questa risposta

https://it.mathworks.com/matlabcentral/answers/1812390-code-no-good#answer_1061040

Modificato: Jan il 26 Set 2022

areaOriginal = area(widthOriginal,thicknessOriginal);

This creates a diagram and returns the handle to the graphics object.

areaReduction(i) = areaOriginal-(E1(i)*E2(i));

Here you subtract a number from the graphics handle. This is not meaningful.

The error message should clarify this already.

Some notes:

force = DP980TD_S2([14:end],1).';
% No need for brackets:
force = DP980TD_S2(14:end, 1).'; 
% a:b is a vector already

And:

for i = 1:length(force) 
    if force(i) == max(force) % index UTS 
        uniformElongation = (disp(i) / lengthOriginal) * 100; % (mm) 
        strainUTS = E1(i); 
        UTSIndex = i; 
    end 
end 

can be simplified to:

i = find(force == max(force), 1, 'last');
uniformElongation = (disp(i) / lengthOriginal) * 100; % (mm) 
strainUTS = E1(i); 
UTSIndex = i; 

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code no good :(

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code no good :(

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