How to find yield point and plot strain hardening part?

39 views (last 30 days)
M = readtable('highstrain.csv');
test = table2array(M)
strain = test(:,1);
stress = test(:,2);
p=plot(strain,stress,'ko-',"LineWidth", 2)
xlabel('\epsilon')
ylabel('\sigma (MPa)')
xlim([0 0.5]);
ylim([0 700]);
ultimate_strength = max(stress);
elongation = max(strain);
I have true_stress vs strain curve ploted in MATLAB. I want to find yeild stress from this curve and plot just strain hardening part (e.g, from yield point stress to ultimate stress). Please let me know what I should do and which code and function I should use, since I am quit new to MATLAB.

Accepted Answer

KSSV
KSSV on 18 Oct 2021
file = 'https://in.mathworks.com/matlabcentral/answers/uploaded_files/770221/highstrain.csv' ;
T = readtable(file) ;
x = T.X ; y = T.Y ;
% Ultimate strength
[val,idx] = max(y) ;
xmax = x(idx) ; ymax = val ;
% Get linear part
threshold = 550;
[TF,Sl,Ic] = ischange(y, 'linear','Threshold',threshold);
idx = find(TF);
xlinear = x(1:idx(2)) ;
ylinear = y(1:idx(2)) ;
figure
hold on
plot(x,y,'r')
plot(xmax,ymax,'*r')
plot(xlinear,ylinear,'*-b')

More Answers (0)

Categories

Find more on Stress and Strain in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!