i want to iterate for each crack size from 25 to 250mpa with 25 increments

Question

Hasan 2024-12-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2172378-i-want-to-iterate-for-each-crack-size-from-25-to-250mpa-with-25-increments

评论： Hasan 2024-12-21

I want to iterate for every load from 25 to 250 mpa with 25 increments but i didn't take conclusion. here my code and please help me;

clc
clear all
close all hidden
W = 0.4;
Sy = 250;
ea = 0.001;
Es = 0;
i=1;
fprintf('%10s      %10s       %10s\n','Load','K1eff Irwins app.','At iteration no');
for S = 25
    S = S+25;
    while abs(Es)<ea
        i=i+1;
        aold = 0.0254;
        x1 = aold/W;
        bold = 1+0.256.*x1-1.152.*x1.^2+12.2.*x1.^3;
        kold = bold.*S.*(pi.*aold).^1/2;
        rp = (1/(2.*pi)).*(kold./Sy).^(2);
        anew = aold + rp;
        x2 = anew./W;
        bnew = 1+0.256.*x2-1.152.*x2.^2+12.2.*x2.^3;
        knew = bnew.*S.*(pi.*anew).^(1/2);
        Es = abs((knew-kold)./knew).*100;
        if Es >= 0.0001
            anew = aold;
        end
    fprintf('%10.4f      %10.4f           [%10.4f]\n', S, knew, i)
    end
if S==250
    break
end
end

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Answer 1

Walter Roberson 2024-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/2172378-i-want-to-iterate-for-each-crack-size-from-25-to-250mpa-with-25-increments#answer_1556200

for S = 25 : 25 : 250

and get rid of the S=S+25 and the test for S==250

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Walter Roberson 2024-12-21

在 MATLAB Online 中打开

while abs(Es)<ea

Nothing in your for loop changes Es or ea. Once abs(Es)<ea becomes false, nothing resets Es or ea, so the test will continue to be false on the next iteration (and the iteration after that...)

You probably need to move the

Es = 0;

inside the for loop.

Hasan 2024-12-21

Ohh! it is working. Thank you Walter for your attention. :)

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i want to iterate for each crack size from 25 to 250mpa with 25 increments

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i want to iterate for each crack size from 25 to 250mpa with 25 increments

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