Stress and deflection Equation Not Working Out

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Daniel Millard
Daniel Millard 2021-11-2
评论： Jon 2021-11-2
I hvae to write a code to calculate stress and deflection along the beam at intervals of 10cm, i hvae tried the equation multiple ways and its not working could someone please show me where i'm going wrong.
Values-
E is the modulus of elasticity and I is the moment of inertia.
Assume that the cantilever beam is 2 metres long with a 2,000N load located 1 metre from the end.
The beam has:
Section modulus (Z) of 1.5x105mm3 Moment of inertia (I) of 44.6 x l06 mm4 and Modulus of elasticity (E) of 2 x l05 N/mm2 .
E = 2*10^5;
P = 2000;
I = 44.6*10^6;
l = 2;
a = (0:0.1:l);
b = (l-a);
for n = 1:length(a)
s(1:4,n) =(P*a(n)*b(n).*c)./(I*l);
end
%plot(a,s)
for x = 1:length(a)/2
for d = 1:4
d = ((P.*b(x).*x)./(6*l*E*I)).*(l.^2-x.^2-b(x).^2);
end
end
for x = length(a)-1
for d2 = 1:4
for mi = I(1:4)
d2 = -(((P*b)./(6*l*E*mi)).*((l./b).*(x-a).^3)+(l^2-b.^2).*(x-x^3));
end
figure
plot(d2)
end
end

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回答（1 个）

Jon
Jon 2021-11-2
You may have other issues, but to start with you have to assign the value of the variable c before you use it at line 8
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Jon
Jon 2021-11-2
However you want to find a value for c, you need to assign it before you can use it on the right hand side of an expression.
So you need to have a line such as:
c = 2
before you get to
s(1:4,n) =(P*a(n)*b(n).*c)./(I*l);
Jon
Jon 2021-11-2
Also, your line of code
for mi = I(1:4)
does not make sense, as you only have assigned one value to I (I = 44.6*10^6;). So it doesn't make sense to loop through 4 values of I when there is only one value for it

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