Determine parameters using MATLAB
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I want to determine some parameters that compound my equation. I know a little bit about optimization toolbox.
This my code:
G=26.9;
sigma=25;
u=0.4;
sigmam=9.333;
sigma_star=sigma*((2/3)*(1+u+3*(1-2*u)*((sigmam/sigma)^2)))^0.5;
D=1-(1-(r+1)*((sigma_star/B)^r)*t)^(1/(r+1));
et=(sigma/c1)*(1-exp(-G*t/c2));
es = a1*(sigma^n)*t;
ed = a2*((sigma/B*(1-D))^n)*t;
e=et+es+ed;
I have the values of t (time) and e(total deformation) from an experimental test and need to determine a1,a2,c1,c2, B, n and r parameters.
Can anyone give some help in terms of procedure to be adopted to estimate those parameters using MATLAB ?
Thanks.
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