How to fit the Neo Hookean model i.e., stress = 2*c1.*((strain)^2 - 1/strain) to a given stress and strain data and to estimate the parameter c1.

the fitting needs to be done for all the 9 series of the static dataset in the excel file.

Answer 1

[sai charan sampara]

Hello Shekar,

I understand that you are trying to fit available data into an equation of required form.

You can use the Curve Fitter App in MATLAB. There is an option to change the fit options to “Custom Equation”. In that the required equation can be entered. Here “y” can be stress and “x” can be strain and “c1” is the perimeter and the equation can be 2*c1*((x^2-1/x). The data can be then inputted for stress and strain and "c1" can be estimated to get closest possible fit.

You can refer to the below documentation to learn more about Curve Fitter App:

• https://www.mathworks.com/help/curvefit/curvefitter-app.html