How to get material tangential stiffness of hyperelastic model?

04 April 2016 0 4K Report

The attachment file "4.6.2 Fitting of hyperelastic and hyperfoam constants.pdf" is a manual of abaqus. There are three equations in the file (see the png file). I don know how to obtained these equaitons? could anyone tell me how to derive them?

Thank you.

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