Dear Researchers,

I am trying to model transversely isotropic growth using the tangent moduli A(=dP/dF). My calculations file for A is attached. I used Newton-Raphson iteration. but, the convergence rate is not quadratic. Are there mistakes in it?

Is there a relation between the Lagrangian tangent moduli L(=2*dS/dC) and A(=dP/dF)?

Thanks,

Saeed