Displ_max 5[mm] Maximum hook displacement E_hook 1e10[Pa] Young's modulus, hook nu_hook 0.35 Poisson's number, hook S_yield_hook 1.2e8[Pa] Yield stress, hook E_hard_hook 1.2e9[Pa] Isotropic tangent modulus, hook rho_hook 7850[kg/m^3] Density, hook para 0 Parameterization of the hook displacement