Fe Snake Script Apr 2026

def _mass_matrix(self): M = lil_matrix((self.ndof, self.ndof)) # Assemble consistent mass matrix return M.tocsc()

def _local_stiffness(self): k = np.zeros((6,6)) # Standard beam stiffness matrix (axial, bending) # ... (implementation omitted for brevity) return k FE Snake Script

def nonlinear_force(self, u_e, x0_e): # Compute local deformations, then rotate to global # Returns internal force vector (6,) and tangent stiffness (6,6) pass class SnakeFEModel: def (self, n_elements, length, E, rho, radius=0.005): self.n_elements = n_elements self.n_nodes = n_elements + 1 self.ndof = 3 * self.n_nodes self.E = E self.rho = rho A = np.pi * radius 2 I = np.pi * radius 4 / 4 self.beam = CorotationalBeam(E, A, I, length) self.M = self._mass_matrix() def _mass_matrix(self): M = lil_matrix((self