Consider the three nonlinear springs in the figure. The stiffness of each spring is given by k1 = 500 + 50u, k2 = 200 + 100u, and k3 = 500 + 100u, where u is the elongation of the spring.
Solve the displacements at nodes 1 and 2 using the Newton-Raphson method when F = 100.
