Using Load Method to Determine Bifurcation Point and Branch Path Based on FEM

Abstract

Based on the basic principle of load disturbance method to implement equilibrium path transformation, this paper puts forward a new load method to deal with structural bifurcation point instability based on FEM. The unloading step obliterates the disturbance entirely, and the load method can get exact bifurcation point. The simple example demonstrates that the load method is practical and effective.