An Enriched-FEM Technique for Large Frictional Contact Deformation

An enriched Lagrangian finite element method is presented in modeling large plasticity deformations of contact problems. The technique is used to model contact surface using X-FEM method in large deformations. The contact surfaces are represented independent of the FE mesh and the process is accomplished by integrating enriched elements with a larger number of Gauss points whose position is fixed in the element. The large elasto-plastic deformation formulation is employed within the X-FEM framework to simulate the nonlinear behavior of materials. The interface between two bodies is modeled by using the X-FEM technique and applying the modified level set and Heaviside enrichment functions. Finally, several numerical examples of arbitrary material interfaces are modeled to demonstrate the efficiency of the Lagrangian X-FEM technique in large deformation of plasticity and contact problems.