Marc and Mentat combine to deliver a complete solution (pre-processing, solution, and post-processing) for implicit nonlinear FEA. Marc provides the easiest to use and most robust capabilities for contact, large strain, and multiphysics analysis available today to solve static and quasi-static nonlinear problems. Finite element analysis (FEA) has become a critical part of the product development process, but most FEA programs are limited to solving within the limits of linear material properties and displacements, small strains, and small rotations. Many software providers claim to have nonlinear capabilities, but few are able to consistently and reliably solve problems involving changing contact conditions between components and/or large strain (plasticity or elastomeric behavior, for example). When the going gets tough, even some of the most highly regarded nonlinear-focused FEA solvers turn to explicit dynamics and “tricks” (like mass scaling) that change the physics of problems and compromise solution accuracy. Because of these limitations, there are many aspects of product behavior that are not well understood until physical prototypes are available. This leads to late and expensive design changes, product failure in the field, and sometimes, safety issues.