An Efficient Contact Algorithm for Rigid/Deformable Interaction based on the Dual Mortar Method

TL;DR

This paper introduces an efficient dual mortar contact algorithm for rigid/deformable interactions that simplifies computations and reduces matrix bandwidth while maintaining accuracy, applicable to complex 3D problems.

Contribution

It presents a variational formulation using Petrov-Galerkin schemes and a new nodal frame definition to improve efficiency and reduce computational complexity in dual mortar contact methods.

Findings

Reduces computational complexity in 3D contact problems.

Maintains accuracy and robustness with simplified formulations.

Enhances efficiency by decreasing matrix bandwidth.

Abstract

In a wide range of practical problems, such as forming operations and impact tests, assuming that one of the contacting bodies is rigid is an excellent approximation to the physical phenomenon. In this work, the well-established dual mortar method is adopted to enforce interface constraints in the finite deformation frictionless contact of rigid and deformable bodies. The efficiency of the nonlinear contact algorithm proposed here is based on two main contributions. Firstly, a variational formulation of the method using the so-called Petrov-Galerkin scheme is investigated, as it unlocks a significant simplification by removing the need to explicitly evaluate the dual basis functions. The corresponding first-order dual mortar interpolation is presented in detail. Particular focus is, then, placed on the extension for second-order interpolation by employing a piecewise linear interpolation scheme, which critically retains the geometrical information of the finite element mesh. Secondly, a new definition for the nodal orthonormal moving frame attached to each contact node is suggested. It reduces the geometrical coupling between the nodes and consequently decreases the stiffness matrix bandwidth. The proposed contributions decrease the computational complexity of dual mortar methods for rigid/deformable interaction, especially in the three-dimensional setting, while preserving accuracy and robustness.