Node-to-node contact-friction problems using run-time parameter updates on a conventional force-deformation finite element

TL;DR

This paper introduces a run-time parameter update method for node-to-node contact-friction problems in finite element analysis, enabling flexible and efficient modeling of frictional interfaces without modifying core software code.

Contribution

It presents a novel run-time parameter update algorithm for contact-friction modeling in finite elements, applicable to elastic and elasto-plastic elements, avoiding the need for source code modifications.

Findings

Accurate static and dynamic contact simulations compared with closed-form solutions.

Successful modeling of sliding, tipping, and rocking responses of rigid blocks.

Parameter updates enable flexible friction model implementation in larger finite element systems.

Abstract

A novel implementation of the traditional node-to-node Coulomb contact-friction problem is presented that utilizes run-time parameter updates on conventional elasto-plastic elements. The two-noded elements are defined by an independent uniaxial force-deformation (or constitutive) relation in each degree of freedom. The location of the two nodes may or may not be coincident. A parameter is a pointer to a value (nodal geometry, element property, material property, etc.) in the finite element domain that can be controlled by the user. Parameters that control the frictional interface normal and tangential responses are updated based on contact detection, and eliminate the need for adding new source code to the finite element library of a given software. The run-time algorithm for updating both an elastic and elasto-plastic force-deformation element to achieve a penalty-based contact-friction model is presented. Static and dynamic cases were investigated for a two-noded unit process and compared with the results obtained from closed-form solutions. Multiple interface elements were then used for the sliding, tipping, and rocking responses of a rigid block on rigid foundation. Finally, several case studies were investigated, and the findings were compared with the experimental results or solutions from the literature. The proposed friction-contact implementation can be deployed in larger finite element models, and parameter updates facilitate implementation of a wider array of friction models by changing only the constitutive model.