Non-unit quaternion parametrization of a Petrov-Galerkin Cosserat rod finite element

TL;DR

This paper introduces a finite element formulation for Cosserat rods using non-unit quaternions for orientation parametrization, simplifying virtual work expressions and enabling large displacements, rotations, and strains without singularities.

Contribution

It presents a novel total Lagrangian finite element approach with non-unit quaternion orientation parametrization, ensuring objectivity and singularity-free large deformation analysis.

Findings

Simplifies virtual work functional expressions.

Enables large displacements, rotations, and strains.

Provides a singularity-free orientation parametrization.

Abstract

The application of the Petrov-Galerkin projection method in Cosserat rod finite element formulations offers significant advantages in simplifying the expressions within the discrete virtual work functionals. Moreover, it enables a straight-forward and systematic exchange of the ansatz functions, specifically for centerline positions and cross-section orientations. In this concise communication, we present a total Lagrangian finite element formulation for Cosserat rods that attempts to come up with the least required concepts. The chosen discretization preserves objectivity and allows for large displacements/rotations and for large strains. The orientation parametrization with non-unit quaternions results in a singularity-free formulation.