The direct force correction based framework for general co-rotational analysis

TL;DR

This paper introduces a simplified, element-independent framework for co-rotational analysis that avoids complex nonlinear projection matrices, maintaining accuracy while improving simplicity and versatility.

Contribution

The paper develops a new framework for co-rotational analysis that eliminates the need for traditional nonlinear projection matrices, simplifying implementation.

Findings

Results are comparable in accuracy to conventional methods.

Framework is applicable to various element types and local CR frames.

Numerical examples validate the effectiveness of the proposed approach.

Abstract

The use of nonlinear projection matrix in co-rotational (CR) analysis was pioneered by Rankin and Nour-Omid in 1990s (Computers & Structures, 30 (1988) 257-267; Comput. Methods Appl. Mech. Engrg., 93 (1991) 353-384), and has almost became a standard manner for CR formulations deduction over the past thirty years. This matrix however relies heavily on a hysterical and sophisticated derivation of the variation of the local displacements to the global ones, leading to complicated expressions for the internal force vector and the tangent stiffness matrix, which may devalue the simplicity and convenience for the original intention of using CR approach. This paper begins by making a discussion on existing element independent CR formulation and the objective is to develop a new and simple framework for general CR analysis that avoids using conventional nonlinear projection matrix. Multiple numerical examples involving various kinds of elements and different choices of element local CR frame are presented to demonstrate the performance of the proposed framework. The outcomes show that for all the examples the accuracy of the results are comparable with those obtained in conjunction with conventional nonlinear projection matrix.