RAPID analysis of variable stiffness beams and plates: Legendre polynomial triple-product formulation

O'Donnell, Matthew P.; Weaver, Paul M.

Abstract

Copyright © 2017 John Wiley & Sons, Ltd. Numerical integration techniques are commonly employed to formulate the system matrices encountered in the analysis of variable stiffness beams and plates using a Ritz based approach. Computing these integrals accurately is often computationally costly. Herein, a novel alternative is presented, the Recursive Analytical Polynomial Integral Definition (RAPID) formulation. The RAPID formulation offers a significant improvement in the speed of analysis, achieved by reducing the number of numerical integrations that are performed by an order of magnitude. A common Legendre Polynomial basis is employed for both trial functions and stiffness/load variations leading to a common form for the integrals encountered. The Legendre Polynomial basis possesses algebraic recursion relations that allow these integrals to be reformulated as triple-products with known analytical solutions, defined compactly using the Wigner (3j) coefficient. The satisfaction of boundary conditions, calculation of derivatives and transformation to other bases is achieved through combinations of matrix multiplication, with each matrix representing a unique boundary condition or physical effect, therefore permitting application of the RAPID approach to a variety of problems. Indicative performance studies demonstrate the advantage of the RAPID formulation when compared to direct analysis using Matlab's ‘integral’ and ‘integral2’. Copyright © 2017 John Wiley & Sons, Ltd.

• Journal Article Type: Article
• Acceptance Date: Feb 13, 2017
• Online Publication Date: Feb 16, 2017
• Publication Date: Oct 5, 2017
• Deposit Date: May 5, 2020
• Publicly Available Date: May 7, 2020
• Journal: International Journal for Numerical Methods in Engineering
• Print ISSN: 0029-5981
• Electronic ISSN: 1097-0207
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 112
• Issue: 1
• Pages: 86-100
• DOI: https://doi.org/10.1002/nme.5528
• Keywords: Structures, Composites, Integration
• Public URL: https://uwe-repository.worktribe.com/output/5914769