A Finite Beam Element Framework for Variable Stiffness Structures

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Recently, interest in using spatially variable structural properties has increased significantly due to the perceived benefits associated with composite and functionally graded materials. However, the increased variability of structural properties can exacerbate numerical errors resulting from the modelling assumptions originally derived for prismatic structures. This work is the first of a series we are conducting with the aim to achieve accurate 3D displacement, strain and stress fields using computationally cheap 1D beam elements to model spatially variable wind turbine blades. The strategy developed for this purpose is split into two parts. The rest concerns the automated generation of refined linear beam elements and the second considers the extension of the co-rotational framework in order to provide a straightforward means of using these elements in non-linear analyses. In this paper we focus on the former and propose two enhancements to conventional beam elements. First, a framework for the automated generation of beam elements with a variable number of nodes is developed. Second, an integration scheme designed to take into account spanwise variations of structural properties along the beam element length is introduced. The influence of the proposed improvements on the displacements and strains accuracy of a statically loaded wind turbine blade is presented. Results suggest that this new method successfully improves the accuracy of strain predictions while lowering the number of nodes required in order to reach a converged strain field.
Original languageEnglish
Title of host publication25th AIAA/AHS Adaptive Structures Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages16
ISBN (Electronic)978-1-62410-446-6
DOIs
Publication statusPublished - 12 Jan 2017
Event25th AIAA/AHS Adaptive Structures Conference - Grapevine, Texas, United States
Duration: 9 Jan 201713 Jan 2017

Conference

Conference25th AIAA/AHS Adaptive Structures Conference
CountryUnited States
CityGrapevine, Texas
Period9/01/1713/01/17

Structured keywords

  • Bristol Composites Institute ACCIS

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  • Projects

    Supergen Wind

    Weaver, P. M.

    1/01/1630/06/19

    Project: Research

    Cite this

    Macquart, T., Pirrera, A., & Weaver, P. (2017). A Finite Beam Element Framework for Variable Stiffness Structures. In 25th AIAA/AHS Adaptive Structures Conference American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2017-1873