Sergio Minera
Comparing the effect of geometry and stiffness on the effective load paths in non-symmetric laminates
Minera, Sergio; Patni, Mayank; Weaver, Paul; Pirrera, Alberto; O'Donnell, Matthew P.
Authors
Mayank Patni
Paul Weaver
Alberto Pirrera
Matthew P. O'Donnell
Abstract
© 2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. In aerospace composite material design, it is common to encounter load bearing components that vary in thickness across their length. In plate design, ply drops, tow-steering, and the addition of stiffeners, all act to change both the section geometry and the effective stiffness of the part. Often, due to aerodynamic design constraints, the geometric profile must transition non-symmetrically, i.e. thickness is built up from a reference surface, meaning the mid-surface of the plate does not remain on a constant plane. These localised changes in geometry, and associated change of position of the mid-surface, lead to inherently three-dimensional states of stress. As a consequence, and especially for composite structures, there is the potential for significant through-thickness stresses and/or stress concentrations, leading to failure—for example debonding or delamination. By investigating the effects of geometric and effective stiffness changes, we are able to gain physical insight into structural behaviour in the regions of geometric transition. This is achieved through a parametric study, whereby we compare the behaviour as predicted by Classical Laminate Theory—a commonly utilised two-dimensional approach—with a finite element analysis based on the Unified Formulation by Carrera and co-workers. Based on these investigations, we are able to illustrate how rates of profile change and/or stiffness variation are linked to variance in the predicted location of the neutral plane of the two approaches which acts as a proxy measure for predicting through-thickness behaviour. Finally, we discuss the potential opportunity to utilise laminates that possess non-standard layups to tailor the load path through geometric transitions, thus offering a potential route for elastic tailoring that minimises undesirable through-thickness stresses.
Presentation Conference Type | Conference Paper (Published) |
---|---|
Conference Name | AIAA SciTech 2019 Forum |
Start Date | Jan 7, 2019 |
End Date | Jan 11, 2019 |
Acceptance Date | Aug 31, 2018 |
Online Publication Date | Jan 6, 2019 |
Publication Date | Jan 6, 2019 |
Deposit Date | May 5, 2020 |
Publicly Available Date | May 11, 2020 |
ISBN | 9781624105784 |
DOI | https://doi.org/10.2514/6.2019-1766 |
Public URL | https://uwe-repository.worktribe.com/output/5914786 |
Files
Comparing the effect of geometry and stiffness on the effective load paths in non-symmetric laminates
(938 Kb)
PDF
Copyright Statement
This is the author accepted manuscript (AAM). The final published version (version of record) is available onlinevia AIAA at https://arc.aiaa.org/doi/abs/10.2514/6.2019-1766 . Please refer to any applicable terms of use of thepublisher.
You might also like
Can tailored non-linearity of hierarchical structures inform future material development?
(2016)
Journal Article
Helical Lattice Systems: Bespoke Non-linear Elasticity
(2019)
Presentation / Conference Contribution
Thermo-Elastic Composite Helical Lattices - Analysis, Manufacture and Testing
(2019)
Presentation / Conference Contribution
Thermally actuated composite helical lattices
(2017)
Presentation / Conference Contribution
Can Non-symmetry Improve Composite Performance?
(2016)
Presentation / Conference Contribution
Downloadable Citations
About UWE Bristol Research Repository
Administrator e-mail: repository@uwe.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search