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Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations

Fibre-reinforced composite structures subjected to complex loads exhibit gradual damage behaviour with the degradation of the effective mechanical properties and changes in their structural dynamic behaviour. Damage manifests itself as a spatial increase in inter-fibre failure and delamination growt...

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Detalles Bibliográficos
Autores principales: Filippatos, Angelos, Gude, Maik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316901/
https://www.ncbi.nlm.nih.gov/pubmed/30501126
http://dx.doi.org/10.3390/ma11122421
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author Filippatos, Angelos
Gude, Maik
author_facet Filippatos, Angelos
Gude, Maik
author_sort Filippatos, Angelos
collection PubMed
description Fibre-reinforced composite structures subjected to complex loads exhibit gradual damage behaviour with the degradation of the effective mechanical properties and changes in their structural dynamic behaviour. Damage manifests itself as a spatial increase in inter-fibre failure and delamination growth, resulting in local changes in stiffness. These changes affect not only the residual strength but, more importantly, the structural dynamic behaviour. In the case of composite rotors, this can lead to catastrophic failure if an eigenfrequency coincides with the rotational speed. The description and analysis of the gradual damage behaviour of composite rotors, therefore, provide the fundamentals for a better understanding of unpredicted structural phenomena. The gradual damage behaviour of the example composite rotors and the resulting damage-dependent dynamic behaviour were experimentally investigated under propagating damage caused by a combination of out-of-plane and in-plane loads. A novel observation is the finding that a monotonic increase in damage results in a non-monotonic frequency shift of a significant number of eigenfrequencies.
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spelling pubmed-63169012019-01-08 Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations Filippatos, Angelos Gude, Maik Materials (Basel) Article Fibre-reinforced composite structures subjected to complex loads exhibit gradual damage behaviour with the degradation of the effective mechanical properties and changes in their structural dynamic behaviour. Damage manifests itself as a spatial increase in inter-fibre failure and delamination growth, resulting in local changes in stiffness. These changes affect not only the residual strength but, more importantly, the structural dynamic behaviour. In the case of composite rotors, this can lead to catastrophic failure if an eigenfrequency coincides with the rotational speed. The description and analysis of the gradual damage behaviour of composite rotors, therefore, provide the fundamentals for a better understanding of unpredicted structural phenomena. The gradual damage behaviour of the example composite rotors and the resulting damage-dependent dynamic behaviour were experimentally investigated under propagating damage caused by a combination of out-of-plane and in-plane loads. A novel observation is the finding that a monotonic increase in damage results in a non-monotonic frequency shift of a significant number of eigenfrequencies. MDPI 2018-11-29 /pmc/articles/PMC6316901/ /pubmed/30501126 http://dx.doi.org/10.3390/ma11122421 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Filippatos, Angelos
Gude, Maik
Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title_full Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title_fullStr Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title_full_unstemmed Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title_short Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations
title_sort influence of gradual damage on the structural dynamic behaviour of composite rotors: experimental investigations
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316901/
https://www.ncbi.nlm.nih.gov/pubmed/30501126
http://dx.doi.org/10.3390/ma11122421
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