Nonlinear Dynamics of Structures with Material Degradation

P. Soltani, D. J. Wagg, C. Pinna, R. Whear, C. Briody

Research output: Contribution to journalArticle

Abstract

Structures usually experience deterioration during their working life. Oxidation, corrosion, UV exposure, and thermo-mechanical fatigue are some of the most well-known mechanisms that cause degradation. The phenomenon gradually changes structural properties and dynamic behaviour over their lifetime, and can be more problematic and challenging in the presence of nonlinearity. In this paper, we study how the dynamic behaviour of a nonlinear system changes as the thermal environment causes certain parameters to vary. To this end, a nonlinear lumped mass modal model is considered and defined under harmonic external force. Temperature dependent material functions, formulated from empirical test data, are added into the model. Using these functions, bifurcation parameters are defined and the corresponding nonlinear responses are observed by numerical continuation. A comparison between the results gives a preliminary insight into how temperature induced properties affects the dynamic response and highlights changes in stability conditions of the structure.

LanguageEnglish
Article number012123
JournalJournal of Physics: Conference Series
Volume744
Issue number1
DOIs
Publication statusPublished - 3 Oct 2016
Externally publishedYes

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degradation
thermal environments
causes
nonlinear systems
dynamic response
deterioration
corrosion
nonlinearity
harmonics
life (durability)
oxidation
temperature

Bibliographical note

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nonlinear Dynamics of Structures with Material Degradation. / Soltani, P.; Wagg, D. J.; Pinna, C.; Whear, R.; Briody, C.

In: Journal of Physics: Conference Series, Vol. 744, No. 1, 012123, 03.10.2016.

Research output: Contribution to journalArticle

Soltani, P. ; Wagg, D. J. ; Pinna, C. ; Whear, R. ; Briody, C. / Nonlinear Dynamics of Structures with Material Degradation. In: Journal of Physics: Conference Series. 2016 ; Vol. 744, No. 1.
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