Journal
JOURNAL OF SOUND AND VIBRATION
Volume 381, Issue -, Pages 206-219Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2016.06.025
Keywords
Nonlinear dynamics; Longitudinal vibration of beams; Breathing crack; Crack detection; Crack localization
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Funding
- Foundation for Polish Science under the research WELCOME [2010-3/2]
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Classical nonlinear vibration methods used for structural damage detection are often based on higher- and sub-harmonic generation. However, nonlinearities arising from sources other than damage - e.g. boundary conditions or a measurement chain - are a primary concern in these methods. This paper focuses on localisation of damage-related nonlinearities based on higher harmonic generation. Numerical and experimental investigations in longitudinal vibration of beams with breathing cracks are presented. Numerical modelling is performed using a two-dimensional finite element approach. Different crack depths, locations and boundary conditions are investigated. The results demonstrate that nonlinearities in cracked beams are particularly strong in the vicinity of damage, allowing not only for damage localisation but also for separation of crack induced nonlinearity from other sources of nonlinearities. (C) 2016 Elsevier Ltd. All rights reserved.
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