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http://hdl.handle.net/10397/67400
Title: | Vibro-Acoustic Modulation (VAM)-inspired structural integrity monitoring and its applications to bolted composite joints | Authors: | Zhang, Z Xu, H Liao, Y Su, Z Xiao, Y |
Issue Date: | 15-Sep-2017 | Source: | Composite structures, 15 Sept. 2017, v. 176, p. 505-515 | Abstract: | Vibro-acoustic modulation (VAM) – one of the prevailing nonlinear methods for material characterization and structural damage evaluation – is based on the effect of modulation of a low-frequency vibration (pumping vibration) on a high-frequency acoustic wave (probing wave). In this study, the contact acoustic nonlinearity (CAN), associated with changes in the solid-solid interface of a bolted joint under VAM, due to bolt loosening, is explored analytically and experimentally, on which basis a VAM-inspired approach is developed for monitoring structural integrity of bolted joints. Numerical simulation based on a theoretical model with structural nonlinear contact stiffness is implemented, to achieve insight into CAN induced by a loose bolt. A quantitative correlation between vibro-acoustic nonlinear distortion and degree of bolt loosening is ascertained. The developed approach is applied to detect bolt loosening in a composite bolted joint and to evaluate the residual torque of the loose bolt quantitatively. Take a step further, the VAM-based nonlinear approach is compared against an elastic wave-based linear method, underscoring a higher sensitivity to bolt loosening. From early awareness of bolt loosening to continuous evaluation of the bolt loosening progress, this VAM-based approach has provided a cost-effective framework for monitoring the health and integrity of a composite bolted joint. | Keywords: | Bolt loosening Composite bolted joint Contact acoustic nonlinearity Structural health monitoring Vibro-acoustic modulation |
Publisher: | Elsevier | Journal: | Composite structures | ISSN: | 0263-8223 | EISSN: | 1879-1085 | DOI: | 10.1016/j.compstruct.2017.05.043 | Rights: | © 2017 Elsevier Ltd. All rights reserved. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Zhang, Z., Xu, H., Liao, Y., Su, Z., & Xiao, Y. (2017). Vibro-acoustic modulation (VAM)-inspired structural integrity monitoring and its applications to bolted composite joints. Composite Structures, 176, 505-515 is available at https://doi.org/10.1016/j.compstruct.2017.05.043 |
Appears in Collections: | Journal/Magazine Article |
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