Toward Vibration-Based Damage Detection: Nonlinear Modal Damping Estimation in Delaminated Structures
Shabnam KIASAT, Ali SALEHZADEH NOBARI, Matteo FILIPPI, Erasmo CARRERA
Abstract. This study presents a nonlinear vibration-based framework for early damage identification in viscoelastic sandwich structures with interfacial delamination. Unlike conventional frequency-based indicators, the proposed approach exploits changes in modal damping, which exhibit higher sensitivity to small and localized defects. Both global damping effects arising from the viscoelastic core and local dissipation due to frictional contact at delaminated interfaces are modeled within a combined time–frequency domain analysis. Nonlinear phenomena, including superharmonic responses, are explicitly captured to improve agreement with experimentally observed behavior. The results demonstrate that pseudo-modal damping parameters provide a robust and reliable indicator for detecting early-stage interfacial damage.
Keywords
Vibration-Based Monitoring, Modal Damping, Delamination, Structural Health Monitoring, Nonlinear Dynamics
Published online 7/20/2026, 5 pages
Copyright © 2026 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Shabnam KIASAT, Ali SALEHZADEH NOBARI, Matteo FILIPPI, Erasmo CARRERA, Toward Vibration-Based Damage Detection: Nonlinear Modal Damping Estimation in Delaminated Structures, Materials Research Proceedings, Vol. 69, pp 1287-1291, 2026
DOI: https://doi.org/10.21741/9781644904251-223
The article was published as article 223 of the book CEAS – AIDAA Conference 2025
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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