Numerical and experimental investigations of nonlinear S0 Lamb mode for detection of fatigue damage

Ma, Congyun; Zhu, Wujun; Xiang, Yanxun; Zhang, Haiyan

doi:10.1109/ultsym.2017.8092536

Cited by 1 publication

(1 citation statement)

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“…Meanwhile, the quasi-cumulative effect is persistent within a rather wide lowfrequency range, conducive to the frequency selection of the probing signals. With the second harmonic S0 mode Lamb waves, attempts were made to detect incipient damages like plasticity [15], fatigue [16], and thermal damage [17]. Most reported studies used the first arrivals in the Lamb wave signals.…”

Section: Introductionmentioning

confidence: 99%

A metamaterial-assisted coda wave interferometry method with nonlinear guided waves for local incipient damage monitoring in complex structures

Shan,

Liu,

Zhang

et al. 2024

Smart Mater. Struct.

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Nonlinear guided waves exhibit high sensitivity to material microstructural changes, thus attracting increasing attention for incipient damage monitoring applications. However, conventional nonlinear guided-wave-based methods suffer from two major deficiencies which hinder their applications: 1) mostly relying on the first arrivals of wave signals, they apply to limited inspection areas in simple structures in order to avoid wave reflections from structural discontinuities or boundaries; 2) they are prone to numerous deceptive nonlinear sources in the measurement system which might overwhelm damage-induced signal components. To tackle these challenges, we propose a metamaterial-assisted coda wave interferometry method using second harmonic Lamb waves, applicable to the monitoring of local incipient damage in complex structures. Embracing the metamaterial concept, a so-called meta-screen is designed, whose geometry and layout can be flexibly tailored to target specific inspection zones in a structure. Capitalizing on its customized bandgap features, the proposed meta-screen allows for the passing of fundamental waves while preventing the second harmonic components generated by deceptive nonlinear sources from penetrating into the inspection area. Through numerical analyses on a plate with a rib stiffener, the efficacy of the meta-screen and the influence of occasional disturbance and regular pollution are evaluated. Experimental validations on an adhesive structure also confirm the superior sensitivity of the nonlinear coda waves to incipient damage, which is further enhanced by the deployment of the meta-screen alongside improved robustness against deceptive nonlinear sources outside the inspection area. The proposed metamaterial-assisted coda wave interferometry method with second harmonic Lamb waves holds great promise for local incipient damage monitoring of complex structures.

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Section: Introductionmentioning

confidence: 99%