A novel damage index for damage detection and localization of plate-type structures using twist derivatives of laser-measured mode shapes

Xu, Weilai; Zhu, Weidong; Cao, Maosen; Wu, Hao; Zhu, Ruihu

doi:10.1016/j.jsv.2020.115448

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…Full laser scanning in this study takes up to several hours depending on the SW sizes, which can encounter difficulties for practical applications to real-world composite structures if their SWs need to be densely sampled. Although densely sampled SWs are to the benefit of imaging small delamination, superfluous sampling points makes the full laser scanning time-consuming; in addition, noise interference can be amplified in derivatives of SWs [72]. Fast laser scanning strategy using a continuously scanning laser Doppler vibrometer is a promising technology to measure SWs in a short time [58].…”

Section: Methodsmentioning

confidence: 99%

Imaging delamination in composite laminates using perturbation to steady-state wavefields

Xu¹,

Cao²,

Su³

et al. 2021

Smart Mater. Struct.

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Delamination in composite laminates, though barely visible, can jeopardize integrity and safety of the composite structures. Interaction of guided waves with delamination in full wavefields have been widely used to graphically characterize the delamination. Recently, steady-state wavefields (SWs) in place of transient wavefields have been used for imaging delamination. However, interaction with delamination can be largely obscured by steady-state waves and hardly observed. Addressing this problem, this study proposes a novel approach for imaging delamination using perturbation to SWs. In particular, a new concept of delamination-caused perturbation to a SW is proposed. Compared to scattered waves from delamination, it is determined by delamination only and naturally sensitive to delamination. Delamination-caused perturbation to a SW is concentrated within the delamination region and rapidly attenuates at undamaged locations. On the basis of this new concept, a delamination index (DI) is established for imaging delamination, by which the delamination can be graphically characterized. The capability of the approach is experimentally validated on composite laminates with delamination, whose SWs are acquired through laser scanning. The experimental results validate that delamination imaging can be achieved by DIs, by which the occurrence, locations, and sizes of the delamination can be graphically characterized.

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Section: Methodsmentioning

confidence: 99%

Imaging delamination in composite laminates using perturbation to steady-state wavefields

Xu¹,

Cao²,

Su³

et al. 2021

Smart Mater. Struct.

Self Cite

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“…Frequency-domain techniques may create many responses and data points by configuring model-update equations [11]. Mode shape [12,13], modal curvatures [14][15][16], natural frequency [17,18], modal strain energy [19,20], the frequency response function [21,22], and the power spectral density function [23][24][25] are some methods of dynamic frequency-domain approaches. Lastly, required data and information in the timefrequency domain are obtained by changing the recorded signal frequency over time [26].…”

Section: Introductionmentioning

confidence: 99%

Life-Cycle Cost Assessment Using the Power Spectral Density Function in a Coastal Concrete Bridge

Hadizadeh-Bazaz

Navarro

2023

JMSE

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Recently, the repair and maintenance of structures has been necessary to prevent these structures’ sudden collapse and to prevent human and financial damage. A natural factor in marine environments that destroys structures and reduces their life is the presence of chloride ions. So regular health monitoring of concrete coastal buildings for on-time repair is essential. This study investigates the performance of the power spectral density (PSD) method as a non-destructive damage-detection method to monitor the location and amount of damage caused by chloride ions during a structure’s life using different approaches according to life-cycle assessment (LCA) and life-cycle cost assessment (LCCA). In this regard, chloride corrosion damage dependent on zone distance from seawater was first calculated to obtain the service life of each part of a coastal concrete bridge according to the conventional method. Based on rebar corrosion each year, the next stage forecasted the bridge’s concrete deterioration. The PSD method monitored the annual loss of reinforcement cross-sectional area, changes in dynamic characteristics such as stiffness and mass, and the bridge structure’s life using sensitivity equations and the linear-least-squares algorithm. Finally, according to the location and quality of damage in each year of bridge life until the end of life, LCC and maintenance and repair costs of the PSD method were compared with the conventional method. The results showed that this strategy was very effective at lowering and optimizing the costs of maintenance and repair caused by chloride corrosion.

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“…Damage in structures can occur and accumulate during their lifetime. In beam-like structures, cracks are one of the most common forms of damage [ 1 ], while periodic manual inspection of structures is still by far the predominant approach to damage detection in practice, in many locations and settings (e.g., off-shore wind turbines), manual inspection may be challenging and costly. To ensure operational safety in such environments, structure structural health monitoring (SHM) techniques based on nondestructive evaluation (NDE) techniques may be a cost-effective alternative, providing the additional benefit of providing continuous feedback to the operator.…”

Section: Introductionmentioning

confidence: 99%

“…The authors used an SLV Polytec PSV-400 with 443 × 443 measurement points. In another work, the authors used the derivatives of laser-measured mode shapes to detect and locate a notch of 20 mm × 20 mm on an aluminum plate of 400 mm × 600 mm using a mesh of 39 × 39 measurements [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Detection and Measurement of Crack-Type Damage Features in Composite Thin-Wall Beams Using Modal Analysis

Pacheco-Chérrez

Cárdenas

Probst

2021

Sensors

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An experimental proof-of-concept for damage detection in composite beams using modal analysis has been conducted. The purpose was to demonstrate that damage features can be detected, located, and measured on the surface of a relatively complex thin-wall beam made from composite material. (1) Background: previous work has been limited to the study of simple geometries and materials. (2) Methods: damage detection in the work is based on the accurate measurement of mode shapes and an appropriate design of the detection mesh. Both a method requiring information about the healthy structure and a baseline-free method have been implemented. (3) Results: short crack-type damage features, both longitudinal and transverse, were detected reliably, and the true length of the crack can be estimated from the damage signal. Simultaneous detection of two cracks on the same sample is also possible. (4) This work demonstrates the feasibility of automated damage detection in composite beams using sensor arrays.

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A novel damage index for damage detection and localization of plate-type structures using twist derivatives of laser-measured mode shapes

Cited by 9 publications

References 29 publications

Imaging delamination in composite laminates using perturbation to steady-state wavefields

Imaging delamination in composite laminates using perturbation to steady-state wavefields

Life-Cycle Cost Assessment Using the Power Spectral Density Function in a Coastal Concrete Bridge

Experimental Detection and Measurement of Crack-Type Damage Features in Composite Thin-Wall Beams Using Modal Analysis

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