Assessing the Scaling Subtraction Method for Impact Damage Detection in Composite Plates

AbstractExtensional edge waves propagate along the edges of plates, with low attenuation in the propagation direction and amplitude decreasing rapidly (within one or two wavelengths) in the direction perpendicular to the plate edge. This makes them an ideal candidate for inspecting the edges of plate-like structures. Here, finite-element models and experiments are used to investigate the propagation and scattering of extensional edge waves in composite plates and application to damage detection is demonstrated. Piezoceramic transducers attached to the edge of a 4-mm-thick carbon-fibre-reinforced polymer (CFRP) plate were used to excite 140-kHz edge waves and damage detection demonstrated using two experimental configurations: pitch-catch and two-transducer pulse-echo. Damage due to edge-on impacts of 5 J and 10 J were detected in both configurations. A mass-addition damage model was used to investigate the effect of damage location. Detection was specific to damage within 33 mm (1.5 wavelengths) of the plate edge with propagation unaffected by features beyond that distance. The time of arrival of reflected signals in pulse-echo mode was accurately predicted using the edge-wave group velocity indicating that this configuration can be used for locating damage on edges. The localisation of edge waves means that they can specifically detect damage at the edges of structures, and attenuation measurements indicate that their useful propagation distance is large (5.5 m).

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Impact Damage Detection in Composite Plates using a Self-diagnostic Electro-Mechanical Impedance-based Structural Health Monitoring System

Journal of Multiscale Modelling ◽

10.1142/s1756973715500134 ◽

2015 ◽

Vol 06 (04) ◽

pp. 1550013 ◽

Cited By ~ 35

Author(s):

Z. Sharif-Khodaei ◽

M. Ghajari ◽

M. H. Aliabadi

Keyword(s):

Structural Health Monitoring ◽

Damage Detection ◽

Health Monitoring ◽

Impact Damage ◽

Composite Plates ◽

Mechanical Impedance ◽

Experimental Tests ◽

Health Monitoring System ◽

Structural Health ◽

Faulty Sensors

In this work, application of the electro-mechanical impedance (EMI) method in structural health monitoring as a damage detection technique has been investigated. A damage metric based on the real and imaginary parts of the impedance measures is introduced. Numerical and experimental tests are carried out to investigate the applicability of the method for various types of damage, such as debonding between the transducers and the plate, faulty sensors and impact damage in composite plates. The effect of several parameters, such as environmental effects, frequency sweep, severity of damage, location of damage, etc., on the damage metric has been reported.

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Localization of Barely Visible Impact Damage (BVID) in Composite Plates

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.627.217 ◽

2014 ◽

Vol 627 ◽

pp. 217-220 ◽

Cited By ~ 1

Author(s):

Shi Yang Meng ◽

Zahra Sharif Khodaei ◽

M.H. Aliabadi

Keyword(s):

Damage Detection ◽

Impact Damage ◽

Composite Plates ◽

Structural Features ◽

Detection Technique ◽

Stiffened Panel ◽

Imaging Method ◽

Flat Panel ◽

Isotropic Composite ◽

The Impact

This paper exploits the implementation of a delay-and-sum imaging method using Lamb wave signals to localise barely visible impact damage (BVID) in quasi-isotropic composite panels. The structural discontinuities, such as opening and stiffener, has also been tested to reflect the common structural features of an aircraft and to examine the feasibility of the proposed detection technique. The prediction results are compared with ultrasonic C-scan images, which indicate location error for three different panels –flat panel, flat panel with an opening and stiffened panel. The accuracy is believed to be improved by increasing the number of transducers. Overall the proposed damage detection technique, with the use of only four transducers, demonstrated sufficient accuracy and efficiency in impact damage detection and can be applied alongside the traditional NDT inspections for providing a priori information of the impact damage location.

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Impact damage detection of curved stiffened composite panels by using wavy embedded small-diameter optical fibers

10.1117/12.475090 ◽

2002 ◽

Cited By ~ 2

Author(s):

Hiroaki Tsutsui ◽

Akio Kawamata ◽

Junichi Kimoto ◽

Tomio Sanda ◽

Nobuo Takeda

Keyword(s):

Damage Detection ◽

Optical Fibers ◽

Impact Damage ◽

Small Diameter ◽

Composite Panels ◽

Stiffened Composite Panels

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Experimental Investigation on Improving Electromechanical Impedance Based Damage Detection by Temperature Compensation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.569-570.1132 ◽

2013 ◽

Vol 569-570 ◽

pp. 1132-1139 ◽

Cited By ~ 10

Author(s):

Thomas Siebel ◽

Mihail Lilov

Keyword(s):

Damage Detection ◽

Structural Damage ◽

Temperature Compensation ◽

Impact Damage ◽

Correlation Coefficients ◽

Electromechanical Impedance ◽

Reinforced Plastic ◽

Influence Of Temperature On ◽

Compensation Approach ◽

The Impact

The sensitivity of the electromechanical impedance to structural damage under varying temperature is investigated in this paper. An approach based on maximizing cross-correlation coefficients is used to compensate temperature effects. The experiments are carried out on an air plane conform carbon fiber reinforced plastic (CFRP) panel (500mm x 500mm x 5mm) instrumented with 26 piezoelectric transducers of two different sizes. In a first step, the panel is stepwise subjected to temperatures between-50 °C and 100 °C. The influence of varying temperatures on the measured impedances and the capability of the temperature compensation approach are analyzed. Next, the sensitivity to a 200 J impact damage is analyzed and it is set in relation to the influence of a temperature change. It becomes apparent the impact of the transducer size and location on the quality of the damage detection. The results further indicate a significant influence of temperature on the measured spectra. However, applying the temperature compensation algorithm can reduce the temperature effect at the same time increasing the transducer sensitivity within its measuring area. The paper concludes with a discussion about the trade-off between the sensing area, where damage should be detected, and the temperature range, in which damage within this area can reliably be detected.

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