Composite Structural Health Monitoring for MALE UAV Application

Palma, Luigi Di; Sorrentino, Assunta; Vitiello, P.; Izzo, Carmelo

doi:10.4271/2013-01-2159

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Among the different approaches of SHM, guided‐wave‐based strategies are preferred because cost effective, fast, repeatable, able to inspect large structures, sensitive to small damage size, and able to detect both surface and internal damage. [ 7–9 ] However, an accurate knowledge of the dispersive characteristics of guided waves is necessary. Over the years, several methods, including theoretical analysis, experiment and finite element (FE) method (FEM) have been developed for isotropic and anisotropic structures in order to properly define their dispersion behavior, which is very interesting in NDT and SHM applications.…”

Section: Introductionmentioning

confidence: 99%

On the Prediction of Guided Wave Dispersion Curves in Plates for Health Monitoring Applications

Perfetto

Luca

Lamanna

et al. 2021

Macromolecular Symposia

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In the last years, a significant interest has been pointed out in the capability of ultrasonic guided waves as candidate tool for structural health monitoring (SHM), due to their high damage detection sensitivity and low power consumption. The monitoring of the structural health through the propagation of guided waves is complex: some wave phenomena, namely dispersion and slowness, together with boundary scattered waves, may mask the presence of damages. So, studying the dispersion phenomenon through the dispersion curves may be helpful in understanding the propagation mechanisms. As Lamb waves dispersion equations do not generally have analytical solutions, the development of a predictive finite element (FE) model can be a valuable tool for the improvement of SHM systems, avoiding the high cost of experimental campaigns. Thus, once calibrated with respect to an experimental test case, the developed FE model can be used to simulate and predict guided-wave propagation mechanisms in a given structure. This leads to the possibility of employing such approach to identify and localize potential structural damages, that is the final aim of an SHM system. In this work, the FE method, together with an in-house code, has been used to investigate guided wave dispersion phenomenon in plates for possible SHM applications.

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Section: Introductionmentioning

confidence: 99%

On the Prediction of Guided Wave Dispersion Curves in Plates for Health Monitoring Applications

Perfetto

Luca

Lamanna

et al. 2021

Macromolecular Symposia

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“…Indeed, the next step is the integration of the proposed method with an already developed SHM approach for barely visible impact damage (BVID) identification. This study has been already performed by some authors [17,18]. In addition, a direct relationship between the impedance of moisturized specimen and mechanical strength is to be evaluated in order to establish the "residual strength" of the structures during the operation life of aircraft with respect to the current state of the art in level of safety [1].…”

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confidence: 99%

An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics

et al. 2019

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The current design practice of composite material aeronautical structures imposes the use of knock-down structural material allowables to take into account the high sensitivity to environmental exposure (i.e., moisture, temperature, damages). The “moisture derating factor” comes from specific mechanical test campaign and drastically reduces the advantage of using such materials; but the continuous monitoring of the moisture content of the structure could enable the use of higher design allowables. In the framework of FUSIMCO (Work developed within the frame of the Project FUSIMCO-FUSoliera Ibrida Metallo COmposito-co-financed by MIUR-Italian Ministry of Research with DAC-Campania Aerospace District as beneficiary and Leonardo Company-Aerostructure Division as “prime” partner) project, the aim of this study is to verify the effectiveness of the impedance measurement method as a health-monitoring tool to evaluate the moisture quantity absorbed by an aeronautical composite structure. The method is based on the idea that a composite laminate can be associated with an equivalent electric circuit (EEC). Some electrical characteristics of this EEC can be associated to the moisture content of the laminate. A simple EEC model, mainly capacitive, was used. A frequency sweep was the electric stimulus signal of some electrodes, glued onto the specimens to investigate the EEC parameters variation with respect to the induced moisture content variation (gravimetrically determined). The study confirmed the possibility of effectively using the impedance measurement method as a health-monitoring tool for moisture content evaluation of a composite laminate.

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Experimental investigation of damage detection on structures with friction stir welding (FSW) junctions

Sorrentino

Chiariello

Palma

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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A Structural Health Monitoring system for damage detection is proposed in this paper. The Probability Ellipses method (PE) is a non-destructive method based on Guided waves. This method estimates a global index called Damage Index (DI), that represents a way to measure how much critical is the related sensing-path (actuator-sensor). The DI is high when the damage is closer to the sensing-path and it increases again when the damage severity grows. The work is being developed in the framework of the Clean Sky 2 specifically for More Affordable Small Aircraft Manufacturing (SAT-AM) project, whose main goal is the development of new technologies to be employed in the development of next generation of small aircrafts category responding to CS/FAR-23 certification specification Rules. The Friction Stir Welding (FSW) is one of key technologies to reduce cost, time and manufacturing costs. Conversely, the low historical data on structural degradation of FSW joints require a conservative approach during design stage. A possible answer to the lack of structural knowledge behavior could be overpassed by using structural health monitoring system that periodically evaluates the born of any criticalities of the FSW structures. Preliminary experimental investigations of the ET method, applied to structures with Friction Stir Welding (FSW) junctions, are illustrated. Aluminum panels were joined with FSW technique and damage was produced in the junctions. The structures were instrumented with piezoelectric actuators and sensors. The Guided waves were acquired on both undamaged and damaged configurations and the PE method was applied to identify the damage position.

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Composite Structural Health Monitoring for MALE UAV Application

Cited by 4 publications

References 9 publications

On the Prediction of Guided Wave Dispersion Curves in Plates for Health Monitoring Applications

On the Prediction of Guided Wave Dispersion Curves in Plates for Health Monitoring Applications

An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics

Experimental investigation of damage detection on structures with friction stir welding (FSW) junctions

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