A novel lightweight diagnostic film with sensors/actuators and a multiple-path wiring option using inkjet printing was developed. The allows for systematic, accurate, repeatable sensor placement. Furthermore, the is highly flexible adaptable placement on complex configurations. can be attached to surface of structure through uniform secondary boundary procedure or embedded within composite layup during curing. surface-mounted simply peeled off repair replacement without scratching damaging...

Structural Health Monitoring (SHM) of aircraft structures, which are manufactured more and using composite material, is a well-established technique for increasing reliability reducing maintenance costs. Implementing damage inspection algorithms that run in dedicated electronic systems helps reduce big data processing time with improved results. RAPID (Reconstruction Algorithm Probabilistic Inspection Damage) algorithm, developed some years ago, provides to identify characterize damages both...

An effective approach for an embedded piezo diagnostic layer into thick composite material is presented. The effectiveness of the assessed in comparison to surface-mounted layer. proposed manufacturing alleviates difficulties associated with trimming edges composites when embedding wires. Electro-Mechanical Impedance technique used access integrity piezoelectric sensors bonding process. Comparisons ultrasonic guided waves are made between and layers their penetration through across thickness...

A novel multifunctional diagnostic sensor is developed as a cost-effective, in-service structural health monitoring system for determining the initial quality of curing bonded composite repair patch and assessing its long-term durability on structure. The proposed multi-functional technology involves creation 'tailor-to-order' 2D conductive patterns onto step-sanded surface using inkjet printing. In employing this methodology, bondline during in service was successfully assessed via...

Within the scope of this work is study effect damage on electrical hysteretic behaviour carbon nanotube (CNT) reinforced epoxy nanocomposites. For that purpose CNT nanocomposites were subjected to different levels and their response an AC voltage excitation was monitored. The correlation between frequency dependent impedance properties level extensively studied. interrogated specimens from 10 Hz up 0.5 MHz revealed a strong hysteresis studied materials.

We report the on line monitoring of dispersion carbon nanotubes in a typical aerospace epoxy system <italic>via</italic> dielectric spectroscopy.

So far, there is no validated technology for characterizing the dispersion and morphology state of carbon nanotubes (CNTs) aqueous dispersions during sonication. Taking advantage conductive nature CNTs, main hypothesis current study that Electrochemical Impedance Spectroscopy (EIS) an appropriate technique in-situ monitoring qualification CNTs in media. To confirm our hypothesis, we monitored |Z| sonication process as a function type CNTs/admixtures used preparation solutions crucial...

Microcapsule-based carbon fiber reinforced composites were manufactured by wet layup, in order to assess their mechanical properties and determine healing efficiency. Microcapsules at 10%wt. containing bisphenol-A epoxy, encapsulated a urea formaldehyde (UF) shell, employed with Scandium (III) Triflate (Sc (OTf)3) as the catalyst. The investigation was deployed two main directions. first monitored changes performance due presence of agent within composite. More precisely, minor decrease...

Composite repair solutions are applied to recover the strength and functionality of composite structures in service without having replace whole structural part which is impractical for large sections. However, such bonded repairs still not implemented primary aircraft given inability provide repeatable results, ensure uniform bondline absence nondestructive testing methods detecting poor bond. In this paper, a dielectric-based technique proposed monitor curing based on Impedance...

The scope of this study is the real-time monitoring and evaluation healing process using novel testing procedures non-destructive techniques. In work, approach that has been followed intrinsic Diels–Alder (DA) retro-DA mechanism. Two polymers were used as adhesives in single lap-joint specimens subjected to static tensile loading. healed same procedure one before first failure efficiency was assessed by correlation experimental results prior after healing. Acoustic emission infrared...

Carbon nanotube (CNT) enhanced composite materials have attracted the interest of many scientists worldwide, especially in aerospace industry. Fundamental to their qualification as primary aircraft structures is investigation relationship between functional characteristics and long-term behaviour under external combined loads. Conductive reinforcement at nanoscale by definition multifunctional it may (i) enhance structural performance (ii) provide health monitoring functionalities. It now...

A novel strategy is proposed for monitoring of bonded composite repair patch developed and tested. specially designed pattern was inject-printed onto the step-sanded surface providing real time information about bondline structural integrity. The obtained results indicated that methodology able to detect damage induced by an impact event. Infrared thermography (IrT) ultrasound inspection were also employed in order validate methodology.