Thick composite materials are commonly used as load-bearing structures in marine applications. Developing a suitable and sophisticated non-destructive testing (NDT) method for thick composites is an urgent challenge to improve the safety, reliability maintenance of these structures. Digital shearography has become important NDT technique detecting defects thin because advantages high sensitivity deformation change, whole-field measurement. So far, efficacy inspection (e.g. thickness more...

This study aims at improving shearography non-destructive testing (NDT) of deep defects in thick composites with thermal loading. Instead conventional global heating (GH), the core idea is to apply novel spatially modulated (SMH) for NDT. In this paper, finite element method (FEM) has been used advance towards a quantitative inspection tool composites. Both GH and SMH have performed experimentally modelled Abaqus evaluate corresponding efficacies detection defects. was achieved by using...

Thick glass fiber-reinforced polymer (GFRP) composites, e.g. thickness of more than 50 mm, are increasingly used in a wide variety industries, particularly the marine and wind energy sectors. Defect detection characterisation these composites remain appealing challenges due to material complexity presence various manufacturing in-service defects. In this study, we propose novel shearography method with controlled surface temperature (CST) heating for deep defect (i.e., 15 mm depth more)...

The emergence of nano dielectrics for specialized high voltage applications sparked off a variety research activities, which proved that nano-fillers are capable improving the electrical, thermal and mechanical properties polymers. This paper primarily investigates effect addition hBN (hexagonal boron nitride) nanoparticles into an epoxy polymer base by increasing fill-grade, from 0.2 to 5 % volume, two different standpoints: (a) characterizing electrical space charge (S.C.) accumulation...

Shearography is a non-destructive testing technique that provides full-field surface strain characterization. Previous inspection of flat objects or simple geometric shapes has been reported. However, real-life especially in aerospace, transport, cultural heritage are not flat, but their with shearography interest for both hidden defect detection and material Accurate measurement highly curved free-form needs to be performed by combining in-line object shape measuring processing the data 3D....

Monitoring of extreme dynamic loadings on composite materials with high temporal and spatial resolution provides an important insight into the understanding material behaviour. Quantitative measurement surface strain at first moments impact event may reveal initiation failure mechanisms leading to damage. For this purpose, we developed a shearography instrument for measurements during severe µs resolution. This paper presents design, development experimental aluminium samples. The final...

Abstract Current trends in aircraft design are to increase the economic efficiency by integrating different features multifunctional materials. One strategy is embed resistance heater elements between glass‐fibre epoxy layers (heated) fibre metal laminates and use them as anti or de‐icing devices leading edges of wings. Heated glass reinforced aluminium (GLARE) an example such a material where heating functionality was added (certified) structural feature GLARE. As heated innovative rather...

The development of smart materials for embedding in aerospace composites provides enhanced functionality future aircraft structures. Critical flight conditions like icing the leading edges can affect and controllability. Hence, anti-icing de-icing capabilities are used. In case made fibre metal laminates heater elements be embedded between composite layers. However this local heating causes strains stresses structure due to different thermal expansion coefficients laminated materials. order...

The assessment of the structural condition cultural heritage objects is important for conservation interventions and their long-term preservation. This investigation concerns Night Watch (1642), a large-format 17th-century canvas painting by Rembrandt van Rijn that on display in Rijksmuseum, Amsterdam. painting, which has complex treatment history, various damaged areas undergone three wax-resin relinings. In 1975 was slashed twelve times with serrated dinner knife, including several long...

Practical development questions of 3D shape shearography technique for surface strain inspection curved objects are discussed. Results a global cameras-projector system calibration and different methods shear distance estimation in presented.

Shearography (speckle pattern shearing interferometry) is a non-destructive testing technique that provides full-field surface strain characterization. Although real-life objects especially in aerospace, transport or cultural heritage are not flat (e.g. aircraft leading edges sculptures), their inspection with shearography of interest for both hidden defect detection and material Accurate measuring highly curved free form needs to be performed by combining inline object shape processing data...

This work presents the design and latest experimental results on surface strain measurements during an impact event obtained with EXTREME high-speed shearography instrument. The technique is used in this project to provide a quantitative measurement of development at first moments (μs time scale) which may reveal initiation failure mechanisms composite materials. Experimentally measured components over field view will be as input validation data for new numerical analytical models response...

In this study, we compare the hyperspectral imaging capabilities of a custom-built visible light OCT with those commercial grade camera. Using Short-Time-Fourier-Transform algorithm on signal, estimate variation in surface spectral response from two paint pigments. Our study aims at comparing measurements obtained calibration samples and to an optimal working point for OCT-based processing.

This work addresses accurate position measurement of reference marks made retroreective microprismatic materials by image-based systems. High reflection technology implies tiny hermetically sealed pockets, which improve material reflectivity, but result in non-reflective preprinted netting pattern. The mark pattern to be used for measuring can simply printed on the reflective as an opaque area with predefined shape. However, non-reflecting acts a spatial filter that affects resultant...

The performance of defect detection in composite materials using digital shearography is important for correct decisionmaking non-destructive testing. In this work, we compared a high-resolution 24-megapixel still camera (DSLR) and conventional medium-resolution 5-megapixel to determine the detectability blind holes an aerospacegraded carbon-fiber reinforced polymer (CFRP) sample. hole diameters ranged from 0.2 3 mm with material thickness 4 test sample dimensions 200×200 mm. was heated...