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Rajabzadeh, Aydin (author), Hendriks, R.C. (author), Heusdens, R. (author), Groves, R.M. (author)
This paper describes a new method for the classification and identification of two major types of defects in composites, namely delamination and matrix cracks, by classification of the spectral features of fibre Bragg grating (FBG) signals. In aeronautical applications of composites, after a damage is detected, it is very useful to know the...
conference paper 2017
document
Groves, R.M. (author)
Fibre optic sensors can measure a range of physics and chemical parameters. Some of the more common fibre optic sensors are the fibre Bragg grating (FBG), the long period grating (LPG), the Fabry-Pérot Interferometer (FPI) and various distributed fibre optic sensors based on optical time-domain reflectometry (OTDR) and optical frequency domain...
conference paper 2017
document
Tonnaer, R. (author), Shroff, S. (author), Groves, R.M. (author)
The strict quality requirements for aerospace composite structures give rise to costly quality control procedures. In automated fibre placement (AFP) these procedures rely heavily on manual inspection leading to long machine downtime periods and a slower production process overall. A preventive non-destructive evaluation technique of the...
conference paper 2017
document
Posthuma de Boer, M. (author), Koldeweij, E. (author), Groves, R.M. (author)
Gilt leather is a decorative art form mainly used for wall hangings from the middle ages onwards. A leather support covered by thin silver leaves is coated with a yellow or orange-brown oil-resin varnish, providing the gold appearance. Further decorations are applied with various oil paints, glazes and varnishes. Complex ageing processes and the...
conference paper 2017
document
Anand, C. (author), Shroff, S. (author), Groves, R.M. (author), Benedictus, R. (author)
Ultrasonic arrays are used for non-destructive evaluation of structures for aerospace and other applications. With the increase in the usage of fibre-reinforced composites in aerospace structures, this evaluation becomes complex due to the effects of attenuation and reflection from the layer boundaries in composite laminates. Hence there is...
conference paper 2017
document
Al-sawaf, F. (author), Groves, R.M. (author)
Mathematical research breakthroughs, in the domain of image processing filters, were recently accomplished by combining non-local means smoothing operations with polynomial regression techniques. We show how inherently noisy speckle interferograms can benefit from these methods, which have been shown to achieve near-optimal noise removal, while...
abstract 2017
document
Ekelund, S.E. (author), Luimes, R.A. (author), Gauvin, C.A.F. (author), Van Duin, P.H.J.C. (author), Jorissen, A.J.M. (author), Ankersmit, H.A. (author), Suiker, A.S.J. (author), Groves, R.M. (author), Schellen, H.L. (author)
Climate induced damage in decorated oak wooden panels is considered to be a high risk for the preeminent museum collections. To advise museums on the development of future sustainable preservation strategies and to define rational guidelines for indoor climate specifications, climate induced physical and mechanical damage has been analysed in a...
conference paper 2017
document
Narayana Swamya, J.K. (author), Lahuerta, F (author), Anisimov, A. (author), Nijssen, R.P.L. (author), Groves, R.M. (author)
In this paper, a method has been developed to use thermography for the quantitative analysis of a delamination area under dynamic loading. To demonstrate this method, a coupon was developed with double shear configuration and an initial delamination consisting of a PTFE insert. The coupon was tested under fatigue loading and an infrared (IR)...
conference paper 2016
document
Tapeinos, I. (author), Koussios, S. (author), Groves, R.M. (author)
This paper outlines the structural performance of a conformable pressurizable tank consisting of intersecting spherical shells (multi-cell tank). Multi-cell tanks outrival conventional multiple cylindrical tanks in volumetric efficiency when required to fit in a rectangular envelope in the automotive industry. When pressurized, the multi-cell ...
journal article 2016
document
Papadakis, V. (author), Muller, B. (author), Hagenbeek, M. (author), Sinke, J. (author), Groves, R.M. (author)
Nowadays, the application of glass-fibre composites in light-weight structures is growing. Although mechanical characterizations of those structures are commonly performed in testing, chemical changes of materials under stresses have not yet been well documented. In the present work coupon tests and Hyperspectral Imaging (HSI) have been used to...
conference paper 2016
document
Herrera-Camus, Rodrigo (author), Bolatto, Alberto (author), Smith, J. D T (author), Draine, Bruce (author), Pellegrini, E. (author), Wolfire, Mark (author), Croxall, Kevin (author), Looze, Ilse De (author), Calzetti, D. (author), Kennicutt, Robert (author), Crocker, A. (author), Armus, Lee (author), Van Der Werf, P. (author), Sandstrom, Karin (author), Galametz, Maud (author), Brandl, B.R. (author), Groves, Brent (author), Rigopoulou, D. (author), Walter, Fabian (author), Leroy, A. (author), Boquien, Mederic (author), Tabatabaei, F. S. (author), Beirão, Pedro (author)
The [NII] 122 and 205 um transitions are powerful tracers of the ionized gas in the ISM: (1) the [NII] 122/205 line ratio can be used to measure the electron density of the low-excitation, ionized gas, and (2) the intensity of these lines is directly related to the flux of ionizing photons, probing the most recent star formation activity. The...
journal article 2016
document
Papadakis, V. (author), Teixeira De Freitas, S. (author), Colijn, R.M. (author), Goedhart, J.J. (author), Poulis, J.A. (author), Groves, R.M. (author)
The adhesion process of bonded structures is a very sensitive manufacturing process, namely to surface contaminations. Nowadays, the adhesion quality of bonded joints can only be detected by destructive testing such as peel tests. But, for actual structures destructive testing of every bonded part is obviously not an option and industry is...
conference paper 2016
document
Groves, R.M. (author), Koldeweij, E. (author), Posthuma de Boer, M. (author)
Das 17. und 18. Jahrhundert gilt als „Goldenes Zeitalter“ des Goldleders in den Nord- und Südniederlanden. Obwohl dieses Material einst ähnlich berühmt war wie die Delfter Keramik, ist unglücklicherweise viel davon verloren gegangen. Gründe dafür sind Renovierungen, Materialzersetzungen und fehlendes Wissen über konservatorische...
journal article 2016
document
Posthuma de Boer, M. (author), Groves, R.M. (author), Koldeweij, E. (author)
Due to its sensitivity, the conservation and upkeep of gilt leather is<br/>often underestimated. It can sincerely be considered as endangered<br/>cultural heritage. This publication describes the current state of<br/>knowledge from the perspectives of Technical Art History, Material<br/>Dynamics, Conservation and Diagnostics, and sets out...
book 2016
document
Groves, R.M. (author)
<br/>The paper gives an assessment of the Indoor Air Quality (IAQ) within a microclimate box and its influence on the material degradation. IAQ is concerned with maintaining acceptable temperature, humidity and oxygen levels and low pollutant levels in the rooms, cabinets or other enclosed spaces, for humans to live and work, while meeting legal...
abstract 2016
document
Tonnaer, R. (author), Shroff, S. (author), Groves, R.M. (author)
The strict quality requirements for aerospace composite struc- tures give rise to costly quality control procedures. In automated bre placement (AFP) these procedures rely heavily on manual work and inspection. This research aims at performing preventative non-destructive evaluation of composite laminate quality based on an online geometric...
abstract 2016
document
Groves, R.M. (author)
other 2016
document
Anisimov, A. (author), Serikova, M.G. (author), Groves, R.M. (author)
Practical development questions of 3D shape shearography technique for surface strain inspection of curved objects are discussed. Results of a global cameras-projector system calibration and different methods of shear distance estimation in 3D are presented
conference paper 2016
document
Al-sawaf, F. (author), Fu, L. (author), Anisimov, A. (author), Frenner, K. (author), Osten, W. (author), Groves, R.M. (author)
other 2016
document
Papadakis, V. (author), Posthuma de Boer, M. (author), Mkhoyan, T. (author), van Velzen, B (author), Seymour, K. (author), Groves, R.M. (author)
Gilt leather was one of the most fashionable and costly types of wall hangings in the Western world in the 16th to 18th centuries. Despite its appearance, it is not real gold that creates the golden shine, but typically a silver leaf which is coated with an orange-brown lacquer to obtain a golden lustre. Gilt leather has its origins in North...
conference paper 2016
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