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Modelling the eddy current testing process of carbon fibre textiles
No full textCarbon fibre textiles are a class of high performance materials that for example are used in aerospace
applications. Such applications have exceptionally high requirements regarding quality and reliability
of carbon fibre textiles. Eddy current testing is a non-destructive testing method, which can be applied
to both pure textile as well as the cured carbon fibre reinforced composite. However, the resulting data
is hard to interpret because the local anisotropic conductivity and permittivity divert the signal from one
of a simple metal. Simulation can help to understand the complex current paths in the carbon fibre textile
and their influence on the sensor signal. Feasible modelling strategies are discussed, implemented, and
compared to experimental results of regularly occurring faults in the textile, like gaps in different depths
Investigation of sewing parameters caused fabric damages
No full textIn this study, it was determined the factors that affect the needle damage, which occurs during the sewing
process. In this context, three knitted fabrics (single jersey, 1×1 Rib and pique), sewing direction, needle
point form, needle number and sewing speed parameters were determined as variables and the effect of
the sewing thread was excluded. The sewability properties were evaluated by using L&M Sewability
tester and the fabric damages occurred during sewing process were evaluated by visual evaluation.
Regarding the obtained data, the most important factor causing needle damage during sewing was the
needle number. In order to achieve a high quality of stitch and minimize the formation of needle damage,
determining the appropriate needle number and needle point form comes forward. This study also
reveals the effect of the parameters which should be taken into account during the needle selection such
as the fabric type, the knit structure as well as the loop density
Fabric topgraphy influence on nanofibers deposition
No full textInterest in nanotechnology has increased in recent years and the textile sector has not been left out of
this technology. Obtaining nanofibers opens up multiple applications in fields such as filtration.
However, due to the fragility of said nanofibers, conventional textiles can serve as a support for the
created nanofiber net. In this work we intend to demonstrate the influence of the weave pattern on the
homogeneity of nanofibers deposited on the fabric. Two fabrics characterised by wave patterns showing
different topography are studied. Authors demonstrate there is a strong influence of topography on the
nanofibers deposition. Nanofibers tend to cover wave´s fibres in a higher plane first and it require longer
periods to find some fibres on lower planes
Evolution of the mechanical and morphological properties of two hemp cultivars (santhica 27 and félina 34) during the dew-retted
No full textThe hemp is easy to cultivate in the East of France. SADEF, specialist in plant nutrition, studied this
culture since 2013. But to extract the fiber, the stem must be retting. Actually, the dew retted is the most
used in France. The retted is a very hazardous stage: if the stem is under-retted, the fiber extraction will
be difficult; or if the stem is over-retted; the fiber properties will be degraded. Many factors (the cultivar,
the weather, the duration...) [1–4] impact the fiber quality.
This study observes the evolution of the mechanical and morphological properties of two hemp cultivars
during the dew-retted. Two cultivars, Santhica 27 and Felina 34 were cultivated in 2020 in the East of
France by SADEF. Every week, dew-retted stems were selected during eight weeks. The evaluation of
the fiber quality was performed at the LPMT (Laboratoire de Physique et de Mécanique Textile) in
Mulhouse, France. The color was measured by the DataColor. The fiber linear density was measured by
the VIBROMAT Me followed by its tensile test performed by FAVIMAT [5]. All data were analyzed
by ANOVA method.
The fine fiber proportion increased during the retted. However, the tenacity decreased. At the retted end,
there was no significant difference between the two cultivars mechanical properties
Modern solution of tube telecommunication tower - problems, analysis and perspectives
No full textThe paper emphasizes aspects that have to be addressed when analyzing monopole structures,
such as vortex excitation occurring due to a repeating pattern of vortex shedding in the flow of air around
a tower (von Kármán vortex street). The fatigue analysis is discussed in detail in the paper and it presents
solutions that were introduced on the basis of the analysis results in order to reinforce certain areas of the
tower (stress concentration in the vicinity of structural details required due to technological reasons)
Patent na biodegradowalną folię
No full textAutorka artykułu jest pracownikiem Działu PromocjiArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022Zespół naukowców z Wydziału Biotechnologii i Nauk o Żywności opracował
wytrzymałą folię biodegradowalną powstałą na bazie skrobi. O tym innowacyjnym
i oczekiwanym na rynku rozwiązaniu mówi kierująca projektem prof.
Grażyna Budryn, dyrektor Instytutu Technologii i Analizy Żywności
Can you kill two birds with one stone?
No full textArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022More on the website „Życie Uczelni”– p.lodz.pl/enAleż można. Można częściowo przetworzyć zużytą oponę i stworzyć biodegradowalne
opakowanie, całkowicie nieprzepuszczalne dla powietrza.Yes, you can. You can partially
recycle a used tyre and create
biodegradable packaging that is
completely impermeable to air
Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej nr 160 (2022)
No full textUkazuje się od 1984 r.Opis na podst. nr 27 (1993)Od nr 34 (paźdz. 1995) podtyt.: biuletyn informacyjny Politechniki ŁódzkiejOkładka: projekt red., foto: Jacek Szabela oraz zasoby własne