16 research outputs found
Enhancing the fire-resistance performance of composite laminates via multi-scale hybridisation: A review
© 2024 The authors. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.1177/15280837241226988Fibre-reinforced composites laminates (FRCLs) are employed in various applications such as in marine, aerospace, automotive, and civil industries due to their lightweight nature, design tailorability, and superior specific mechanical properties. However, they possess extremely low flame resistance mainly due to the inherent flammability of the polymer matrix. Various treatments have been applied to improve the fire resistance of FRCLs. In particular, hybridisation (fibre hybridisation and polymer hybridisation) is an important technique which is becoming very popular to enhance the thermal performance and flame resistance of FRCLs. This article is a comprehensive review of the recent developments that broadly cover the improvements in fire resistance of composite laminates via multi-scale hybridisation; the characteristics of thermal decomposition of FRCLs have been presented to comprehend the need for flame retardancy. Approaches for improving the fire resistance of FRCLs and thermal stability, both in polymer and in fibre systems, are discussed. Enhancing the fire resistance has been significant through additives to the matrix, use of flame-retardant modified fibres at interfacial regions and by way of multi-layered hybrid laminates besides hybridization at fibre, yarn and layer level. Finally, a review is presented on the modelling of fire resistance of composite laminates by considering thermo-mechanical models for the prediction of decomposition and failure of laminates at elevated temperatures.Published versio
Investigation of deformation behaviour of dry textiles under forming forces by computed tomography
Worldwide remerging of SARS CoV-2 (Severe acute respiratory syndrome coronavirus 2) linked with COVID-19: current status and prospects
A novel coronavirus virus (2019-nCov) emerged in China in December 2019, which posed an International Public Health Emergency in a couple of weeks, and very recently entered World Health Organization (WHO) status as a very high-risk group. The International Committee on Virus Taxonomy (ICTV) called this virus the Extreme Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2), and the disease is known as Coronavirus Disease-19 (COVID-19). The COVID-19 caused nearly 1,913,391 individuals, out of a total of around 88,861,041 confirmed cases affected by this infection until January 8, 2021. This edition offers a brief overview of the most outstanding features and information about the emerging coronavirus infection, the present worldwide scenario and mechanism of illness, replication and dissemination, as well as ongoing progress in the control and management of this disease, which has now spread to more than 100 countries around the world. Note that researchers worldwide and various health agencies are all working together to stop the spread of this virus and avoid any possible pandemic situation that would otherwise endanger millions of people’s lives. </p
Multi-scale reinforcement of epoxy composites - Use of carbon fibre fabrics coated with an epoxy binder containing MWCNTs for improved interlaminar fracture resistance
Tensile properties of all-polymeric syntactic foam composites: Experimental characterization and mathematical modelling
All-polymer syntactic foams are studied under large strain cyclic and
monotonic tensile loading in order to reveal their tensile stress-strain
behaviour, recoverability, tensile strength, and elongation at break. The
syntactic foam under study here consists of hollow thermoplastic microspheres
(HTMs) of two distinct grades (551 and 920), with distributions of mean-wall
thicknesses and diameters, embedded inside a polyurethane matrix in various
volume fractions. Cyclic loading-unloading curves are recorded, revealing the
level of viscoelasticity exhibited by the materials (which becomes a stronger
effect with increasing volume fractions of HTMs) and indicating the level of
repeatability of loading under large strain. Samples are also subjected to
monotonic tensile loading in order to study their elongation at break. Higher
volume fractions of HTMs increase the stiffness of the material and whilst it
is observed that the materials are highly elastic over a wide range of tensile
strains, damage arises at lower levels of strain for more highly filled
materials. The HTM syntactic foams thus exhibit lower breaking strains compared
to the neat matrix, which is attributed to matrix-microsphere interfacial
debonding. Furthermore, by employing optimization techniques, linear elastic
properties of the microspheres and an average shell thickness of the 551 grade
are inferred by comparing experimental results to predictions from the
Generalized Self-Consistent Method, incorporating polydispersity data on the
size distribution of the microspheres. These results complement previous work
which involved direct experimental measurements of the 920 grade shell
thickness. Results also indicate that the characterization of microsphere
properties is not critically dependent on access to high resolution microsphere
diameter distribution data, provided that an accurate representative mean
diameter is known.Comment: 31 pages, 14 figure
Geometrical and Mechanical Characterisation of Hollow Thermoplastic Microspheres for Syntactic Foam Applications
Recently, hollow thermoplastic microspheres, such as Expancel made by
Nouryon, have emerged as an innovative filler material for use in
polymer-matrix composites. The resulting all-polymer syntactic foam takes on
excellent damage tolerance properties, strong recoverability under large
strains, and favourable energy dissipation characteristics. Despite finding
increasing usage in various industries and applications, including in coatings,
films, sealants, packaging, composites for microfluidics, medical ultrasonics
and cementious composites, there is a near-complete absence of statistical
geometrical information for Expancel microspheres. Further, their mechanical
properties have not yet been reported. In this work we characterise the
geometrical quantities of two classes of Expancel thermoplastic microspheres
using X-ray computed tomography, focused ion beam and electron microscopy. We
also observe the spatial distribution of microspheres within a
polyurethane-matrix syntactic foam. We show that the volume-weighted
polydisperse shell diameter in both classes of microsphere follows a normal
distribution. Interestingly, polydispersity of the shell wall thickness is not
observed and in particular the shell thickness is not correlated to the shell
diameter. We employ the measured geometrical information in analytical
micromechanical techniques in the small strain regime to determine, for the
first time, estimates of the Young's modulus and Poisson's ratio of the
microsphere shell material. Our results contribute to potential future
improvements in the design and fabrication of syntactic foams that employ
thermoplastic microspheres. Given the breadth of fields which utilise
thermoplastic microspheres, we anticipate that our results, together with the
methods used, will be of use in a much broader context in future materials
research.Comment: 19 page, 7 figure, 3 table