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  • A.W van Vuure
A.W van Vuure

A.W van Vuure
KU Leuven | ku leuven · Department of Metallurgy and Materials Engineering

About

188
Publications
50,923
Reads
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3,777
Citations
Citations since 2016
106 Research Items
3009 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Additional affiliations
January 2005 - present
KU Leuven
Position
  • Professor

Publications

Publications (188)
Article
Natural fibre-based materials offer various advantages compared to synthetic fibres, however their applications are limited mainly due to their hygroscopic properties, which are affected by their chemical composition, microstructure and the porosity of the plant cells of which the fibre is composed. Therefore, this work investigates the hygroscopic...
Article
Full-text available
This article introduces stiff and tough biocomposites with in-situ polymerisation of poly (methyl methacrylate) and ductile non-dry flax fibres. According to the results, composites processed with non-dry fibres (preconditioned at 50% RH) had comparable quasi-static in-plane shear strength but 42% higher elongation at failure and toughness than com...
Article
Furfuryl alcohol resins with a varying amount of comonomer inhibiting the conjugation and crosslinking reactions of the resin are synthesised. The pre-resins are briefly characterised to ensure their properties besides composition are similar. Afterwards the pre-resins are cured and their mechanical properties are investigated. There was a markable...
Article
Hybrid PTFE/Kevlar fabric reinforced epoxy composites have widely been used as structural self-lubricating liners. To achieve the best working performance, the Kevlar rich side has to be well impregnated (good wettability), whereas the PTFE rich side must remain dry at the same time. Consequently, it is essential to study the wetting properties of...
Article
Full-text available
Ethiopia has a large coverage of bamboo plants that are used for furniture making and house building. So far, researchers have not studied the strength of Ethiopian bamboo fibers, which are utilized for composite applications. The current study measured the strength of bamboo fibers based on various testing lengths and calculated the predictive ten...
Article
Full-text available
The current studies aim to measure the mechanical strength based on age, harvesting season and bamboo species in Ethiopia. The bamboo fibres are extracted using a roll milling machine, which was developed by the author. The age groups (1, 2 and 3 years), harvesting months (February and November), and bamboo species (Yushania alpina and Bambusa oldh...
Conference Paper
Full-text available
The development of composites reinforced with flax fibres has considerably grown in the last decades [1-3]. However, their sensitivity to relative humidity (RH) limits their use in structural application particularly when exposed in outdoor environments. When the composite is exposed in humid environment it absorbs moisture due to the hydrophilic n...
Article
Full-text available
The purpose of this study was to measure the strength of various bamboo fibres and their epoxy composites based on the bamboo ages and harvesting seasons. Three representative samples of 1-3-year-old bamboo plants were collected in November and February. Bamboo fibres and their epoxy composites had the highest tensile strength and Young's modulus a...
Article
Cellulose nanocrystals (CNCs) offer excellent mechanical properties. However, measuring the strength by performing reliable experiments at the nanoscale is challenging. In this paper, we model Iβ crystalline cellulose using reactive molecular dynamics simulations. Taking the fibril twist into account, structural changes and hydrogen-bonding charact...
Article
The interfacial properties of carbon fiber (CF) reinforced thermoplastic composites depend strongly on the wettability and surface characteristics of the reinforcing fibers, and their compatibility with a chosen matrix. The interface between conventional fibers and thermoplastic matrices is generally weak, due to a lack of specific chemical interac...
Article
Full-text available
The grassland ecosystems in the central Andes of Peru, have extensive vegetation formations dominated by tussock grasslands that are not consumed by Andean livestock (Andean camels, cattle, and sheep), so they are burned by rural inhabitants to cause tender shoots, but that cause serious consequences for the ecosystem and its ecosystem services; ho...
Conference Paper
Full-text available
In-situ testing capabilities of lab-scale industrial computed tomography are rapidly improving. In the present study, the compressive deformation behaviour of a flax fibre-reinforced epoxy composite is studied in an in-situ compression test with stepwise loading, during 3D imaging with X-ray Computed Tomography (XCT). The 3D volumes are processed w...
Article
Full-text available
Hemp is a sustainable source of natural fibres that can contribute to meet the increasing demand for technical applications in the textile and the composite sectors. Continuous reinforcements can be produced using the existing flax machinery, initially developed for textile purposes. To achieve competitive and economically viable fibre yields and a...
Chapter
Composite materials are group of engineering materials which are combinations of more than one material type with the intention of getting specific material properties. The components of the composite may be metals, ceramics, plastic or other materials. The manufacturing methods of composite materials especially fiber reinforced plastics requires c...
Article
Full-text available
The tall grass vegetation in the Andean grassland ecosystems covers the largest area compared to other types of vegetation such as Puna grass, wetland and others. The grasslands are frequently set on fire by livestock farmer, seriously affecting the ecosystem. One way to mitigate this problem is to use these species as a source of plant fibre, whic...
Article
This study evaluates the influence of moisture sorption on the properties of flax fibres and their composites. The radial swelling of both the elementary and technical flax fibres at a wide range of relative humidity (RH) values is determined. Moreover, the effects of moisture sorption on both the thickness swelling and flexural properties of flax/...
Article
Full-text available
The application of natural flax fibre/epoxy composites is growing in the automotive sector due to their good stiffness and damping properties. However, the impact damage resistance of flax/epoxy composites is limited due to the brittle nature of both epoxy and flax fibres and strong fibre/matrix adhesion. Here, biobased thermoplastic cellulose acet...
Article
Full-text available
The arrangement of cellulose molecules in natural environment on the nanoscale is still not fully resolved, with longitudinal disorder in cellulose microfibrils (CMF) being one relevant question. Particularly the length of the dislocated cellulose segments in CMFs is still under debate. Using molecular dynamics simulations, we are first investigati...
Article
Industrial applications using recycled fibres or resins are still rare due to inferior performance to cost ratio. In most cases, glass fibre reinforced polymer (GFRP) materials with thermoset matrices are considered unsuitable for reprocessing and reuse as a valuable reinforcement of composites. In this work, mechanical frictional grinding is utili...
Article
Full-text available
In this work, we study interactions of five different hemicellulose models, i.e. Galactoglucomannan, O-Acetyl-Galactoglucomannan, Fuco-Galacto-Xyloglucan, 4-O-Methylglucuronoxylan, and 4-O-Methylglucuronoarabinoxylan, and their respective binding strength to cellulose nanocrystals by molecular dynamics simulations. Glucuronoarabinoxylan showed the...
Article
This research paper aims to characterize and evaluate the morphological as well as the physical properties of Ethiopian Y. Alpina bamboo based on the effect of age and height. The bamboo has been harvested in the Amhara region in the Injibara town in January 2020. Nine bamboo samples have collected at the age of 1, 2, and 3 years old. Bamboo Culm h...
Article
The combination of ductile Bombyx Mori silk fibre with ductile thermoplastic matrices, combined with the use of a woven fibre architecture, leads to ductile composites with quasi-isotropic strength. Bending and tensile properties were determined for (0,90)s silk twill weave composites, with different thermoplastic polymers and as reference epoxy re...
Article
Full-text available
The high stiffness and damping properties of flax fibres promote the integration of biocomposites in structural applications. However, the strength of flax/epoxy composites is still limited compared to glass/epoxy composites. Graphene oxide (GO) has proved to be a promising building block for nanocomposites due to its high toughness, stiffness and...
Article
Back‐contact solar cells are an interesting technology with advantages over traditional two‐sided cells. A lack of standardized and low‐cost interconnection methods inhibits their market penetration. In an attempt to overcome this obstacle, this work introduces an interconnection technology, based on a fabric of encapsulant with incorporated metal...
Article
A way to model properties of nanomaterials consists of applying well-established approaches based on a macroscopic view of matter, therefore ignoring any peculiar features due to the smallness of these materials. In this work, we inspect the capability of a simple micromechanical model, the inverse rule of mixtures, to predict the elastic modulus o...
Article
Full-text available
In this study, the back calculated compressive properties of flax fibers utilizing the Impregnated Fiber Bundle Test (IFBT) were investigated. The back calculated stress-strain response can be described by the Ramberg-Osgood model. The back calculated compressive modulus of the fiber is similar to its back calculated tensile modulus. The compressiv...
Article
In this study, the microwave-assisted hydrolysis of bamboo (Phyllostachys nigra "Boryana") to 5-hydroxymethylfurfural (HMF) and furfural in a dilute acid (H2O)/methyl isobutyl ketone (MIBK) biphasic system is investigated. Building on previous studies using model components cellulose and xylan, main emphasis in this study is given to the effect of...
Article
Atomistic modelling of cellulose has widely been investigated for years using molecular dynamics simulations. In this paper, we model Iβ crystalline cellulose as well as develop a model including dislocations in between the crystal regions. The model including dislocations shows a tensile modulus of 109 GPa, 25% lower than that of the fully crystal...
Article
The moisture sensitivity of natural fibre composites limits their use in structural applications. Degradation of the fibre–matrix interface is likely to occur when the material is subjected to variable moisture conditions. This study investigates the damage development in unidirectional flax fibre reinforced epoxy composites during hygroscopic cycl...
Article
Full-text available
Coir fibres, a byproduct of the coconut industry, have high performance qualities but are difficult to process by conventional textile methods. The purpose of the research is to combine the processibility of hemp and flax with the high-performance properties of coir to create a composite product worthy of industrial applications. The evaluation of...
Article
This study was performed to evaluate the effect of water immersion ageing on flexural and water sorption properties of composites made of non-dry flax fibres (conditioned at 50% and 80% relative humidities) and resins that have low sensitivity to water. The experimental results showed that throughout the ageing study, composites made of non-dry fib...
Article
The application of natural fibers as reinforcement material in composites can make an important contribution toward a more sustainable bio-based economy. To use these natural fibers, they need to be released from the stem. Traditionally, this is realized by dew retting. However, there are some disadvantages to this retting procedure. Due to changin...
Conference Paper
Full-text available
Printing is inherently associated with the deposition of liquids on solid substrates. In other words, wetting plays a key role in the printing process. However, most fabrics have a complex architecture and it is difficult to control how liquids behave at their contact. To acquire a comprehensive view on the wetting properties of textile, we current...
Article
Full-text available
Hypothesis Measuring contact angles made by liquids around individual carbon fibers (CFs) using the Wilhelmy technique is a conventional method to evaluate their surface properties. However, despite its apparent simplicity, inaccurate measurements of capillary forces and wetted lengths, due to the fineness of the CFs, as well as an improper selecti...
Conference Paper
Full-text available
Back-contact solar cells have shown their potential in the past, with record efficiencies approaching the theoretical maximum value. In parallel, industry-relevant fabrication methods of efficient cells are being developed. Next to this increased power yield, the absence of frontside metallization on the cells greatly improves their aesthetics. The...
Conference Paper
Full-text available
This manuscript presents a new approach to measure the cross sectional areas of elementary fibres using micro-computed tomography. The correct and accurate measurement of the area allows a correct characterization of the strength of the fibre. The accuracy and reliability of tomography was validated through the determination of cross-sectional area...
Conference Paper
Cellulose, being the most abundant natural polymer on earth, has been widely investigated in several theoretical and experimental studies. The highly ordered configuration of cellulose is mostly responsible for its excellent mechanical properties. Recent developments in computer simulations have encouraged scientists to look for the mechanisms cont...
Article
Natural materials such as wood exhibit high mechanical properties through cellulose structured at multiple length scales and embedded in a matrix of similar chemical structure. These hierarchical materials have inspired the design of lightweight composites composed of naturally occurring polymers. However, the close proximity of melt and decomposit...
Article
Full-text available
Natural fibers, such as bamboo, flax, hemp, and coir, are usually different in terms of microstructure and chemical composition. The mechanical properties of natural fibers strongly depend on the organization of cell walls and the cellulose micro-fibril angle in the dominant cell wall layers. Bamboo, flax, and hemp are known for high strength and s...
Conference Paper
Full-text available
Bamboo fibres were exposed to ultraviolet light (UV) radiation to degrade and remove the lignin layer on the surface of the fibre, in order to improve the interfacial bonding strength between fibres and polyvinylidene fluoride (PVDF). Before and after surface treatment, the chemical groups on the fibre surface were analysed through x-ray photoelect...
Article
Full-text available
The effect of treatment of flax with strategic enzyme combinations on the ease of fiber extraction and the chemical fiber composition is reported in this study. To contribute to the increasing demand for bio-based and sustainable materials, it is of great importance to develop optimal enzyme formulations which can replace the yet poorly controlled...
Article
The application of enzymes as alternative to dew retting of flax was studied in correlation to the characteristics of composites reinforced with these natural fibers. Fiber fineness and mechanical properties of biocomposites were evaluated. Furthermore, moisture absorption by biocomposites was studied and fracture surfaces were investigated using S...
Article
Non-dry flax fibre and polyester resin that has low sensitivity to moisture were used in the production of composites and the effects on flexural and moisture sorption properties of composites under wet-dry cycling were determined. Results showed that composites made of non-dry fibre have lower moisture sorption and degree of swelling and shrinking...
Article
The influence of moisture on the mechanical properties of bamboo fibre reinforced composites was assessed both for static and hygroscopic cyclic conditioning. Static conditioning revealed that bamboo fibre reinforced composites show a smaller decrease in Young's modulus with moisture content than other natural fibre reinforced composites such as fo...
Article
Natural fibre (NF) reinforced composites offer high specific mechanical properties and are an ecological alternative to synthetic fibre-reinforced composites. While having great potential, their use today is limited to non-structural applications, mostly with epoxy or polypropylene matrices. This work studies suitable high-performance thermoplastic...
Article
Full-text available
Hypothesis The architecture of complex-shaped fibres affects the motion of the contact line and the evolution of its associated menisci when a fibre is immersed into a liquid. Understanding and predicting the motion of the contact line is critical in the design of complex-shaped fibres for many engineering applications as well as for surface scienc...
Article
Full-text available
Four Phyllostachys species grown in Europe were analysed with the aim of extracting long bamboo fibres for composite applications. The morphological characteristics of the plant were determined and compared to the species grown in their native region. Though the species tend to grow smaller, the Phyllostachys vivax showed similar Young’s modulus as...
Article
Enzymatic treatment of flax is gaining more interest as a promising alternative for dew retting, which is known for its dependence on weather and climate. Therefore, the effect of enzymatic treatments of flax on the effectiveness of fiber separation from each other and chemical fiber composition was investigated in this study. Chemical composition...
Article
More than 1200 bamboo species are known; therefore, the question arises which species are suited for composites and which microstructural characteristics of the plant are decisive. Three different bamboo species are considered, each of two ages. Technical fibre tensile tests and impregnated fibre bundle tests were performed to characterize the fibr...
Thesis
Aramid is already a widely used synthetic fibre in many different high performance composite materials due to its high strength-to-weight ratio and impact resistance. In order to predict the behaviour of these highperformance composite materials, it is not only important to understand the mechanical behaviour of both the fibre and matrix phases the...
Article
Low‐temperature compounding of natural fiber/thermoplastic composites via solid‐state shear pulverization (SSSP) is explored for the first time, with a goal of processing temperature‐sensitive natural fibers with high temperature‐melting engineering thermoplastics without fiber degradation. The model study was based on polyamide 6 (PA6) as the matr...
Article
Full-text available
Enzymes are highly advantageous compared to dew retting to reach fibers of high and consistent quality. However, no unambiguous insights have been retained from the research, i.e. lacking a clear directive of which enzyme activities are strictly needed. Methods for evaluating enzymatic retting should be standardized, with characterization of chemic...
Article
Full-text available
To evaluate compatibility between a substrate and a thermoplastic polymer, the established methodology is to estimate their surface composition in terms of surface energy components, utilizing the results of contact angle measurements of probe liquids onto substrate and polymer surfaces at room temperature. Using this methodology, polymer surfaces...
Article
A new type of fiber reinforced filament materials for Fused Deposition Modeling applications has been developed. Polylactic acid (PLA), compounded with two types of plasticizer, is reinforced with bamboo and flax fibers. The fiber fractions are characterized by measuring their length (l) over diameter (d) before and after compounding so that the ef...