Article
Mechanics
Patricia Lucia Zumaquero, Elena Correa, Jesus Justo, Federico Paris
Summary: The study of failure mechanisms in long fiber reinforced composites is crucial for structural design, particularly in understanding transverse damage mechanisms. Experimental results show that secondary tension does not significantly affect failure stress, while secondary compression may accelerate failure.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Manufacturing
F. Javanshour, A. Prapavesis, N. Pournoori, G. C. Soares, O. Orell, T. Parnanen, M. Kanerva, A. W. Van Vuure, E. Sarlin
Summary: This article introduces stiff and tough biocomposites prepared by in-situ polymerisation of poly (methyl methacrylate) and ductile non-dry flax fibres. The results show that composites processed with non-dry fibres have comparable shear strength but higher elongation at failure and toughness compared to composites processed with oven-dried fibres. Additionally, non-dry flax fibres significantly increase the perforation energy of flax-PMMA composites under low-velocity impact. The study also investigates the effect of non-dry fibres on fatigue life and failure mode of the composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Jatupol Surakarnkha, Leong Zhaoyuan, Peng Gong, William Holmes, Pratik Desai, Joel Foreman, Nicola Morley
Summary: Carbon fibre reinforced polymer composites have superior properties and are increasingly used in industries like aerospace. Structural health monitoring is necessary due to their complex failure mechanisms. Magnetostrictive materials have been effective in damage detection but need improvement in spatial sensitivity. It is important to demonstrate ease of fabrication, damage detectability, and maintain a good weight-to-cost trade-off.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Ilaria Papa, Alessia Teresa Silvestri, Maria Rosaria Ricciardi, Valentina Lopresto, Antonino Squillace
Summary: This study focused on manufacturing composite material laminates using the Markforged continuous filament fabrication technique with carbon nanofiber matrix infilled Onyx. Various samples were tested to evaluate the influence of fibers on mechanical properties of composites and the effect of process parameters on 3D-printed sample quality and mechanical behavior through tests such as SEM analysis, tensile and compression tests, and thermogravimetric analysis.
Article
Engineering, Multidisciplinary
Maria Morissa Lu, Carlos A. Fuentes, Aart Willem Van Vuure
Summary: This study evaluates the influence of moisture sorption on the properties of flax fibres and their composites. The study found differences in radial swelling between elementary and technical flax fibres, and suggested that resin constraining effects could contribute to the decrease in composite properties.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Composites
Ulrich A. Mortensen, Lars P. Mikkelsen, Tom L. Andersen
Summary: This study quantitatively observes the fatigue damage in quasi-unidirectional polymer reinforced composites made from basalt fibre non-crimp fabric and epoxy, revealing that the main cause of stiffness degradation is the interaction between transverse and longitudinal fibre bundles in regions subjected to tensile stresses.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dong Quan, Ujala Farooq, Guoqun Zhao, Clemens Dransfeld, Rene Alderliesten
Summary: Exploring routes for the effective use of recycled carbon fibres (rCFs) is critical to improve the fracture toughness of carbon fibre/epoxy composites. This study demonstrated the potential of using rCFs with PPS fibres for interlayer toughening, resulting in significant enhancements in the interlaminar fracture properties. The main toughening mechanisms were found to be fiber bridging for rCF/PPS mats.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Composites
Dong Quan, Jiaming Liu, Liaojun Yao, Clemens Dransfeld, Rene Alderliesten, Guoqun Zhao
Summary: The adhesion between recycled carbon fibres (rCFs) and Polyphenylene-sulfide (PPS) fibres in rCF/PPS composites was tailored by UV-treatment of non-woven mats, leading to improved intralaminar fracture resistance and mechanical properties under tensile and shear loading conditions, but negatively affected interlaminar fracture resistance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Composites
Oscar Asumani, Ratnam Paskaramoorthy
Summary: The study found that alkali-silane treatment significantly improves the fatigue and impact strengths of kenaf fiber reinforced polypropylene composites, with an optimal alkali concentration of 5% to 6%. Microscopy examination revealed that fiber treatments have a significant impact on the damage mechanisms of the composites, with alkali-silane treated composites showing improved fiber-matrix adhesion.
ADVANCED COMPOSITE MATERIALS
(2021)
Article
Mechanics
Carina Witt, Tobias Kaiser, Andreas Menzel
Summary: This paper introduces a generalized continuum model for considering the influence of fiber direction on stored energy, and the application of the model in finite element analysis and isogeometric finite element method. Through two numerical examples, the applicability and accuracy of the model in fiber-reinforced materials are demonstrated.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Polymer Science
Ayyappa Atmakuri, Arvydas Palevicius, Andrius Vilkauskas, Giedrius Janusas
Summary: The impact of matrix material on the mechanical properties of natural-fiber-reinforced hybrid composites was studied through experimental and numerical analysis. The results showed that the hybrid composites outperformed individual fiber composites, with epoxy resin matrix composites exhibiting superior properties to ecopoxy matrix composites.
Article
Materials Science, Multidisciplinary
Diqing Wan, Fan Yang, Jiajun Hu, Shaoyun Dong, Hao Tang, Yu Wang, Yandan Xue, Guoliang Han, Jie Kang, Jingwen Xu, Guanmei Zeng
Summary: In this study, MgO/Mg composites were prepared using direct melt oxidation to investigate the effects of elastic deformation and microplastic deformation on damping properties. It was found that the composites exhibit high damping properties at a specific strain amplitude, indicating effective enhancement of magnesium matrix damping properties by in situ-synthesized oxide particles. Additionally, apart from the G-L dislocation damping mechanism, other damping mechanisms, such as microplastic deformation damping, were identified in MgO/Mg composites through a model and mechanistic analysis.
Article
Polymer Science
Tomas Kuncius, Marius Rimasauskas, Ruta Rimasauskiene
Summary: This study utilized modified FDM technology for the production of continuous carbon fiber-reinforced composites, aiming to evaluate the shear strength of 3D-printed composite structures. Results demonstrated that reducing layer height significantly enhances shear strength, while the impact of printing line width on shear strength is relatively minor. Additionally, there is a linear correlation between shear area and overlap length with shear force.
Review
Engineering, Multidisciplinary
Helena Perez-Martin, Paul Mackenzie, Alex Baidak, Conchur M. O. Bradaigh, Dipa Ray
Summary: PEKK, a part of the PAEK family of polymers, shows excellent mechanical performance and chemical resistance properties, making it a promising candidate as a matrix for high-performance composites. The review paper discusses the crystallisation morphology and structure of PEKK, as well as the impact of carbon fibre inclusions on the crystallisation kinetics in CF/PEKK composites. The article also considers the limitations and future directions of CF/PEKK composites, comparing them to the more established PEEK in relevant discussions.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Manufacturing
Tamas Rev, Michael R. Wisnom, Xiaodong Xu, Gergely Czel
Summary: A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. The results suggest that in practice, tensile failure in the fiber direction is unlikely to be significantly affected by transverse compressive stresses.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Physical
Simon Vander Vennet, Silvia Leitner, Vsevolod Razumovskiy, Werner Ecker, Tom Depover, Kim Verbeken
Summary: This study investigates the effect of a constant load on hydrogen diffusion through a Q&P steel containing metastable retained austenite. The results show that hydrogen diffusion is delayed under all stressed conditions, even at stresses in the elastic regime, with the delay increasing with the applied load. Thermal desorption spectroscopy reveals the presence of a high temperature peak in the samples tested under load, indicating hydrogen effusion and release due to the transformation of retained austenite.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Robin Depraetere, Wim De Waele, Margo Cauwels, Tom Depover, Kim Verbeken, Matthieu Boone, Stijn Hertele
Summary: An experimental study was conducted to investigate the plastic anisotropy and ductile fracture behavior of API 5L X70 pipeline steel with and without hydrogen charging. The presence of hydrogen was found to accelerate ductile damage development and fracture, especially under higher stress triaxiality. These results are important for the development of numerical models to describe hydrogen embrittlement in high-strength low-alloy steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Analytical
Alessia Baleani, Nicola Paone, Jona Gladines, Steve Vanlanduit
Summary: The study focuses on designing a backlit vision instrument for measuring surface roughness and comparing its metrological performance to traditional instruments. It is characterized by a non-contact high-magnification imaging system with short inspection time, allowing for in-line implementation. Using the modulation transfer function, an optimally focused image was obtained by evaluating the imaging conditions of an electrically tunable lens. The comparison between the vision system designed in this study and state-of-the-art instruments showed that the results of the backlit system are compatible with stylus measurements at lower values of roughness, with an overlap of at least 58% based on the analyzed cases.
Article
Metallurgy & Metallurgical Engineering
Simon Vander Vennet, Kim Verbeken, Tom Depover
Summary: A numerical solution of Fick's second law in one dimension with experimentally determined diffusion coefficients at different constant loads is combined with slow strain rate tensile tests and subsequent fractography on dual-phase steel. The depth of the hydrogen embrittled region is determined and correlated to concentration profiles determined by the numerical model. Incorporating stress dependency of the diffusion coefficient results in different concentration profiles compared to using a constant diffusivity, allowing for more accurate determination of a critical local hydrogen concentration based on the total diffusible hydrogen concentration at saturation.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
E. De Ketelaere, D. Moed, M. Vanoppen, A. R. D. Verliefde, K. Verbeken, T. Depover
Summary: This study investigates the inhibition efficiency and mechanism of the sustainable green corrosion inhibitor sodium silicate (SS) for carbon steel in a dynamic 3 wt% NaCl environment. Electrochemical impedance spectroscopy and potentiodynamic scans were performed under variable conditions using a rotating cylinder electrode setup. Increasing the dosage of SS (<=10mM) under constant laminar flow resulted in higher inhibition efficiency (up to 99.8%), attributed to the replacement of water by silicate species and the formation of a more structured film on the steel surface. Increasing the flow rate led to maximum inhibition efficiency at an intermediate flow rate, due to faster transport of silicate and cathodic species to the steel surface and increased mechanical removal of the film.
Article
Chemistry, Physical
Tim Rubben, Tom Depover, Kim Verbeken, Reynier I. Revilla, Vincent Barnier, Alixe Dreano, Frederic Christien, Iris De Graeve
Summary: Scanning Kelvin Probe Force Microscopy (SKPFM) was used to investigate the diffusion of hydrogen in different areas, and a finite element method (FEM) model was developed to simulate the experiment and explain the observed contrast in hydrogen release.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
L. Claeys, L. Deconinck, K. Verbeken, T. Depover
Summary: Austenitic stainless steels (ASS) have attractive characteristics for use in hydrogen service, but the effect of production processes, especially additive manufacturing (AM), on hydrogen interaction is not extensively researched. This study compares the hydrogen embrittlement sensitivity of conventional and additive manufactured 316L ASS and evaluates the advantage of heat treatment and surface roughness reduction post printing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Liese Vandewalle, Tom Depover, Kim Verbeken
Summary: This study evaluates the absorption and trapping of hydrogen in carbide-containing steels at elevated temperatures from a low hydrogen partial pressure atmosphere. The titanium-containing Fe-C steels absorb a significant amount of hydrogen during tempering and exhibit strong trapping ability. This may be attributed to trapping at the carbon-vacancies inside TiC and large undissolved carbides.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Ksenija Nikolic, Jelle De Wispelaere, Gopalakrishnan Ravi, Stijn Hertele, Tom Depover, Kim Verbeken, Roumen H. Petrov
Summary: Damage in bearings is closely related to microstructural alterations, known as white etching areas (WEAs) and white etching cracks (WECs). Non-metallic inclusions, such as manganese sulfides and aluminum oxides, are common in bearing steels. This study classifies 280 non-metallic inclusions according to various criteria and finds that the chemical composition is of secondary importance in damage initiation. The observations suggest that the state of non-metallic inclusion plays a crucial role in initiating rolling contact fatigue damage.
Article
Engineering, Chemical
A. Simons, I. Bellemans, T. Crivits, K. Verbeken
Summary: Vapour explosions were investigated through droplet impingement experiments using the Pb-Sn binary system and the pseudo-binary system PbS-Cu2S. The experiments involved a melt at 600°C (Pb-Sn) or 700°C (PbS-Cu2S) and a water bath at ambient conditions. The interaction was studied using a hydrophone and high-speed camera, allowing for the determination of explosion probability and intensity. The explosion probability had a minimum at approximately 70 wt% Sn, close to the eutectic composition, and increased linearly towards the pure melts. Explosion intensity was lower for lead compared to tin and the eutectic alloy. The effects of liquidus and solidus temperatures and the liquidus-solidus gap on explosion behavior were also investigated.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Mechanics
Olivier Vergote, Inge Bellemans, Amy van den Bulck, Maksym Shevchenko, Roman Starykh, Evgueni Jak, Kim Verbeken
Summary: Heterogeneous slag viscosity measurements are affected by various parameters, such as particle size, shape, solid volume fraction, and shear rate. This study used a viscosity apparatus to experimentally determine all relevant parameters by quenching the sample after measurement. The results showed that the size and volume fraction of spinel particles have an impact on viscosity, and shear thinning is more pronounced at higher shear rates. These findings contribute to the optimization of an equation describing the viscosity increase caused by spinel particles.
JOURNAL OF RHEOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Margo Cauwels, Robin Depraetere, Wim De Waele, Stijn Hertele, Kim Verbeken, Tom Depover
Summary: This study investigates the hydrogen-assisted ductility loss of API 5L X70 pipeline steel and finds that the steel becomes more brittle after hydrogen charging. Notched samples are more susceptible to hydrogen embrittlement compared to unnotched samples, and hydrogen signatures in the form of fisheyes and quasi-cleavage are detected on the fracture surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Analytical
Rudi Penne, Ivan De Boi, Steve Vanlanduit
Summary: A new paradigm is proposed for modelling and calibrating laser scanners with rotation symmetry, using geometric properties to model the device and recovering it through a line-data-driven procedure. The proposed method is validated in a realistic virtual setting.
Article
Engineering, Chemical
Rishav Phukan, Leonardo Guttierez, Wim De Schepper, Marjolein Vanoppen, Kim Verbeken, Katleen Raes, Arne Verliefde, Emile Cornelissen
Summary: Electrodialysis is used in food and bio-based industries for selective separation and recovery of target ions and neutral molecules. Anion exchange membranes (AEM) are prone to fouling due to their complex interactions with organics. This study investigated fouling of two commercial AEM types using three different complex industrial feed streams and found that membrane structure, ion exchange capacity, water uptake, and thickness contributed to the difference in membrane resistance after fouling. LC-OCD analysis revealed highly hydrophilic fractions in the feed and desorption solutions, while foulant desorption was influenced by the solution used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Bikram Koirala, Nicholus Mboga, Robrecht Moelans, Els Knaeps, Seppe Sels, Frederik Winters, Svetlana Samsonova, Steve Vanlanduit, Paul Scheunders
Summary: This study investigates the potential of using optical reflectance in the visible, near-infrared, and shortwave infrared wavelength regions for monitoring oil spills. A physical model and an artificial neural network algorithm were developed to accurately estimate oil thickness and volume, while maintaining stability under changing conditions. Experimental validation was conducted on different types of oil, and the results demonstrate the effectiveness of the proposed method.
