Clemens Dransfeld
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View article: Quantifying climate impacts of flight operations: A discrete-event life cycle assessment approach
Quantifying climate impacts of flight operations: A discrete-event life cycle assessment approach Open
With initiatives such as the European Green Deal establishing more stringent environmental requirements, there is an increasing need to develop aircraft technologies and sustainable aviation practices with reduced climate impacts. Addition…
View article: Assessment of the variability of unidirectional prepregs at multiple scales
Assessment of the variability of unidirectional prepregs at multiple scales Open
Understanding the microstructural variability in unidirectional composite prepreg tapes is relevant to investigating mechanisms of tape microstructure formation, their impact on its processability and the mechanical performance of the fina…
View article: Solution and precipitation based radical polymerization of renewable vinyl lactones in renewable solvents
Solution and precipitation based radical polymerization of renewable vinyl lactones in renewable solvents Open
Acrylic-type renewable vinyl lactone polymers are made via radical polymerization in bio-based solvents. A precipitation route provides high-purity materials with high optical transparency, highlighting a scalable path for green polymer pr…
View article: On the Influence of Welding Parameters and Their Interdependence During Robotic Continuous Ultrasonic Welding of Carbon Fibre Reinforced Thermoplastics
On the Influence of Welding Parameters and Their Interdependence During Robotic Continuous Ultrasonic Welding of Carbon Fibre Reinforced Thermoplastics Open
Ultrasonic welding of fibre-reinforced thermoplastics is a joining technology with high potential for short welding times and low energy consumption. While the majority of the current studies on continuous ultrasonic welding have so far fo…
View article: Experimental Characterisation of Cure-Dependent Spring-Back Behaviour of Metal-Composite Laminates in a Hot-Pressing Process
Experimental Characterisation of Cure-Dependent Spring-Back Behaviour of Metal-Composite Laminates in a Hot-Pressing Process Open
This study focuses on the spring-back as a function of the degree of cure on single-curved metal-composite laminates. The manufacturing through a hot-pressing process involves different (curing) stages and can reduce the spring-back with t…
View article: Microstructural analysis of unidirectional composites: a comparison of data reduction schemes
Microstructural analysis of unidirectional composites: a comparison of data reduction schemes Open
International audience
View article: A multiscale consolidation model for press molding of hybrid textiles into complex geometries
A multiscale consolidation model for press molding of hybrid textiles into complex geometries Open
Modeling the consolidation of fiber‐reinforced thermoplastic composites at the part level presents a formidable computational challenge due to the multi‐scale nature of the process. In this article, a method to bypass the multi‐scale probl…
View article: An algae-derived partially renewable epoxy resin formulation for glass fibre-reinforced sustainable polymer composites
An algae-derived partially renewable epoxy resin formulation for glass fibre-reinforced sustainable polymer composites Open
A brown algae-based renewable epoxy monomer can outperform bisphenol-A based epoxy resin and composite systems by means of thermomechanical properties.
View article: Multiscale Characterisation of Staple Carbon Fibre-Reinforced Polymers
Multiscale Characterisation of Staple Carbon Fibre-Reinforced Polymers Open
The aim of this study was to characterise the microstructural organisation of staple carbon fibre-reinforced polymer composites and to investigate their mechanical properties. Conventionally, fibre-reinforced materials are manufactured usi…
View article: Synergistic Toughening of Epoxy through Layered Poly(ether imide) with Dual-Scale Morphologies
Synergistic Toughening of Epoxy through Layered Poly(ether imide) with Dual-Scale Morphologies Open
Toughness of epoxies is commonly improved by adding thermoplastic phases, which is achieved through dissolution and phase separation at the microscale. However, little is known about the synergistic effects of toughening phases on multiple…
View article: Editorial: ECCM Research Topic on advanced manufacturing of composites
Editorial: ECCM Research Topic on advanced manufacturing of composites Open
International audience
View article: Quantification of structural response and edge orientation of Chopped Tape Thermoplastic Composites in net-shaped specimens
Quantification of structural response and edge orientation of Chopped Tape Thermoplastic Composites in net-shaped specimens Open
Chopped Tape Thermoplastic Composites (CTTCs) offer high formability and performance for complex-shaped components in the aerospace and automotive industries. However, the mesoscopic discontinuity leads to spatial variabilities and corresp…
View article: Interlaminar and intralaminar fracture resistance of recycled carbon fibre/PPS composites with tailored fibre/matrix adhesion
Interlaminar and intralaminar fracture resistance of recycled carbon fibre/PPS composites with tailored fibre/matrix adhesion Open
The production of advanced composites from recycled carbon fibres (rCFs) is critical for the sustainable development of carbon fibre industry. Herein, non-woven mats consisting of commingled rCFs and Polyphenylene-sulfide (PPS) fibres were…
View article: A model for the consolidation of hybrid textiles considering air entrapment, dissolution and diffusion
A model for the consolidation of hybrid textiles considering air entrapment, dissolution and diffusion Open
A new model is proposed for the consolidation of hybrid textiles, in which air entrapment and dissolution are considered. One of the key parameters is tow permeability, which is described by the analytical model of Gebart and validated at …
View article: Energy analysis of autoclave CFRP manufacturing using thermodynamics based models
Energy analysis of autoclave CFRP manufacturing using thermodynamics based models Open
Autoclave curing is one of the most energy consuming processes in manufacturing carbon fibre reinforced polymers. In order to improve the energy efficiency, one needs to understand energy usage in an autoclave and factors that influence it…
View article: On improving process efficiency and weld quality in ultrasonic welding of misaligned thermoplastic composite adherends
On improving process efficiency and weld quality in ultrasonic welding of misaligned thermoplastic composite adherends Open
This paper evaluates the potential of changing the welding force and the compliance of the energy director (ED) to reduce the effects caused by misaligned adherends, which were: increased through-thickness heating, reduced size of welded a…
View article: Novel tooling for direct melt impregnation of textile with variotherm injection moulding: Methodology and proof of concept
Novel tooling for direct melt impregnation of textile with variotherm injection moulding: Methodology and proof of concept Open
Thermoplastic compression resin transfer moulding coupled with injection moulding is an appealing process for the production of thermoplastic composites. However, its implementation at an industrial scale remains challenging as variotherm …
View article: The effects of misaligned adherends on static ultrasonic welding of thermoplastic composites
The effects of misaligned adherends on static ultrasonic welding of thermoplastic composites Open
Ultrasonic welding is a promising joining technique for thermoplastic composite parts. On the way towards upscaling and industrialisation of this technology, it is crucial to understanding how it is affected by manufacturing tolerances. Th…
View article: In Situ Characterization of the Reaction-Diffusion Behavior during the Gradient Interphase Formation of Polyetherimide with a High-Temperature Epoxy System
In Situ Characterization of the Reaction-Diffusion Behavior during the Gradient Interphase Formation of Polyetherimide with a High-Temperature Epoxy System Open
This study presents two novel methods for in situ characterization of the reaction-diffusion process during the co-curing of a polyetherimide thermoplastic interlayer with an epoxy-amine thermoset. The first method was based on hot stage e…
View article: A single three-parameter tilted fibre Bragg grating sensor to monitor the thermosetting composite curing process
A single three-parameter tilted fibre Bragg grating sensor to monitor the thermosetting composite curing process Open
The unique sensing features of the tilted Fibre Bragg Grating (TFBG) as a single three-parameter optical sensor are demonstrated in this work, to monitor the manufacturing process of composite materials produced using Vacuum Assisted Resin…
View article: Effect of a Dwell Stage in the Cure Cycle on the Interphase Formation in a Poly(ether imide)/High <i>T</i><sub>g</sub> Epoxy System
Effect of a Dwell Stage in the Cure Cycle on the Interphase Formation in a Poly(ether imide)/High <i>T</i><sub>g</sub> Epoxy System Open
Epoxies are inherently brittle materials and to overcome this brittleness, a second microphase (i.e., thermoplastic) is typically added. This modification of epoxy resin using thermoplastics results in reaction-induced phase separating mor…
View article: An inter-ply friction model for thermoset based fibre metal laminate in a hot-pressing process
An inter-ply friction model for thermoset based fibre metal laminate in a hot-pressing process Open
Forming process with pre-stacked and uncured thermoset fibre metal laminate offers improved deformability compared to full-cured laminate especially for the production of complex structural components. This work investigated the friction b…