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20 results on '"Schlothauer, Arthur"'

1. Thin-ply thermoplastic composites: from weak to robust transverse performance through microstructural and morphological tuning

Author

Schlothauer, Arthur, Pappas, Georgios A., and Ermanni, Paolo

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Thin shell carbon fiber composites have great potential for structures that require large recoverable deformations, high stiffness and low weight, as in deployable space structures, biomedical devices and robotics. Despite being astonishingly flexible in fiber direction, thin shells are highly sensitive to off-axis loading. High sensitivity to imperfections, manufacturing limitations and a missing in-depth mechanical understanding hinders the creation of transversely robust shells. This paper provides crucial insights into the factors influencing the transverse strength of ultra-thin composites using a highly accurate manufacturing technique to produce novel thermoplastic thin-ply (35 {\mu}m) carbon fiber-PEEK plies. The effects of fiber type, microstructure and polymer morphology are addressed. It was found that a combination of microstructure tuning and isothermal crystallization can achieve thin shell composites with a 158% improved transverse performance compared to state-of-the-art thermosets. Moreover, this work outlines the sensitivity to all related processing conditions, highlighting the need for accurate control of all named parameters., Comment: 16 Pages, 13 Figures, submitted

Published
2022

9. 3D printed mechanically representative aortic model made of gelatin fiber reinforced silicone composite

Author

Kuthe, Sudhanshu, Schlothauer, Arthur, Bodkhe, Sampada, Hulme-Smith, Christopher, Ermanni, Paolo, Kuthe, Sudhanshu, Schlothauer, Arthur, Bodkhe, Sampada, Hulme-Smith, Christopher, and Ermanni, Paolo

Abstract

Additive manufacturing (AM) is a useful technology to produce artificial aortic models for the training of transcatheter aortic valve replacement (TAVR) surgery. With AM, the models can be tailored towards the individualized aortic anatomy of patients. Most of these reported models so far are manufactured using single rubber-like materials. However, such materials do not replicate the mechanical properties of natural aortic tissue, especially the stress-strain response in higher strain (>0.1) regions. This could be problematic for surgeons training for surgeries using a model which does not exhibit properties of the real aorta. To overcome this limitation, we developed a 3D-printed, mechanically representative aortic model comprising gelatin fibers and silicone. The model is promising as a realistic analog of aortic sinus for mock TAVR surgery. Computerized tomography data was analyzed beforehand using medical imaging to identify the anatomy of a specific patient's aortic sinus and the surrounding blood vessels. A novel silicone matrix composite reinforced with gelatin fibers designed in this work was tested and compared with the stress-strain response of aortic tissue. Such a model comprising both patient-specific geometries as well as realistic material properties of aortic tissue can be helpful for the development of next-generation medical phantoms., QC 20220707

Published
2022
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11. Designing Polymeric Cardiovascular Biomaterials for Hemocompatibility and Mechanical Performance

Author

Chen, Jia Lu, Pappas, Georgios A., Massella, Daniele, Schlothauer, Arthur, Cesarovic, Nikola, Falk, Volkmar, and Ermanni, Paolo

Subjects
sense organs
Abstract

One of the greatest challenges facing polymeric cardiovascular devices is the issue of hemocompatibility. Devices such as polymeric heart valves potentially offer improved mechanical properties and quality of life compared to their animal tissue counterparts. However, they are still strongly limited by problematic interactions with blood. The reduction of platelet adhesion, thrombogenicity, and calcification have been addressed in a variety of surface and bulk modification methods, generally by increasing the hydrophilic character of polymers. However, most hydrophilization processes – oxygen plasma in particular – tend to offer limited longevity. The crystallinity of polymers has previously been observed to influence the extent of platelet adhesion, though the underlying mechanisms for this phenomenon are not clear. In this research, we report on the effect of crystallinity on hemolysis, thrombogenicity, and platelet adhesion in PEEK surfaces. By tailoring the bulk crystallinity, we demonstrate changes in the surface chemical composition and propose a potential strategy to achieve longer term surface modification for improved hemocompatibility. Additionally, we explore the influence of crystallinity on the mechanical properties of thin PEEK films, establishing the multi-dimensional impact of polymer crystallinity. The results shown here may have implications for the design of polymeric cardiovascular devices and considerations that should be taken during material selection.

Published
2021
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15. Fast Prototyping Morphing Wings for Airborne Wind Energy

Author

Galliker, Manuel (author), Schläfli, Florian (author), Bättig, Rik (author), Hensen, Micha (author), Kader, Barzy (author), Macuglia, Mael (author), Mark, Jonas (author), Pagani, Michelle (author), Sigron, Pirmin (author), Zemp, Cédric (author), Fasel, Urban (author), Keidel, Dominic (author), Schlothauer, Arthur (author), Ermanni, Paolo (author), Galliker, Manuel (author), Schläfli, Florian (author), Bättig, Rik (author), Hensen, Micha (author), Kader, Barzy (author), Macuglia, Mael (author), Mark, Jonas (author), Pagani, Michelle (author), Sigron, Pirmin (author), Zemp, Cédric (author), Fasel, Urban (author), Keidel, Dominic (author), Schlothauer, Arthur (author), and Ermanni, Paolo (author)

Published
2019

16. Cure-induced deformation of ultra-thin composite laminates

Author

Bosia, Federico, Schlothauer, Arthur, Leclerc, Christophe, Pellegrino, Sergio, Bosia, Federico, Schlothauer, Arthur, Leclerc, Christophe, and Pellegrino, Sergio

Abstract

In fiber reinforced composite materials, the manufacturing process induces residual stresses and distortions that decrease the mechanical performance of the structure and affect its geometry, especially in thin laminates. Multi-physics simulations were performed to assess the spring-in effect in ultra-thin composite parabolic solar reflectors. For this purpose, a resin kinetic model has been developed by means of differential scanning calorimetry experiments. The kinetic relation has been implemented into the finite element software in order to correctly predict the evolution of the composite degree of cure during the manufacturing process. Specimens were produced in an autoclave and their final geometries were measured by means of a non-contact measuring system and compared with numerical predictions, showing very good agreement.

Published
2018

19. FLEXIBLE SILICONE MOLDS FOR THE RAPID MANUFACTURING OF ULTRA-THIN FIBER REINFORCED STRUCTURES.

Author

Schlothauer, Arthur, Royer, Fabien, Pellegrino, Sergio, and Ermanni, Paolo

Subjects
FIBROUS composites, MOLDS (Casts & casting), MECHANICAL behavior of materials, LAMINATED materials, THREE-dimensional printing
Abstract

Ultra-thin fiber reinforced structures with shell thicknesses below 100 μm are receiving increasing attention, mainly in the field of deployable satellite structures. These structures are prone to post-cure deformation, induced by residual stresses resulting from the cure. This study presents a novel manufacturing technique for quick and efficient prototyping of ultra-thin fiber reinforced structures fabricated from carbon fiber prepreg. The technique relies on sandwiching the composite layup in between silicone molds constrained by a metal cage. The molds are cast using 3D-printed molds. Thermal expansion inside the closed vessel can be used to pressurize the part, enabling an out-of-autoclave process. Several ultra-thin fiber reinforced parts have been manufactured and investigated with regard to their post-cure distortion by means of a noncontact measurement system, showing increased post-cure shape accuracy compared to conventional methods. Microscopic investigations of the shell thickness were performed, revealing sufficient pressure distribution over the part, making the process a promising manufacturing technique for the rapid prototyping of ultra-thin structures. [ABSTRACT FROM AUTHOR]

Published
2018

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