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Prof. Sebastian Kölbl

Junior Professorship for Polymeric Materials
Scientific project management

Centre for Applied Research

TC Hutthurm

Academic Director

Scientific Leader Teyhnology Campus Hutthurm

2.02

0991/3615-8002

publications

Sortierung:

Journal article

Sebastian Kölbl
J. Leßlhumer
A. Haider
O. Brüggemann
W. Buchberger

Oxidationsinduktionszeit - das passende Qualitätskriterium für WPC-Terrassendielen?.

In: holztechnologie vol. 58 pg. 38-45

(2017)

show abstract

Over the last years the popularity and approval of wood-polymer composites (WPC) are growing. Particularly in the field of terrace deckings the produced amounts have increased considerably. Outdoor applications lead to the questions of durability of these bio-composites. Therefore, in this work the determination of the oxidation induction time (OIT) as a possible quality criterion for WPC was evaluated. For this purpose, WPC-profiles were produced via direct-extrusion, with different amounts of additives. The produced profiles were treated by artificial weathering and examined continuously. In the course of the work, numerous influencing factors on the measurement were revealed and it was shown that an initial high OIT-value is no warranty for a long-lasting product. Parallelly conducted high-performance liquid chromatography (HPLC) measurements revealed what kind of additive has the biggest influence on the oxidation induction time and to what extent the amount of additives in the bio-composite is decreased by artificial weathering. In den letzten Jahren erfreut sich der Werkstoff WPC zunehmender Beliebtheit und Akzeptanz. Vor allem im Bereich der Terrassendielen (sogenannte "Deckings") sind die produzierten Mengen deutlich angestiegen. Die Anwendung im Außenbereich wirft aber auch die Frage der Dauerhaftigkeit dieser Bio-Composite auf. In der vorliegenden Arbeit wurde daher die Bestimmung der Oxidationsinduktionszeit als ein mögliches Qualitätskriterium für WPC unter die Lupe genommen. Dazu wurden WPC-Profile ohne und mit Additiven mittels Direktextrusion hergestellt, künstlich bewittert und fortlaufend untersucht. Dabei wurden zahlreiche Einflussfaktoren auf die OIT-Messung aufgezeigt sowie dargestellt, dass ein anfänglich hoher OIT-Wert keine Garantie für ein langlebiges Produkt ist. Durch HPLC-Messungen wurde des Weiteren nachgewiesen, welche Additive großen Einfluss auf die Oxidationsinduktionszeit haben und in welchem Maße diese durch UV-Bestrahlung und Beregnung abgebaut werden. Schlüsselwörter: Dauerhaftigkeit, Antioxidationsmittel, UV-Stabilisierung, Oxidationsinduktionszeit, Hochleistungsflüssigchromatographie

Contribution

Chandra Aubeeluck
Sebastian Kölbl
Dmitrii Dobriborsci
Wolfgang Aumer

Design and Development of a Knee Rehabilitation Exoskeleton with Four-Bar Linkage Actuation.

In: 9th International Conference on Control, Decision and Information Technologies (CoDIT). pg. 1618-1623

IEEE

(2023)

DOI: 10.1109/CoDIT58514.2023.10284272

show abstract

In this paper, the design of a lower limb active exoskeleton for rehabilitation purposes is discussed. Active exoskeletons provide the additional required force for motion and gait correction, especially for patients who have suffered from limb impairment. The development was carried out taking into account sensor input for the control system. A Finite-State Machine (FSM) enables the different motions which rely on the data from the torque and acceleration sensors. To replicate the anatomical knee rotation, a four-bar linkage was modelled and integrated in the actuator drive. For this project, a prototype was created using Additive Manufacturing Processes (AMP). The prototype is part of the ‘ForCEs' project at Deggendorf Institute of Technology (DIT) and was tested at an experimental stage for an initial set of results.

Lecture

Chandra Aubeeluck
Sebastian Kölbl
Wolfgang Aumer

Design of the Exoskeleton.

In: The 14th International Design+ Workshop 2023

University of West Bohemia Plzeň, Czech Republic

19.04.2023 (2023)

Lecture

Chandra Aubeeluck
Sebastian Kölbl
Dmitrii Dobriborsci
Wolfgang Aumer

Design and Development of a Knee Rehabilitation Exoskeleton with Four-Bar Linkage Actuation.

In: 9th International Conference on Control, Decision and Information Technologies

Rome, Italy

03.-06.06.2023 (2023)

Lecture

Marc Luger
Valentin Dalbauer
Sebastian Kölbl

Numerical implementation of thermoset curing effects. Posterpräsentation.

In: FEMS EUROMAT 2023

Frankfurt am Main

06.09.2023

Lecture

Nils Rabeneck
Eva-Maria Menges
Chandra Aubeeluck
Michael Schall
Sebastian Kölbl
Matthias Hien
Wolfgang Aumer
Mathias Hartmann

Conception of an automated and intelligent post-processing station for powder-based 3D printing. Posterpräsentation.

In: 4th Symposium on Materials and Additive Manufacturing – Additive 2024

Bremen

12.06.2024 (2024)

Lecture

Marc Luger
Nils Rabeneck
S. Ritzer
Andreas Eckl
Valentin Dalbauer
Sebastian Kölbl

Material Characterization in Simulation-based Approaches on automated Post Processing in Powder Bed 3D Printing. Posterpräsentation.

In: 4th Symposium on Materials and Additive Manufacturing – Additive 2024

Bremen

12.06.2024 (2024)

Lecture

Julia Wallner
Linmei Li
Valentin Dalbauer
Sebastian Kölbl

Faltbare CFK-Struktur für High Power Solar Arrays für Nano- und SmallSats.

In: Münchner Leichtbauseminar 2024

Universität der Bundeswehr München München

23.10.2024 (2024)

Journal article

B. Wagner
A. Ettner-Sitter
N. Ihlo
M. Behr
Sebastian Kölbl
S. Brunner
F. Weber
B. Rau
H. Schlitt
C. Brochhausen
R. Schoenmehl
A. Artinger
D. Schott
M. Pizon
K. Pachmann
Thiha Aung
Silke Härteis
C. Hackl

Patient-derived xenografts from circulating cancer stem cells as a preclinical model for personalized pancreatic cancer research.

In: Scientific Reports (Nature Publishing Group) vol. 15 pg. 2896

23.01.2025 (2025)

DOI: 10.1038/s41598-025-87054-z

show abstract

Patient-derived xenografts (PDXs) provide biologically relevant models and potential platforms for the development of treatment strategies for precision medicine in pancreatic cancer. Furthermore, circulating epithelial tumor cells (CETCs/CTCs) are released into the bloodstream by solid tumors and a rare subpopulation-circulating cancer stem cells (cCSCs) - is considered to be responsible for recurrence and plays a key role in metastasis. For the identification of cCSCs, an innovative in vitro assay to generate tumorspheres was established in this study. The number of tumorspheres and CETCs/CTCs was analyzed perioperatively in 25 pancreatic cancer patients. Additionally, an individual in vivo chorioallantoic membrane (CAM) culture system was used to generate PDXs from these tumorspheres. While overall correlations of CETCs/CTCs with clinicopathological parameters did not reach statistical significance, a significant difference in the number of tumorspheres was observed between patient subgroups with lower and higher UICC stages. This finding underscores their potential as biomarkers, providing valuable insights into clinical decision-making and tumor progression. The application of tumorspheres on the CAM successfully established PDXs within 7 days. These xenografts closely resembled the histological features of the primary tumor. Hence, this model represents a novel and fast option for individualized testing of new therapies for PDAC.

Journal article

Marc Luger
A. Seidel
Ursula Pähler
Sebastian Schröck
Peter Hofmann
Sebastian Kölbl
K. Drechsler

An Ontology‐Augmented Digital Twin for Fiber‐Reinforced Polymer Structures at the Example of Wind Turbine Rotor Blades.

In: Advanced Engineering Materials pg. 1-19

(2025)

DOI: 10.1002/adem.202401437

show abstract

A methodology for establishing a structural digital twin is proposed to facilitate the lifetime prediction of fiber-reinforced polymer (FRP) structures, in this case, a wind turbine rotor blade. The digital twin incorporates production peculiarities and imperfections occurring during the manufacturing process of the FRP component. The methodology involves the computation of process-defined effective elastic properties and residual stresses through numerical simulation of the resin cure cycle. The results are then transferred to a structural finite-element model. By applying local wind conditions to this model, a comprehensive state of stress is obtained. This serves as a basis for a practical evaluation of material fatigue within the composite, leading to the prediction of the component's lifetime. The entire workflow is implemented in a Jupyter-based application that uses an ontology with an appertaining knowledge graph to facilitate the transfer of intermediate results between the observation scales and process steps of the digital twin. In line with the principles of open science, the methodology utilizes open-source software.

labs

Technology Campus Hutthurm

core competencies

polymer extrusion and compounding
polymer analysis
structural lightweight design

Forschungs- und Lehrgebiete

Polymer technologies
Lightweight design and composites
Sustainability