2019
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Siegl, M.; Ehrlich, I. Internationale Forschung zum Biege- und Deformationsverhalten von faserverstärkten Kunststoffrohren. Leichtbau Forschungsbericht Ostbayerische Hochschule Regensburg VMK Verlag für Marketing & Kommunikation GmbH & Co. KG, Forschungsbericht 2019, 2019, ISBN: 978-3-9818209-6-6. @techreport{Siegl2019,
title = {Internationale Forschung zum Biege- und Deformationsverhalten von faserverstärkten Kunststoffrohren.},
author = {M. Siegl and I. Ehrlich},
editor = {Ostbayerische Technische Hochschule },
isbn = {978-3-9818209-6-6},
year = {2019},
date = {2019-06-01},
address = {VMK Verlag für Marketing & Kommunikation GmbH & Co. KG},
institution = {Ostbayerische Hochschule Regensburg},
abstract = {Rohre aus faserverstärktem Kunststoff werden unter anderem in der Elektroindustrie und demRohrleitungsbau eingesetzt. Die Gründe dafür sind vielfältig. Speziell Glasfasern bieten nebendem Leichtbaupotential auch sehr gute Isolationseigenschaften. Dabei sind diese Rohre häufigeiner Biegebelastung ausgesetzt, dessen Auswirkungen auf die Struktur sich wegen der komplexenMaterialbeschaffenheit mit gängigen Berechnungsmodellen nicht vollständig beschreiben lassen.Deshalb wird im Rahmen des deutsch-französischen Forschungsprojekts 4-Point-Bending Testsdas Biege- und Deformationsverhalten von faserverstärkten Kunststoffrohren unter Biege -belastung umfassend untersucht.},
type = {Forschungsbericht 2019},
keywords = {},
pubstate = {published},
tppubtype = {techreport}
}
Rohre aus faserverstärktem Kunststoff werden unter anderem in der Elektroindustrie und demRohrleitungsbau eingesetzt. Die Gründe dafür sind vielfältig. Speziell Glasfasern bieten nebendem Leichtbaupotential auch sehr gute Isolationseigenschaften. Dabei sind diese Rohre häufigeiner Biegebelastung ausgesetzt, dessen Auswirkungen auf die Struktur sich wegen der komplexenMaterialbeschaffenheit mit gängigen Berechnungsmodellen nicht vollständig beschreiben lassen.Deshalb wird im Rahmen des deutsch-französischen Forschungsprojekts 4-Point-Bending Testsdas Biege- und Deformationsverhalten von faserverstärkten Kunststoffrohren unter Biege -belastung umfassend untersucht. |
Schlamp, M.; Ehrlich, I. Analyse des Impact-Verhaltens gekrümmter Strukturbauteile von Luftfahrzeugen zur Entwicklung eines Strukturüberwachungssystems für faserverstärkte Kunststoffe - BIRD Leichtbau Forschungsbericht Ostbayerische Hochschule Regensburg VMK Verlag für Marketing & Kommunikation GmbH & Co. KG, Forschungsbericht 2019, 2019, ISBN: 978-3-9818209-6-6 . @techreport{Schlamp2019,
title = {Analyse des Impact-Verhaltens gekrümmter Strukturbauteile von Luftfahrzeugen zur Entwicklung eines Strukturüberwachungssystems für faserverstärkte Kunststoffe - BIRD},
author = {M. Schlamp and I. Ehrlich},
editor = {Ostbayerische Technische Hochschule},
url = {https://www.oth-regensburg.de/fileadmin/media/forschung/Magazin_Forschung/190703_Magazin_Forschung_2019.pdf},
isbn = {978-3-9818209-6-6 },
year = {2019},
date = {2019-06-01},
address = {VMK Verlag für Marketing & Kommunikation GmbH & Co. KG},
institution = {Ostbayerische Hochschule Regensburg},
abstract = {Die in Flugvorausrichtung weisenden Bauteile von Luftfahrzeugen sind oftmals durch Einschlägeaufgrund von Vogelschlag, Hagel oder aufgewirbelten Kleinteilen gefährdet. Diese Einschläge,sogenannte Impacts, weisen bei faserverstärkten Kunststoffen ein stark krümmungs- undmaterialabhängiges Verhalten und Schadensausmaß auf. Impact-Schädigungen führen oftmalszu hohen Reparaturkosten, welche durch eine genauere Kenntnis des Schadens verringert werdenkönnen. Zur Klassifizierung dieser Schädigungen steht dabei vor allem das auftretende Frequenz-signal des Impacts im Fokus der Untersuchungen.},
type = {Forschungsbericht 2019},
keywords = {},
pubstate = {published},
tppubtype = {techreport}
}
Die in Flugvorausrichtung weisenden Bauteile von Luftfahrzeugen sind oftmals durch Einschlägeaufgrund von Vogelschlag, Hagel oder aufgewirbelten Kleinteilen gefährdet. Diese Einschläge,sogenannte Impacts, weisen bei faserverstärkten Kunststoffen ein stark krümmungs- undmaterialabhängiges Verhalten und Schadensausmaß auf. Impact-Schädigungen führen oftmalszu hohen Reparaturkosten, welche durch eine genauere Kenntnis des Schadens verringert werdenkönnen. Zur Klassifizierung dieser Schädigungen steht dabei vor allem das auftretende Frequenz-signal des Impacts im Fokus der Untersuchungen. |
Romano, M.; Ehrlich, I.; Gebbeken, N. Parametric characterization of a mesomechanic kinematic in plain and twill weave 2/2 reinforced composites by FE-calculations. Leichtbau Artikel In: Archives of Materials Science and Engineering (ArchivesMSE), Bd. 1-2, Nr. 97, S. 20-38, 2019, ISSN: 1897-2764. @article{Romano2019,
title = {Parametric characterization of a mesomechanic kinematic in plain and twill weave 2/2 reinforced composites by FE-calculations.},
author = {M. Romano and I. Ehrlich and N. Gebbeken},
url = {HTTPS://ARCHIVESMSE.ORG/RESOURCES/HTML/CMS/MAINPAGE
HTTPS://ARCHIVESMSE.ORG/RESOURCES/HTML/ARTICLESLIST?ISSUEID=12181
HTTPS://ARCHIVESMSE.ORG/RESOURCES/HTML/ARTICLE/DETAILS?ID=190365},
doi = {10.5604/01.3001.0013.2869},
issn = {1897-2764},
year = {2019},
date = {2019-05-01},
journal = {Archives of Materials Science and Engineering (ArchivesMSE)},
volume = {1-2},
number = {97},
pages = {20-38},
abstract = {Purpose: A parametric characterization of a mesomechanic kinematic caused by ondulation in fabric reinforced composites is investigated by numerical investigations. Design/methodology/approach: Due to the definition of plain representative sequences of balanced plain-weave and twill-weave 2/2 fabric reinforced single layers based on sines the variable geometric parameters are the amplitude and the length of the ondulation. Findings: The mesomechanic kinematic can be observed in the FE analyses for both kinds of fabric constructions. Research limitations/implications: The FE analyses consider elasticity and contraction due to Poisson effects, respectively, of the model under selected longitudinal strains. Practical implications: The results are evaluated at relevant positions on the centre-line of the ondulated warp-yarn of the plain representative model. A direct and linear coupling in case of the transversal kinematic behaviour, and thereby a corresponding definite reduction of the evaluated longitudinal strains in terms of the difference of the applied and determined longitudinal strains is identified. Originality/value: Both characteristic purely kinematic reactions due to geometric constraints directly depend on the introduced degree of ondulation. This non-dimensional parameter relates amplitude and length of one complete ondulation, and thus represents the intensity of the ondulation of the respective fabric construction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Purpose: A parametric characterization of a mesomechanic kinematic caused by ondulation in fabric reinforced composites is investigated by numerical investigations. Design/methodology/approach: Due to the definition of plain representative sequences of balanced plain-weave and twill-weave 2/2 fabric reinforced single layers based on sines the variable geometric parameters are the amplitude and the length of the ondulation. Findings: The mesomechanic kinematic can be observed in the FE analyses for both kinds of fabric constructions. Research limitations/implications: The FE analyses consider elasticity and contraction due to Poisson effects, respectively, of the model under selected longitudinal strains. Practical implications: The results are evaluated at relevant positions on the centre-line of the ondulated warp-yarn of the plain representative model. A direct and linear coupling in case of the transversal kinematic behaviour, and thereby a corresponding definite reduction of the evaluated longitudinal strains in terms of the difference of the applied and determined longitudinal strains is identified. Originality/value: Both characteristic purely kinematic reactions due to geometric constraints directly depend on the introduced degree of ondulation. This non-dimensional parameter relates amplitude and length of one complete ondulation, and thus represents the intensity of the ondulation of the respective fabric construction. |
2018
|
Wenzl, C. Comparison of Analytical and Numerical Results for the Deformation of Circular Curved Structures under Pressure Load. Leichtbau Proceedings Article In: Mottok, J.; Reichenberger, M.; Bogner, W. (Hrsg.): Applied Research Conference 2018 – ARC 2018 , S. 150–155, Ostbayerische Technische Hochschule Regensburg Pro Business Verlag, Berlin, 2018, ISBN: 978-3-96409-018-8. @inproceedings{Wenzl2018,
title = {Comparison of Analytical and Numerical Results for the Deformation of Circular Curved Structures under Pressure Load. },
author = {C. Wenzl},
editor = {J. Mottok and M. Reichenberger and W. Bogner},
isbn = {978-3-96409-018-8},
year = {2018},
date = {2018-07-10},
booktitle = {Applied Research Conference 2018 – ARC 2018 },
pages = {150--155},
publisher = {Pro Business Verlag},
address = {Berlin},
organization = {Ostbayerische Technische Hochschule Regensburg},
abstract = {The Ostbayerische Technische Hochschule (OTH Regensburg) conducts studies about the damage process of physical impacts on curved geometries made of fiber reinforced plastics (FRP). These studies are executed to deepen the research in the field of the influence of a structures curvature on the process of a physical impact. Therefore, the damage behaviour and the deformation during an impact are explored. This paper presents an investigation of the deformation-behaviour of circular curved structures under a static pressure load. This simplification from a dynamic to a static problem leads to several analytic solutions. At first, analytic solutions for circular curved structures with isotropic material properties, for example the theorem of Ecsedi and Dluhi for composite arches is going to be considered. Furthermore, the results are verified by a FEM (Finite Element Method) simulation. The simulation is performed with the help of the program ANSYS. This paper provides an overview over several calculation methods for isotropic materials. This information can be used to develop further calculation methods for pressure loaded structures. Especially methods for the calculation of unconstant curved structures have to be improved. },
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
The Ostbayerische Technische Hochschule (OTH Regensburg) conducts studies about the damage process of physical impacts on curved geometries made of fiber reinforced plastics (FRP). These studies are executed to deepen the research in the field of the influence of a structures curvature on the process of a physical impact. Therefore, the damage behaviour and the deformation during an impact are explored. This paper presents an investigation of the deformation-behaviour of circular curved structures under a static pressure load. This simplification from a dynamic to a static problem leads to several analytic solutions. At first, analytic solutions for circular curved structures with isotropic material properties, for example the theorem of Ecsedi and Dluhi for composite arches is going to be considered. Furthermore, the results are verified by a FEM (Finite Element Method) simulation. The simulation is performed with the help of the program ANSYS. This paper provides an overview over several calculation methods for isotropic materials. This information can be used to develop further calculation methods for pressure loaded structures. Especially methods for the calculation of unconstant curved structures have to be improved. |
Ladewig, S. Discussion about Viscosity Theories for Fibre-Reinforced Thermoplastics Leichtbau Proceedings Article In: Mottok, J.; Reichenberger, M.; Bogner, W. (Hrsg.): Applied Research Conference 2018 -- ARC 2018, S. 144–149, Ostbayerische Technische Hochschule Regensburg Pro Business Verlag, Berlin, 2018, ISBN: 978-3-96409-018-8. @inproceedings{Ladewig2018,
title = {Discussion about Viscosity Theories for Fibre-Reinforced Thermoplastics},
author = {S. Ladewig},
editor = {J. Mottok and M. Reichenberger and W. Bogner},
isbn = {978-3-96409-018-8},
year = {2018},
date = {2018-07-10},
booktitle = {Applied Research Conference 2018 -- ARC 2018},
pages = {144--149},
publisher = {Pro Business Verlag},
address = {Berlin},
organization = {Ostbayerische Technische Hochschule Regensburg},
abstract = {The effect of process variables such as shear rate and temperature on the viscosity of polypropylene during the processing of thermoplastic based composites was investigated in this study. The melt impregnation is used in the process of continuous glass fibre reinforced thermoplastic composites. To develop a mathematical model for roving impregnation, it's essential to know about the viscous behaviour of the matrix system. Therefore, this paper will discuss rheological models to describe these phenomena, based on the gathered viscosity data from the partner laboratory at the University of West Bohemia in Pilsen.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
The effect of process variables such as shear rate and temperature on the viscosity of polypropylene during the processing of thermoplastic based composites was investigated in this study. The melt impregnation is used in the process of continuous glass fibre reinforced thermoplastic composites. To develop a mathematical model for roving impregnation, it's essential to know about the viscous behaviour of the matrix system. Therefore, this paper will discuss rheological models to describe these phenomena, based on the gathered viscosity data from the partner laboratory at the University of West Bohemia in Pilsen. |
