2019
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Seppenhauser, P. Examinations of the Printer Head Prototype for UV Resins with Continous Fiber-Reinforcement Leichtbau Konferenzbeitrag In: Mottok, J.; Reichenberger, M. (Hrsg.): Applied Research Conference 2019 – ARC 2019, S. 241–248, Ostbayerische Technische Hochschule Regensburg Pro Business Verlag, Berlin, 2019, ISBN: 978-3-96409-182-6. @inproceedings{Seppenhauser2019,
title = {Examinations of the Printer Head Prototype for UV Resins with Continous Fiber-Reinforcement},
author = {P. Seppenhauser},
editor = {J. Mottok and M. Reichenberger},
isbn = {978-3-96409-182-6},
year = {2019},
date = {2019-07-08},
booktitle = {Applied Research Conference 2019 – ARC 2019},
pages = {241--248},
publisher = {Pro Business Verlag},
address = {Berlin},
organization = {Ostbayerische Technische Hochschule Regensburg},
abstract = {Additive manufacturing (AM) technologies with thermoplastic materials have been successfully used for several years in automotive, aerospace and medical industries. The use of UV resins provides high surface strength as well as high chemical resistance. In addition, very fast curing times in the range of a few seconds to fractions of a second are possible. The embedding of inorganic or organic fiber materials such as glass or carbon fibers in plastics leads to an improvement of the specific strength and specific rigidity of the components comparable to high-alloy steels. The aim is the creation of layered, continously fiber-reinforced structures by an AM process. A first printer head prototype was developed for this purpose, consisting of an impregnation, a feed and two curing modules. This paper deals with the design of the modules and their functionality. In summary, it can be said that the modules fulfill their function, but there is still a need for improvement. In particular, the transport of the impregnated fiber roving needs to be improved so that the roving is transportable as well as not too cured before being placed on the printing bed.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Additive manufacturing (AM) technologies with thermoplastic materials have been successfully used for several years in automotive, aerospace and medical industries. The use of UV resins provides high surface strength as well as high chemical resistance. In addition, very fast curing times in the range of a few seconds to fractions of a second are possible. The embedding of inorganic or organic fiber materials such as glass or carbon fibers in plastics leads to an improvement of the specific strength and specific rigidity of the components comparable to high-alloy steels. The aim is the creation of layered, continously fiber-reinforced structures by an AM process. A first printer head prototype was developed for this purpose, consisting of an impregnation, a feed and two curing modules. This paper deals with the design of the modules and their functionality. In summary, it can be said that the modules fulfill their function, but there is still a need for improvement. In particular, the transport of the impregnated fiber roving needs to be improved so that the roving is transportable as well as not too cured before being placed on the printing bed. |
Schimmer, F.; Ladewig, S.; Motsch, N.; Hausmann, J. M.; Ehrlich, I. Comparison of Low-Velocity Impact Damage Behavior of Unidirectional Carbon Fiber-Reinforced Thermoset and Thermoplastic Composites. Leichtbau Artikel In: Key Engineering Materials, 809 (22), S. 9-14, 2019. @article{Schimmer2019,
title = {Comparison of Low-Velocity Impact Damage Behavior of Unidirectional Carbon Fiber-Reinforced Thermoset and Thermoplastic Composites.},
author = {F. Schimmer and S. Ladewig and N. Motsch and J. M. Hausmann and I. Ehrlich},
url = {https://www.scientific.net/KEM.809.9},
doi = {https://doi.org/10.4028/www.scientific.net/KEM.809.9},
year = {2019},
date = {2019-06-01},
journal = {Key Engineering Materials},
volume = {809},
number = {22},
pages = {9-14},
abstract = {This paper investigates the damage behavior of thermoset and thermoplastic fiber-reinforced composites. The specimens were subjected to low-velocity impacts (LVI) to produce barely visible impact damages (BVID). To compare the dependency of the matrix system and the laminate lay-up on the impact damage, four test series were set up. Therefore, laminates with an epoxy (EP) and a polyether ether ketone (PEEK) matrix in a quasi-isotropic (QI) [+45/0/-45/90]2s and an orthotropic (OT) fiber lay-up [0/90]4s were manufactured. To eliminate the influence of variant fiber systems, the thermoplastic tape and the thermoset prepreg contain similar carbon fibers (CF). After impact testing with three different impact energies, inner damages were investigated by using ultrasonic analyses. To get a deeper understanding of the interior damage mechanisms, cross sections of the damaged areas were examined via reflected light microscopy. By using these destructive and non-destructive test methods, significant differences in the damage behavior of composites with thermoplastic and thermoset matrix systems were identified for both laminate lay-ups.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper investigates the damage behavior of thermoset and thermoplastic fiber-reinforced composites. The specimens were subjected to low-velocity impacts (LVI) to produce barely visible impact damages (BVID). To compare the dependency of the matrix system and the laminate lay-up on the impact damage, four test series were set up. Therefore, laminates with an epoxy (EP) and a polyether ether ketone (PEEK) matrix in a quasi-isotropic (QI) [+45/0/-45/90]2s and an orthotropic (OT) fiber lay-up [0/90]4s were manufactured. To eliminate the influence of variant fiber systems, the thermoplastic tape and the thermoset prepreg contain similar carbon fibers (CF). After impact testing with three different impact energies, inner damages were investigated by using ultrasonic analyses. To get a deeper understanding of the interior damage mechanisms, cross sections of the damaged areas were examined via reflected light microscopy. By using these destructive and non-destructive test methods, significant differences in the damage behavior of composites with thermoplastic and thermoset matrix systems were identified for both laminate lay-ups. |
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), 1-2 (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. |
