53968
2021
deu
lecture
0
--
--
--
Optische Beobachtungen der Faser-Matrix-Trennung im Pull-out-Versuch
Der Vortrag behandelt Rissentstehung und Ausbreitung an Faser-Matrix-Interfaces, untersucht mit dem optischen Mikroskop.
Composites United, CU-Arbeitsgruppe/n Faser-Matrix-Haftung & Matrices
Online meeting
02.12.2021
02.12.2021
publish
false
true
0
Gerhard Kalinka
deu
uncontrolled
Faser
deu
uncontrolled
Matrix
deu
uncontrolled
Pull-out
deu
uncontrolled
Interface
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.3 Polymere Verbundwerkstoffe
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
58094
2023
eng
lecture
0
--
--
--
Carbon fibre composites exemplarily research at BAM
Lightweighting as a cross-cutting technology contributes significantly to achieve the European Green Deal goals. Based on, but not limited to, advanced materials and production technologies, the demand for natural resources and CO2 emmissions are reduced by lightweighting during production, as well as use phase. Therefore, lightweighting is a crucial transformation technology assisting in decoupling economic growth from resource consumption. In this manner, lightweighting contributes significantly as a key technology of relevance for many industrial sectors such as energy, mobility, and infrastructure, towards resource efficiency, climate action and economic strength, as well as a resilient Europe. To strengthen international partnerships, addressing global issues of today at the edge of science with high performance lightweight material based on carbon fibers, an overview about the BAM expertise in carbon fiber reinforced materials is given.
Meeting KCarbon
Berlin, Germany
15.06.2023
publish
false
true
0
Volker Trappe
Gerhard Kalinka
Florian Loose
eng
uncontrolled
Lightweighting
eng
uncontrolled
Carbon Fibers
eng
uncontrolled
Recycling
eng
uncontrolled
Push-out Test
eng
uncontrolled
multi scale testing
Ingenieurwissenschaften und zugeordnete Tätigkeiten
4 Material und Umwelt
4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
5 Werkstofftechnik
5.3 Polymere Verbundwerkstoffe
Umwelt
Circular Economy
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
39128
2017
eng
833
848
9
24
article
Taylor & Francis
UK
1
--
--
--
Circumventing boundary effects while characterizing epoxy/copper interphases using nanoindentation
Characterization of the size and mechanical properties of interphases is essential when designing multicomponent materials. When nanoindentation is used to investigate the size and mechanical properties of an interphase, a common challenge is that the indenter or the stress zone formed around it are often restricted by the reinforcement, making it difficult to distinguish the mechanical property variations caused by the interphase itself from those caused by the boundary effect. In this work, a testing system was developed that allows determining the indent affected zone and accounting for it in the interphase measurements of an epoxy/Cu system. Using finite element analysis, we confirmed the validity of the proposed system. Nanoindentation was used to investigate the Interphase between copper and two different epoxy systems; amine-cured and anhydride-cured. Nanoindentation results showed that a copper layer that is only 10 nm thick still exhibits a constriction effect on the indentations in its vicinity. The amine-cured epoxy did not show any sign of interphase existence using the introduced method. However,
a soft interphase with a thickness of ~1.7 μm was measured on theanhydride-cured epoxy. Furthermore, we show that the proposed system can be used to determine the interphase thickness as well as its relative mechanical properties regardless of the indentation depth.
This system can be further used for investigating other polymer/metal interphases to better understand the factors influencing them, thus helping engineer the interphase size and properties to enhance composite performance.
Composite Interfaces
10.1080/09276440.2017.1286878
0927-6440
1568-5543
18.05.2017
Gerhard Kalinka
K. ElAbshihy
eng
uncontrolled
Interphase
eng
uncontrolled
Polymer-metal
eng
uncontrolled
Epoxy
eng
uncontrolled
Copper
eng
uncontrolled
Composites
eng
uncontrolled
Nanoindentation
Analytische Chemie
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
59053
2023
eng
lecture
0
--
--
--
Testing the fibre matrix interface of short glass fibre reinforced PMCs with using the push out technique
With this presentation, the push-out technique is explained. The focus of the experimental work is on the characterization of the fiber-matrix interface of short fiber reinforced composites. The reinforcing component was glass fibers and the matrix polymer was PA6.6 and PPA.
It is demonstrated for the first time that the push-out technique ca be applied on injection molded short fiber PMC and is sensitive to the mechanical interface properties. Further studies are planned on the influence of multiple processing, the temperature and humidity.
Composirtes United Workshop „Fiber Matrix Interphases“
Online meeting
09.11.2023
09.11.2023
publish
false
true
0
Gerhard Kalinka
eng
uncontrolled
Polymer Matrix Composite
eng
uncontrolled
Glass Fibres
eng
uncontrolled
PA6.6
eng
uncontrolled
PPA
eng
uncontrolled
Push-out Test
eng
uncontrolled
Interface Strength
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.3 Polymere Verbundwerkstoffe
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
45433
2020
eng
101
113
1
29
article
Taylor & Francis
London
The Japan Society for Composite Materials
1
--
--
--
Influence of cooling rate on the properties of carbon fiber unidirectional composites with polypropylene, polyamide 6, and polyphenylene sulfide matrices
The longitudinal and transverse strength of three unidirectional thermoplastic prepreg systems: carbon fiber/polypropylene (CF/PP), polyamide 6 (CF/PA6), and polyphenylene sulfide (CF/PPS) are studied and analytical formulas are proposed for the estimation of matrix and fiber/matrix interface properties from composites properties. Since the matrices are semi-crystalline thermoplastics, the influence of cooling rate on the strength is statistically evaluated. While the 0° tensile strength is found to be independent of the cooling rate, the 90° tensile strength is strongly influenced by the matrix type and cooling rate. The matrix modulus increases as the cooling rate is decreased; the degree of crystallinity also increases. The matrix residual stress, interfacial shear strength, and mode II interlaminar fracture toughness are also found to depend on the cooling rate, with the trends different for different matrices.
Advanced composite materials
0924-3046
1568-5519
10.1080/09243046.2019.1651083
Die originale japanische Version des Artikels erschien in: Journal of the Japan Society for Composite Materials, Jg. 44, Nr. 4 (2018), S. 123-128. - The original Japanese version of the article was published in: Journal of the Japan Society for Composite Materials, vol. 44, no. 4 (2018), pp. 123-128.
29.08.2019
I. Taketa
Gerhard Kalinka
L. Gorbatikh
S. Lomov
I. Verpoest
eng
uncontrolled
Matrix residual stress
eng
uncontrolled
Thermoplastic prepreg
eng
uncontrolled
Unidirectional composites
eng
uncontrolled
Cooling rate
eng
uncontrolled
Interfacial strength
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.3 Polymere Verbundwerkstoffe
Material
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
24341
2011
deu
616
628
10
53
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Einfluss der Mikrostruktur auf den Druck- und Zug-E-Modul teilkristalliner Kunststoffe
In Kooperation zwischen dem Institut für Kunststoffverarbeitung (IKV) und der Bundesanstalt für Materialforschung und -prüfung (BAM) wurde das mechanische Verhalten unter Druck- und Zugbelastung unterschiedlicher morphologischer Strukturen teilkristalliner Thermoplaste (PP und POM) untersucht. Im Ergebnis steigt der E-Modul sowohl der druck- wie auch zugbelasteten Prüfkörper aus spritzgegossenem PP und POM mit gröberem Gefüge an. Probekörper mit scherinduziertem Gefüge zeigen einen hohen Einfluss des Kristallisationsgrads auf den E-Modul.
Materials testing
26997
0025-5300
22.09.2011
W. Michaeli
T. Baranowski
Gerhard Kalinka
deu
uncontrolled
Carbon fibre
deu
uncontrolled
Nanotubes
deu
uncontrolled
Hierarchical composites
deu
uncontrolled
Pull-out test
deu
uncontrolled
Push-out test
Eigenverlag BAM
Datei im Netzwerk der BAM verfügbar ("Closed Access")
4703
2004
eng
poster
0
--
--
--
Micro indentation near stiff-soft phase boundaries
Polydays 2004
4944
Polydays 2004
Potsdam, Germany
2004-10-04
2004-10-06
Gerhard Kalinka
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation
13804
2006
eng
lecture
0
--
--
--
Testing the interface shear strength of carbon fibre reinforced composites
Polydays 2006
15565
Polydays 2006
Berlin, Germany
2006-10-04
0
Gerhard Kalinka
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation
12090
1997
deu
lecture
0
--
--
--
Dynamische Einzelfaserbelastung
Berliner Polymerentage
13796
Berliner Polymerentage
Berlin, Germany
1997-10-09
1997-10-11
0
Volker Hinrichs
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation
12094
1989
deu
poster
0
--
--
--
Ermüdungsverhalten von faserverstärkten Thermoplasten
Präsentationsveranstaltung des Berliner Verbands für Polymerforschung
13802
Präsentationsveranstaltung des Berliner Verbands für Polymerforschung
Berlin, Germany
1989-05-18
Gerhard Kalinka
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation