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Influence of cathodic dip painting on the mechanical strength of material-adapted composite/metal joints

Gerstenberger C., Osiecki T., Timmel T., Kroll L.

Polimery

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2018

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T. 63, nr 11-12

750--754

PL

Metoda wykorzystująca wiertło tarciowe Flowdrill (flowdrill joining, FDJ) umożliwia łączenie metalu z kompozytami termoplastycznymi wzmocnionymi włóknami ciągłymi (FRTP) bez udziału pomocniczych elementów łączących. W metodzie tej włókna w kompozycie nie są przecinane jak w klasycznym sposobie łączenia, ale rozszerzane, co sprawia, że połączenie cechuje się dużą wytrzymałością. Technika FDJ potencjalnie może być stosowana do konstrukcji lekkich. Ważną cechą wymaganą od wykorzystywanych w przemyśle samochodowym elementów wykonanych wg tej technologii łączenia jest odporność na obciążenia temperaturowe i chemiczne towarzyszące procesom produkcyjnym, takim jak lakierowanie katodowe (CDP). Stwierdzono, że obróbka CDP nie wpływa niekorzystnie na właściwości quasi-statyczne badanych połączeń FDJ, wytrzymują one obciążenia sił ścinających do 2900 N i krzyżowych do ok. 1100 N zarówno przed, jak i po procesie lakierowania.

EN

The flow drill joining concept (FDJ) allows the load adjusted joining of continuous fiber reinforced thermoplastics (FRTP) and metallic sheets without auxiliary joining elements. As there is no scathe done to the fiber reinforcement, a radial realignment of the fibers leads to high-strength joints with high lightweight potential. In terms of their use in automotive lightweight construction, an important requirement for joining technologies is the resistance to temperature loads and chemicals, applied in the production processes, e.g., in vehicle lacquering. Therefore, force flux aligned FDJ-joints were investigated in cross tension and shear testings, after passing through a serial cathodic dip painting (CDP) process. The results show that the CDP-treatment does not adversely affect the quasi-static properties of the tested FDJ-joints, as they resist shear loads up to 2900 N and cross tension loads of about 1100 N, both, before and after the lacquering process.

2

Processing and characterization of cathodic dip coated metal/composite-laminates

Gerstenberger C., Osiecki T., Kroll L., Scholz P., Seidlitz H.

Archives of Civil and Mechanical Engineering

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2016

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Vol. 16, no. 3

467--472

EN

The current trend shows an increasing demand for novel technologies, that facilitate a functional integration of fiber reinforced polymers (FRP) in metal based structures, especially in automotive industry. To comply with the requirements of large-scale production the use of fiber reinforced thermoplastics in form of hybrid metal/composite-laminates seems advantageous. By targeted exploitation of their high lightweight potential, combined with suitable capabilities for mass production and good damping properties, cost-effective and weight-optimized parts with high stiffness and load capacity can be provided for future applications. As there is little known about the processing and the mechanical properties of thermoplastic based FRP/metal-laminates, the study focuses on the development of novel hybrid laminates with low residual stresses, made of metallic steel sheets and continuous glass or carbon fiber reinforced polyamide 6. In this context, the influence of several pre-operations like sand blasting, cleaning or primer application on the interlaminar shear strength (ILSS) was examined in addition to their resistance to cathodic dip paint treatment.

3

Metal/Composite Hybrids for Lightweight Applications

Osiecki T., Gerstenberger C., Hackert A., Czech A., Nossol P., Łagoda T., Niesłony A., Kroll L.

Machine Dynamics Research

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2015

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Vol. 39, No. 4

117-123

EN

Increasing mechanical, economic and environmental requirements lead to multi material designs, wherein different classes of materials and manufacturing processes are merged to realize lightweight components with a high level of functional integration. Due to the good specific characteristics and its suitability for mass production, the use of continuous fiber reinforced thermoplastics in conjunction with isotropic materials, such as steel or aluminum, offers advantages for lightweight components. Therefore, the aim of the present article was the development of innovative hybrid laminates with low residual stresses, made of steel sheets/foils and thermoplastic carbon fiber reinforced polyamide 6. Mechanical properties were examined in three point bending tests to obtain the Young's modulus as well as the flexural stress and flexural strain of the novel material.