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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

2016

Vol. 16, no. 3

467--472

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.

Development of novel piezoceramic actuator modules for the embedding in intelligent lightweight structures

Hufenbach W., Gude M., Modler N., Kirvel C.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

390-396

Purpose: Piezoceramic actuators in lightweight structures enable a purposeful manipulation of the dynamic and vibroacoustic structural behaviour. Above it, further studies focus on the application of thin and flexible piezoceramic modules as power sources in morphing structures aiming at a shape adaptation. Design/methodology/approach: A specific example of novel morphing structures is introduced, which rely on multistable deformation phenomena of fibre-reinforced composites with an unsymmetric lay-up. For the large-scale capable utilisation of such active structural parts made of fibre-reinforced thermoplastic composites, novel piezoceramic modules, which are specifically tailored to the structural material, and required manufacturing methods are developed. Findings: The piezoceramic modules with the highly regarded compatibility to thermoplastic composites permit their substantially coherent and homogeneous integration in the fibre composite structure without intricate adhesive assembly effort. Furthermore, thermally induced residual compressive stresses during the manufacturing process serve for purposefully prestressing the piezoceramic components to reduce the module's sensitivity to tensile loading. Research limitations/implications: For the manufacture of those novel piezoceramic modules, a continuously operating fabrication method has been developed. By the process-related integration of a hot press, residual compression stresses are thermally induced into the modules that considerably contribute to the decrease of the piezoceramic module's sensitivity to tension. Originality/value: The successful development of the novel TPM offers a significant advancement in the efficiency within the large scale production of novel intelligent lightweight structures.