Przeglądaj {{ collection }} wg Autor "Mersch, Johannes"

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  • Pozycja
    Development of integrated in-Situ actuator networks for the realization of flexure hinges for highly deformable fiber-reinforced plastic composites
    (Wydawnictwo Politechniki Łódzkiej, 2022) Bollengier, Quentin; Rabe, David; Mersch, Johannes; Häntzsche, Eric; Nocke, Andreas; Cherif, Chokri
    In the course of promoting e-mobility, there is currently a high demand for functionalized fiberreinforced plastics (FRPs). In particular, adaptive FRPs with structurally integrated actuators have a high innovation potential, since conventional motion mechanisms are usually based on external kinematics with high energy consumption. Even though actuators based on shape memory alloy (SMA) can be easily processed by mean of textile techniques, only few studies use the weft-knitting technology for the realization of adaptive FRPs with integrated actuator networks. This study aims at the development of functionalized weft-knitted fabrics with integrated in-situ actuator networks for the realization of adaptive FRPs. Therefore, functionalized reinforcement fabrics with integrated SMA actuators were developed and produced by weft knitting. The production of the composite infused by means of a thermosetting resin system. Afterward, the functional properties of adaptive FRPs were characterized and evaluated. In summary, this study highlights the suitability of the weft-knitting technology for the integral manufacturing of functionalized reinforcement fabrics with integrated in-situ actuator networks for the realization of adaptive FRP composites.
  • Pozycja
    Modelling the eddy current testing process of carbon fibre textiles
    (Wydawnictwo Politechniki Łódzkiej, 2022) Mersch, Johannes; Koenigsdorff, Markus; Nocke, Andreas; Cherif, Chokri
    Carbon fibre textiles are a class of high performance materials that for example are used in aerospace applications. Such applications have exceptionally high requirements regarding quality and reliability of carbon fibre textiles. Eddy current testing is a non-destructive testing method, which can be applied to both pure textile as well as the cured carbon fibre reinforced composite. However, the resulting data is hard to interpret because the local anisotropic conductivity and permittivity divert the signal from one of a simple metal. Simulation can help to understand the complex current paths in the carbon fibre textile and their influence on the sensor signal. Feasible modelling strategies are discussed, implemented, and compared to experimental results of regularly occurring faults in the textile, like gaps in different depths.