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Pozycja Development of sensor design for smart kinesiotape for future sensing applications in motion capturing(Wydawnictwo Politechniki Łódzkiej, 2022) Winger, Hans; Böhnke, Philippa Ruth Christine; Kruppke, Iris; Nocke, Andreas; Cherif, ChokriThe “CENTRE FOR TACTILE INTERNET WITH HUMAN-IN-THE-LOOP (CeTI)” is a Cluster of Exellence that, from an textile point of view, deals with the development and invention concerning smart devices [1]. These can be used in many fields e.g. industry 4.0, medicine and skill leaning. Currently expensive, tender and large, stationary camera systems are necessary to capture human motions for various applications. The usage of textile substrates with implemented sensory units gives high potential for body-near motion capturing. Smart textiles gain more and more interest in the field of sports [2] and health monitoring. The avoidance of personal injuries due to the incorrect execution of movements is one main target to reach with smart textiles in healthcare and sports. The aim of the contribution is the investigation of characteristics using electrically conductive (EC) yarns implemented in woven textiles as future smart textiles for close up motion capturing.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, ChokriIn 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 In-situ stress analysis of fiber reinforced plastics under bending load until failure by using integrated textile-based piezoresistive sensors(Wydawnictwo Politechniki Łódzkiej, 2022) Xuan, Hung Le; Nocke, Andreas; Cherif, ChokriThe application of fiber reinforced composites (FRC) for load-bearing and safety-relevant components requires regular inspections to assess the structural conditions. A suitable solution are integrated textilebased piezoresisitive sensors for structural health monitoring applications. This research work focusses on the evaluation and comparison of the electromechanical strain sensing behaviour of steel wires and carbon fibers on the fiber and composite scale. The electromechanical properties are investigated by using a uniaxial fiber tensile test with a simultaneous electrical resistance measurement. Glass fiber reinforced plastic (GFRP) specimen with in-situ sensors are tested in quasistatic and cyclic three-point bending tests. The acquired sensor signals are used for a comprehensive stress analysis and better understanding of the failure behaviour. The cyclic testing procedure showed reproducible sensor signals.Pozycja Analysis of the local yarn elongation states during the highly dynamic stitch formation process using the example of high performance warp knitting(Wydawnictwo Politechniki Łódzkiej, 2022) Bruns, Mathis; Nocke, Andreas; Golla, Anke; Cherif, ChokriMost textile processing methods are dominated by highly inconstant and dynamic thread demands. In terms of increasing production speeds in textile industry or the effort not to influence the fabric appearance by machine stops etc., an effective control and parameterization of the machine is indispensable. This requires precise knowledge of the actual condition of the thread during processing. The state of the warp yarn sheet depends, for example, on the current yarn tension or elongation. While the yarn tension can be easily measured with mobile yarn tension meters, the actual elongation of the yarns is more difficult to observe in the highly dynamic process. Since high-speed warp knitting is one of the most dynamic textile production processes, an observation of the actual elongation states of the yarns to be processed during warp knitting is performed using highspeed optical image acquisition and image recognition algorithms. These experiments and the results are presented in this paper.Pozycja Development of test method for the characterization of electrically conductive yarns for integration in smart textiles(Wydawnictwo Politechniki Łódzkiej, 2022) Warncke, Mareen; Böhnke, Philippa Ruth Christine; Gracova, Andrea; Nocke, Andreas; Cherif, ChokriThe Cluster of Excellence “CENTRE FOR TACTILE INTERNET WITH HUMAN-IN-THE-LOOP (CeTI)” [1] deals with developments and inventions concerning smart devices used in many fields, e.g. medicine and skill learning. For the integration or electrical interconnection of smart components, electrically conductive materials are often integrated into the clothing. To maintain the flexible, textile character of such smart textiles, polymer-based yarns with a metallized coating are mostly used for this purpose. In order to be able to use these yarns both in everyday life situations and in personal protective equipment with high safety requirements, it is necessary to specifically characterize and evaluate the long-term stability of the materials used. Knowledge of the electrical properties under the influence of temperature and moisture is particularly important for clothing worn close to the body, since the stress on the materials due to body and skin temperatures and user perspiration is particularly high here. At present, it is only partly possible to characterize the electrical stability of textile conductors under different application-related climatic conditions using standardized test methods. For this reason, this paper presents a newly developed measurement and test method that makes it possible to evaluate the electrical properties of yarns under defined temperature and humidity influences over a specified period of time. On the basis of different tests, the results of which are also discussed here, the measurement accuracy and repeatability of the method can be proven.Pozycja Modelling the eddy current testing process of carbon fibre textiles(Wydawnictwo Politechniki Łódzkiej, 2022) Mersch, Johannes; Koenigsdorff, Markus; Nocke, Andreas; Cherif, ChokriCarbon 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.