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  • 1
    Online-Ressource
    Online-Ressource
    Monitoring the Structural Health of Glass Fibre-Reinforced Hybrid Laminates Using Novel Piezoceramic Film
    MDPI AG ; 2020
    In:  Sensors Vol. 20, No. 18 ( 2020-09-22), p. 5428-
    Details
    In: Sensors, MDPI AG, Vol. 20, No. 18 ( 2020-09-22), p. 5428-
    Kurzfassung: This work investigates a new generation structural health monitoring (SHM) system for fibre metal laminates (FML) based on an embedded thermoplastic film with compounded piezoceramics, termed piezo-active fibre metal laminate (PFML). The PFML is manufactured using near-series processes and its potential as a passive SHM system is being investigated. A commercial Polyvinylidene fluoride (PVDF) sensor film is used for comparative evaluation of the sensor signals. Furthermore, thermoset and thermoplastic-based FML are equipped with the sensor films and evaluated. For this purpose, static and dynamic three-point bending tests are carried out and the data are recorded. The data obtained from the sensors and the testing machine are compared with the type and time of damage by means of intelligent signal processing. By using a smart sensor system, further investigations are planned which the differentiation between various failure modes, e.g., delamination or fibre breakage.
    Materialart: Online-Ressource
    ISSN: 1424-8220
    URL: Article
    DOI: 10.3390/s20185428
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2052857-7
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  • 2
    Online-Ressource
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    Hybrid Laminate for Haptic Input Device with Integrated Signal Processing
    MDPI AG ; 2018
    In:  Applied Sciences Vol. 8, No. 8 ( 2018-07-31), p. 1261-
    Details
    In: Applied Sciences, MDPI AG, Vol. 8, No. 8 ( 2018-07-31), p. 1261-
    Kurzfassung: Achieving lightweight construction through only material substitution does not realize the full potential of producing a lightweight material, hence, it is no longer sufficient. Weight-saving goals are best achieved through additional function integration. In order to implement this premise for mass production, a manufacturing process for joining and forming hybrid laminates using a new tool concept is presented. All materials used are widely producible and processable. The manufactured cover of an automotive center console serves to demonstrate a human interface device with impact detection and action execution. This is only possible through a machine learning system, which is implemented on a small—and thus space- and energy-saving—embedded system. The measurement results confirm the objective and show that localization was sufficiently accurate.
    Materialart: Online-Ressource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app8081261
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2018
    ZDB Id: 2704225-X
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  • 3
    Online-Ressource
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    Haptic input devices with intelligent signal processing ensuring process stability and quality management
    Chemnitz University of Technology ; 2020
    In:  Technologies for Lightweight Structures (TLS) Vol. 3, No. 1 ( 2020-01-24), p. 9-16
    Details
    In: Technologies for Lightweight Structures (TLS), Chemnitz University of Technology, Vol. 3, No. 1 ( 2020-01-24), p. 9-16
    Kurzfassung: As part of the Cluster of Excellence Merge, a complete process chain was developed for the production of a hybrid laminate with sensory function for continuous production processes. An interior surface of the VW UP! is a good example of this. In this work, the forming processes of the centre console and the parameters influencing quality are discussed. An important parameter for the polarisation of the sensor layer is the thickness of the piezoceramic foil after forming. The maximum signal quality can only be achieved by an exact prediction of the thinning of the foil during the forming process. In addition, the electrical characterisation, especially the capacitance, of the sensor areas is used to determine the foil thickness within the sensor areas in the complex-shaped centre console. Furthermore, a practicable polarisation strategy is deducted in consideration of thickness, electrical characteristics of the piezoceramic foil and process parameters of forming process. For evaluation a novel impact localisation method based on machine learning is shown. Special focus is put on the independence of the impact intensity in order to guarantee a user-independent operation. In this respect, the suitability of various intensity-independent localisation methods will be discussed and subsequently empirically evaluated.
    Materialart: Online-Ressource
    ISSN: 2512-4587
    URL: Article
    DOI: 10.21935/tls.v3i1.121
    Sprache: Unbekannt
    Verlag: Chemnitz University of Technology
    Publikationsdatum: 2020
    ZDB Id: 2889893-X
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  • 4
    Online-Ressource
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    Continuous Manufacturing of Piezoceramic Hybrid Laminates for Functionalised Formed Structural Components
    Chemnitz University of Technology ; 2017
    In:  Technologies for Lightweight Structures (TLS) Vol. 1, No. 1 ( 2017-04-11)
    Details
    In: Technologies for Lightweight Structures (TLS), Chemnitz University of Technology, Vol. 1, No. 1 ( 2017-04-11)
    Kurzfassung: While in general manufacturing and functional integration are separated steps, in this article a continuous mass-production enabled procedure is discussed. The essential component of the manufactured laminate is a functionalised thermoplastic film that is combined with piezoceramic powder (lead zirconate titanate - PZT) and carbon nanotubes (CNT). The challenge is to achieve optimal electrical and electromechanical properties and a good processability while simultaneously preserving the high toughness of the composite and the required adhesive strength with the joined metal sheet. Determining the optimal joining and surface treatment parameters by identifying the interlaminar shear strength between the metal and plastic components allows for a continuous rolling production process with a subsequent roll forming process. Further investigations on the forming properties are concerned with the optimal placement of the sensors as well as the arrangement and shape of the electrodes. A neural network approach is evaluated to facilitate detection and localisation of external forces in order to use such functional hybrid laminates for new operating concepts in the interior of motor vehicles or for structural health monitoring.
    Materialart: Online-Ressource
    ISSN: 2512-4587
    URL: Article
    DOI: 10.21935/tls.v1i1.64
    Sprache: Unbekannt
    Verlag: Chemnitz University of Technology
    Publikationsdatum: 2017
    ZDB Id: 2889893-X
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  • 5
    Online-Ressource
    Online-Ressource
    Functionalized Compounds for Micro‐Injection Molded Piezo Modules (μIMP‐Modules) and Their Electrical Contacting
    Wiley ; 2018
    In:  Advanced Engineering Materials Vol. 20, No. 12 ( 2018-12)
    Details
    In: Advanced Engineering Materials, Wiley, Vol. 20, No. 12 ( 2018-12)
    Kurzfassung: Multi‐component micro‐injection molding enables the manufacturing of active elements as well as electrical contacting in situ and in a single process by using piezo active and electroconductive plastic compounds. Each compound is functionalized with filler materials according to its special demands. To this end, polypropylene (PP) with an electromechanical active filler based on piezoceramic powder (PZT: Lead zirconate titanate) for sensor functionality as well as PP with electroconductive properties based on carbon nanotubes (CNT) and carbon black (CB) for electrical contacting are investigated. Therefore, different compound compositions are analyzed with regard to their mechanical and electrical properties as well as their mechanical compatibility. For the analyses, micro injection molded samples of the different compounds are used. Furthermore, investigations on composite strength are conducted by measuring interlaminar shear strength between the functionalized compounds. Based on the material characterization, a simulation of the thermomechanical behavior is done and the process‐related residual stresses are analyzed. To achieve the prerequisites for fabricating sensor modules in mass production, the functionalized compounds should be processed by means of the two‐component micro‐injection molding technology. According to this, the objective target is a large‐scale integration of these piezo modules into multifunctional lightweight structures. Therefore, the modules are combined with electrically functionalized textile substrates creating semi‐finished products with sensor functionalities. The mechanical and electrical connections are created by ultrasonic welding. Applying this technology requires a manufacturing study with varying process parameters of joining force, amplitude and welding time with the aim of achieving minimal electrical contact resistance.
    Materialart: Online-Ressource
    ISSN: 1438-1656 , 1527-2648
    URL: Issue
    URL: Article
    DOI: 10.1002/adem.v20.12
    DOI: 10.1002/adem.201800442
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2018
    ZDB Id: 2016980-2
    ZDB Id: 1496512-4
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    In-Line Integration of Sensors in Thermoplastic Composite Structures Using Novel Continuous Orbital Winding Technology
    Trans Tech Publications, Ltd. ; 2017
    In:  Key Engineering Materials Vol. 742 ( 2017-7), p. 490-497
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 742 ( 2017-7), p. 490-497
    Kurzfassung: Currently there is a great demand for energy and resource efficient and also function integrating manufacturing processes. Therefore, suitable technologies and corresponding foundational researches are being pursued in the federal cluster of excellence “MERGE Technologies for Multifunctional Lightweight Structures” at the Technische Universität Chemnitz. A part of this project is the development of the continuous orbital winding (COW) technology including the goal of a large-scale process used for special fiber-reinforced thermoplastic semi-finished products. This method is an inverted winding process. The winding core needs to perform only the feed motion. Furthermore, this allows synchronization to upstream and downstream process chains.Due to the modular structure of the machine concept, it is possible to integrate a sensor system during production without interrupting the process. For this purpose, a textile carrier tape with integrated electrically conductive fibers and applied sensors is embedded. Various silicon sensors, e.g. acceleration, pressure or stress sensors are applied by micro-injection molding. A so-called “interposer” is used as an electrically adapter between the microstructures of the sensor system and the mesostructures of the textile.In this article, basic investigations for the continuous processing of semi-finished thermoplastic structures and the integration of sensors are presented. It is intended to determine the bonding properties, possible structural thickening by the sensors and the resistance of the sensor systems and its electronic components to the process conditions.In summary, investigations are carried out to determine the parameters of the machine system as well as to determine the optimum processing conditions for the application of additional elements.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.742
    DOI: 10.4028/www.scientific.net/KEM.742.490
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2017
    ZDB Id: 2073306-9
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  • 7
    Online-Ressource
    Online-Ressource
    Reflection based Strain Sensing using Metamaterials
    Chemnitz University of Technology ; 2020
    In:  Technologies for Lightweight Structures (TLS) Vol. 3, No. 1 ( 2020-02-10), p. 25-33
    Details
    In: Technologies for Lightweight Structures (TLS), Chemnitz University of Technology, Vol. 3, No. 1 ( 2020-02-10), p. 25-33
    Kurzfassung: Resonator arrays of periodicially arranged electromagnetic sub-wavelength resonators show a strong frequency filter behaviour which can be controlled by the geometry, size and arrangement of the resonators. The use of several resonator arrays and their integration into a polymer matrix allows the realisation of metamaterials with a specific resonance behaviour. The resonance behaviour can be influenced by material and structural changes enabling a passive sensor function. The considered sensor approach based on metamaterials is investigated to enable structural health monitoring of lightweight structures. In the present case, a double-layer Jerusalem cross (JC) resonator array (RA) is integrated into a glass fibre reinforced plastic (GFRP) to analyse the change of the resonance behaviour under load (strain) using a reflection measurement. The CST (Computer Simulation Technology) Microwave Studio was used to model the resonator array for operation in the microwave frequency range between 15 GHz and 35 GHz as well as for the numerical analysis of the resonance behaviour under load. The numerical results were validated by a tensile test using a tensile test machine (type TIRATEST 28100, Tira GmbH) and by a reflection measurement using two standard gain horn antennas (type Standard Gain Horn Series 862, ARRA Inc) and a vector network analyser (type ZVA50, Rohde & Schwarz). The reflection measurement shows a reflection minimum at 28.6 GHz which moves to higher frequencies under load of the GFRP laminate. With the shift of the minimum, the quality factor decreases and the dip widens. The investigation shows that it is possible to provide a GFRP laminate with a specific electromagnetic behaviour by integrating resonator arrays. It is also shown that the specific electromagnetic behaviour can be influenced by structural changes and thus opens up the possibility of monitoring the condition of lightweight structures.
    Materialart: Online-Ressource
    ISSN: 2512-4587
    URL: Article
    DOI: 10.21935/tls.v3i1.125
    Sprache: Unbekannt
    Verlag: Chemnitz University of Technology
    Publikationsdatum: 2020
    ZDB Id: 2889893-X
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  • 8
    Online-Ressource
    Online-Ressource
    Technologies for the integration of miniaturised silicon sensor systems in fibre-reinforced composites
    Chemnitz University of Technology ; 2019
    In:  Technologies for Lightweight Structures (TLS) Vol. 1, No. 2 ( 2019-01-09)
    Details
    In: Technologies for Lightweight Structures (TLS), Chemnitz University of Technology, Vol. 1, No. 2 ( 2019-01-09)
    Kurzfassung: Functional integration processes gain more and more importance in lightweight engineering. In this paper we discuss how to improve fibre-reinforced composites with structurally integrated condition monitoring systems, suitable for predicting failure behaviour. Especially commercially available and tested silicon sensors, but also new developments are well-suited for this intention. We present a smart semi-finished textile with integrated silicon sensors for in-situ conditions and process monitoring in fibre-reinforced composites. It consists of a textile substrate tape with integrated electrically conductive fibres and various silicon sensors, applied by micro-injection moulding. A so-called “interposer” is used as an electrical adapter between the microstructures of the sensor system and the mesostructures of the textile. The key technology used for the encapsulation and electrical contacting of the sensor nodes is a two-stage two-component micro injection moulding process, allowing for a cost efficient and application specific mass production. As proof of concept we chose the injection moulding process to investigate the influence of the fabrication process on all electronic components with a silicon stress measurement chip. We performed in-situ measurements of temperature and in-plane mechanical stress for different glass fibre contents of the PA6 melt and tool temperatures and compared the results with a finite element simulation.
    Materialart: Online-Ressource
    ISSN: 2512-4587
    URL: Article
    DOI: 10.21935/tls.v1i2.82
    Sprache: Unbekannt
    Verlag: Chemnitz University of Technology
    Publikationsdatum: 2019
    ZDB Id: 2889893-X
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  • 9
    Online-Ressource
    Online-Ressource
    Effect of acoustic excitation on fiber-reinforced polypropylene and the influence on melt viscosity
    Springer Science and Business Media LLC ; 2021
    In:  The International Journal of Advanced Manufacturing Technology Vol. 117, No. 7-8 ( 2021-12), p. 2395-2403
    Details
    In: The International Journal of Advanced Manufacturing Technology, Springer Science and Business Media LLC, Vol. 117, No. 7-8 ( 2021-12), p. 2395-2403
    Kurzfassung: The paper describes a novel technological approach to influencing the rheological properties of thermoplastic materials exposed to acoustic energy. The flow behavior of polypropylene with different mass percentages of glass fibers is investigated in a parallel plate rheometer under high-frequency longitudinal excitation. The influence of oscillation frequency on the melt viscosity is explained by means of shear thinning criteria. The dependence of the oscillation shape using sinusoidal excitation on shear thinning as a function of different fiber reinforcement percentages is also investigated. A phenomenological view describes the mutually influencing parameters with regard to different material compositions and different excitation frequencies over the time course of the rheometric measurement. Interacting relationships are analyzed and discussed and the potential of the actuator system to influence the plastic melt is worked out. Based on this, a technological approach follows which describes the transfer of an oscillating mold surface to plastics processing methods, which, especially in the case of energy-intensive injection molding technology, leads to the expectation of possible resource efficiency in energy and material.
    Materialart: Online-Ressource
    ISSN: 0268-3768 , 1433-3015
    URL: Article
    DOI: 10.1007/s00170-021-07158-4
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2021
    ZDB Id: 52651-4
    ZDB Id: 1476510-X
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  • 10
    Online-Ressource
    Online-Ressource
    Development of hybrid assembled composites with sensory function
    Elsevier BV ; 2015
    In:  CIRP Annals Vol. 64, No. 1 ( 2015), p. 25-28
    Details
    In: CIRP Annals, Elsevier BV, Vol. 64, No. 1 ( 2015), p. 25-28
    Materialart: Online-Ressource
    ISSN: 0007-8506
    URL: Article
    DOI: 10.1016/j.cirp.2015.04.054
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2015
    ZDB Id: 2158646-9
    ZDB Id: 194122-7
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