@inproceedings{59683,
  abstract     = {{Woven fibre-reinforced polymers are used in a variety of application, especially where a low mass to stiffness ratio is required. Of paramount importance for the tailored mechanical properties these composite materials exhibit is the type and geometry of the fibre weave. Especially continuous fibre-reinforced thermoplastic composites are fabricated as laminates and subsequently exposed to forming processes which alter the geometry of the fibres unit cell and thus the local mechanical properties of the material. An approach utilising broadband ultrasonic waves is proposed to non-destructively determine the geometry of the unit cell of the weave.

The dispersive behaviour of woven fibre-reinforced sheets is described in accordance with the Flouquet-Bloch theorem as a phononic crystal. In order to develop a model for a description of these periodically structured waveguides, the smallest repeating unit of the wave is modelled with periodic boundary conditions. The resulting dispersion diagram exhibits similarities to that of a homogeneous plate, but additionally displays a periodicity in the wavenumber regime, which correspond with the size of the unit cell. Experimental studies of the dispersive behaviour of acoustic waves in woven fibre-reinforced samples also show a periodicity in the wavenumber regime, enabling a measurement procedure of the unit cell geometry.}},
  author       = {{Wippermann, Mareen and Claes, Leander and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Determination of the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic waves}}},
  doi          = {{10.71568/DASDAGA2025.116}},
  year         = {{2025}},
}

@inproceedings{59688,
  author       = {{Claes, Leander and Zeipert, Henning and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Assessment of Fibre-Matrix Adhesion in Reinforced Polymers by Modal Damping of Guided Acoustic Waves}}},
  doi          = {{10.71568/DASDAGA2025.052}},
  year         = {{2025}},
}

@article{63440,
  author       = {{Moritzer, Elmar and Brandes, Philipp and Westphal, Max Siegfried and Claes, Leander and Wippermann, Mareen and Düchting, Julia and Henning, Bernd}},
  journal      = {{WAK Jahresmagazin}},
  keywords     = {{Faser-Kunststoff-Verbunde (FKV), Faserverstärkte Kunststoffe (FVK), Organobleche, Ultraschall}},
  pages        = {{26–29}},
  title        = {{{ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN}}},
  volume       = {{2025}},
  year         = {{2025}},
}

@inproceedings{62295,
  author       = {{Wippermann, Mareen and Claes, Leander}},
  booktitle    = {{2025 International Congress on Ultrasonics}},
  location     = {{Paderborn}},
  pages        = {{24----27}},
  publisher    = {{AMA Service GmbH}},
  title        = {{{Phononic crystallography of fibre-reinforced polymers using broadband acoustic waves}}},
  doi          = {{10.5162/ultrasonic2025/a1-b2}},
  year         = {{2025}},
}

@inproceedings{63441,
  author       = {{Moritzer, Elmar and Brandes, Philipp and Wittler, Maurice and Claes, Leander and Wippermann, Mareen and Henning, Bernd}},
  booktitle    = {{40th International Conference of the Polymer Processing Society}},
  keywords     = {{Faser-Kunststoff-Verbunde (FKV), Faserverstärkte Kunststoffe (FVK), Organobleche, Ultraschall}},
  title        = {{{Non-destructive fiber-matrix adhesion measurement of glass fiber reinforced thermoplastic composite laminates using ultrasound}}},
  year         = {{2025}},
}

@inproceedings{53823,
  author       = {{Claes, Leander}},
  booktitle    = {{Fortschritte der Akustik - DAGA 2024}},
  editor       = {{Gesellschaft für Akustik e.V., Deutsche}},
  pages        = {{620–623}},
  title        = {{{Einfluss der periodischen Struktur auf geführte Wellen in gewebeverstärkten Polymeren}}},
  year         = {{2024}},
}

@inproceedings{54786,
  author       = {{Claes, Leander and Hetkämper, Tim and Zeipert, Henning and Henning, Bernd}},
  booktitle    = {{22. GMA/ITG-Fachtagung – Sensoren und Messsysteme 2024}},
  isbn         = {{978-3-910600-01-0}},
  pages        = {{300–305}},
  publisher    = {{VDE Verlag GmbH}},
  title        = {{{Auswertung der modalen Dämpfung von geführten akustischen Wellen in faserverstärkten Kunststoffplatten}}},
  doi          = {{10.5162/sensoren2024/D1.2}},
  year         = {{2024}},
}

@misc{55302,
  author       = {{Claes, Leander and Wippermann, Mareen}},
  title        = {{{Analysis of guided acoustic waves in periodically structured plates}}},
  year         = {{2024}},
}

@inproceedings{56836,
  author       = {{Claes, Leander and Johannesmann, Sarah and Zeipert, Henning and Henning, Bernd}},
  booktitle    = {{2023 International Congress on Ultrasonics, Beijing, China}},
  issn         = {{1742-6596}},
  pages        = {{012171}},
  publisher    = {{IOP Publishing}},
  title        = {{{Broadband acoustic waves in plate-like structures for acoustic material characterisation}}},
  doi          = {{10.1088/1742-6596/2822/1/012171}},
  volume       = {{2822}},
  year         = {{2024}},
}

@article{30863,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>In this paper a measurement procedure to identify viscoelastic material parameters of plate-like samples using broadband ultrasonic waves is presented. Ultrasonic Lamb waves are excited via the thermoelastic effect using laser radiation and detected by a piezoelectric transducer. The resulting measurement data is transformed to yield information about multiple propagating Lamb waves as well as their attenuation. These results are compared to simulation results in an inverse procedure to identify the parameters of an elastic and a viscoelastic material model.</jats:p>}},
  author       = {{Johannesmann, Sarah and Claes, Leander and Feldmann, Nadine and Zeipert, Henning and Henning, Bernd}},
  issn         = {{2196-7113}},
  journal      = {{tm - Technisches Messen}},
  keywords     = {{Electrical and Electronic Engineering, Instrumentation}},
  number       = {{7 - 8}},
  pages        = {{493 -- 506}},
  publisher    = {{Walter de Gruyter GmbH}},
  title        = {{{Lamb wave based approach to the determination of acoustic material parameters}}},
  doi          = {{10.1515/teme-2021-0134}},
  volume       = {{89}},
  year         = {{2022}},
}

@inproceedings{6588,
  author       = {{Johannesmann, Sarah and Claes, Leander and Henning, Bernd}},
  booktitle    = {{Fortschritte der Akustik - DAGA 2022}},
  location     = {{Stuttgart}},
  pages        = {{1401--1404}},
  title        = {{{Estimation of viscoelastic material parameters of polymers using Lamb waves}}},
  year         = {{2022}},
}

@misc{6560,
  author       = {{Johannesmann, Sarah}},
  title        = {{{Inverses Verfahren zur Bestimmung viskoelastischer Materialparameter}}},
  year         = {{2022}},
}